Initial commit: LoraTester Android + server

.gitignore

@@ -0,0 +1,15 @@
+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

.idea/.gitignore

@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml

.idea/AndroidProjectSystem.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="AndroidProjectSystem">
+    <option name="providerId" value="com.android.tools.idea.GradleProjectSystem" />
+  </component>
+</project>

.idea/compiler.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <bytecodeTargetLevel target="21" />
+  </component>
+</project>

.idea/deploymentTargetSelector.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="deploymentTargetSelector">
+    <selectionStates>
+      <SelectionState runConfigName="app">
+        <option name="selectionMode" value="DROPDOWN" />
+      </SelectionState>
+    </selectionStates>
+  </component>
+</project>

.idea/gradle.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GradleSettings">
+    <option name="linkedExternalProjectsSettings">
+      <GradleProjectSettings>
+        <option name="testRunner" value="CHOOSE_PER_TEST" />
+        <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="gradleJvm" value="#GRADLE_LOCAL_JAVA_HOME" />
+        <option name="modules">
+          <set>
+            <option value="$PROJECT_DIR$" />
+            <option value="$PROJECT_DIR$/app" />
+          </set>
+        </option>
+      </GradleProjectSettings>
+    </option>
+  </component>
+</project>

.idea/migrations.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectMigrations">
+    <option name="MigrateToGradleLocalJavaHome">
+      <set>
+        <option value="$PROJECT_DIR$" />
+      </set>
+    </option>
+  </component>
+</project>

.idea/misc.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="jbr-21" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/build/classes" />
+  </component>
+  <component name="ProjectType">
+    <option name="id" value="Android" />
+  </component>
+</project>

.idea/runConfigurations.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RunConfigurationProducerService">
+    <option name="ignoredProducers">
+      <set>
+        <option value="com.intellij.execution.junit.AbstractAllInDirectoryConfigurationProducer" />
+        <option value="com.intellij.execution.junit.AllInPackageConfigurationProducer" />
+        <option value="com.intellij.execution.junit.PatternConfigurationProducer" />
+        <option value="com.intellij.execution.junit.TestInClassConfigurationProducer" />
+        <option value="com.intellij.execution.junit.UniqueIdConfigurationProducer" />
+        <option value="com.intellij.execution.junit.testDiscovery.JUnitTestDiscoveryConfigurationProducer" />
+        <option value="org.jetbrains.kotlin.idea.junit.KotlinJUnitRunConfigurationProducer" />
+        <option value="org.jetbrains.kotlin.idea.junit.KotlinPatternConfigurationProducer" />
+      </set>
+    </option>
+  </component>
+</project>

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

Jenkinsfile

@@ -7,10 +7,8 @@ pipeline {
         ANDROID_SDK_ROOT = '/opt/android-sdk'
         PATH = "/usr/lib/jvm/java-21-openjdk-amd64/bin:/opt/android-sdk/cmdline-tools/latest/bin:/opt/android-sdk/platform-tools:${env.PATH}"
 
-        TAIGA_PROJECT_ID = '2'
-        TAIGA_URL = 'https://taiga.grigowashere.ru'
         GITEA_OWNER = 'Grigo'
-        GITEA_REPO = 'TestingAndroidBuild' // Замените на нужный репозиторий
+        GITEA_REPO = 'LoraMapTester' // Замените на нужный репозиторий
         GITEA_URL = 'https://git.grigowashere.ru' // Базовый URL Gitea
         GITEA_API_URL = "${GITEA_URL}/api/v1"
         GITEA_TOKEN_CREDENTIALS_ID = 'Gitea_Credentials' // ID ваших креденшлов для Gitea в Jenkins
@@ -40,7 +38,11 @@ pipeline {
                     writeFile file: 'gitea-release.sh', text: '''
 #!/bin/bash
 
-apkPath="build/outputs/apk/debug/app-debug.apk"
+apkPath=$(find . -path '*/build/outputs/apk/debug/*.apk' -type f | head -1)
+if [ -z "$apkPath" ]; then
+  echo "APK not found under */build/outputs/apk/debug/"
+  exit 1
+fi
 headers="Authorization: token $GITEA_TOKEN"
 
 # Создаем релиз на Gitea
@@ -80,98 +82,4 @@ fi
             }
         }
     }
-
-    post {
-        always {
-            script {
-                def result = currentBuild.currentResult ?: 'UNKNOWN'
-
-                withCredentials([string(credentialsId: 'TAIGA_TOKEN', variable: 'TAIGA_TOKEN')]) {
-                    sh(returnStatus: true, script: """
-                        set +e
-
-                        REF=\$(git log -1 --pretty=%B | grep -oE 'TG-[0-9]+' | head -1 | cut -d- -f2 || true)
-
-                        if [ -z "\$REF" ]; then
-                          echo "No TG-* reference found"
-                          exit 0
-                        fi
-
-                        export REF
-                        export BUILD_RESULT="${result}"
-
-                        python3 - <<'PY'
-import json
-import os
-import urllib.request
-
-taiga_url = os.environ["TAIGA_URL"]
-project_id = os.environ["TAIGA_PROJECT_ID"]
-token = os.environ["TAIGA_TOKEN"]
-ref = os.environ["REF"]
-
-headers = {
-    "Authorization": f"Bearer {token}",
-    "Content-Type": "application/json",
-}
-
-def get_json(path):
-    url = f"{taiga_url}{path}"
-    req = urllib.request.Request(url, headers=headers)
-    try:
-        with urllib.request.urlopen(req) as r:
-            return json.loads(r.read().decode("utf-8"))
-    except Exception:
-        return None
-
-targets = [
-    ("userstories", "User Story"),
-    ("issues", "Issue"),
-    ("tasks", "Task"),
-]
-
-found = None
-
-for endpoint, label in targets:
-    data = get_json(f"/api/v1/{endpoint}/by_ref?project={project_id}&ref={ref}")
-    if data and "id" in data:
-        found = (endpoint, label, data)
-        break
-
-if not found:
-    print(f"Taiga TG-{ref} not found")
-    raise SystemExit(0)
-
-endpoint, label, data = found
-
-comment = (
-    f"Jenkins Android build #{os.environ['BUILD_NUMBER']}: {os.environ['BUILD_RESULT']}\\n"
-    f"{os.environ['BUILD_URL']}"
-)
-
-payload = json.dumps({
-    "comment": comment,
-    "version": data["version"],
-}).encode("utf-8")
-
-url = f"{taiga_url}/api/v1/{endpoint}/{data['id']}"
-req = urllib.request.Request(
-    url,
-    data=payload,
-    headers=headers,
-    method="PATCH",
-)
-
-try:
-    with urllib.request.urlopen(req) as r:
-        print(f"Commented Taiga TG-{ref} ({label}), HTTP {r.status}")
-except Exception as e:
-    print(f"Taiga comment warning: {e}")
-    raise SystemExit(0)
-PY
-                    """.stripIndent())
-                }
-            }
-        }
-    }
 }

README.md

@@ -0,0 +1,24 @@
+# LoraTester
+
+Android-клиент и Python-сервер для мониторинга LoRa приёмопередатчика (telnet → парсинг кадров), GPS-позиций, карты и чата между устройствами.
+
+## Компоненты
+
+- **Android** (`app/`) — telnet на `127.0.0.1:2727`, AT-команды (AT+H, AT+TX, …), отправка телеметрии на сервер, карта OSMDroid, чат, настройки.
+- **Server** (`server/`) — Flask (основной) + FastAPI, веб-карта Leaflet, REST API. См. [server/README.md](server/README.md).
+
+## Быстрый старт
+
+1. Запустите сервер: `cd server && pip install -r requirements.txt && python flask_app.py`
+2. Соберите APK в Android Studio или `./gradlew assembleDebug`
+3. В приложении: Настройки → URL `http://<ваш-сервер>:7634`, включите telnet при наличии моста COM→telnet
+
+## Тесты
+
+```bash
+./gradlew test
+```
+
+Симуляция телнет-кадра: вкладка **Статистика** → «Симуляция телнет-кадра».
+
+AT-команды: вкладка **AT** — быстрые кнопки и произвольная строка (добавляются префикс `AT` и `\r\n`). Нужен включённый telnet в **Настройках**.

app/.gitignore

@@ -0,0 +1 @@
+/build

app/build.gradle.kts

@@ -0,0 +1,57 @@
+plugins {
+    alias(libs.plugins.android.application)
+}
+
+android {
+    namespace = "com.grigowashere.loratester"
+    compileSdk = 35
+
+    defaultConfig {
+        applicationId = "com.grigowashere.loratester"
+        minSdk = 30
+        targetSdk = 35
+        versionCode = 1
+        versionName = "1.0"
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
+        }
+    }
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+}
+
+dependencies {
+
+    implementation(libs.appcompat)
+    implementation(libs.material)
+    implementation(libs.activity)
+    implementation(libs.constraintlayout)
+    implementation(libs.okhttp)
+    implementation(libs.gson)
+    implementation(libs.play.services.location)
+    implementation(libs.mapsforge.core)
+    implementation(libs.mapsforge.map)
+    implementation(libs.mapsforge.map.android)
+    implementation(libs.mapsforge.map.reader)
+    implementation(libs.mapsforge.themes)
+    implementation(libs.viewpager2)
+    implementation(libs.fragment)
+    implementation(libs.recyclerview)
+    testImplementation(libs.junit)
+    testImplementation(libs.okhttp)
+    testImplementation(libs.gson)
+    testImplementation(libs.mockwebserver)
+    androidTestImplementation(libs.ext.junit)
+    androidTestImplementation(libs.espresso.core)
+}

app/proguard-rules.pro

@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

app/src/androidTest/java/com/grigowashere/loratester/ExampleInstrumentedTest.java

@@ -0,0 +1,26 @@
+package com.grigowashere.loratester;
+
+import android.content.Context;
+
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+        assertEquals("com.grigowashere.loratester", appContext.getPackageName());
+    }
+}

app/src/main/AndroidManifest.xml

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
+    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
+    <uses-permission android:name="android.permission.VIBRATE" />
+
+    <application
+        android:name=".LoraApp"
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:networkSecurityConfig="@xml/network_security_config"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.LoraTester"
+        tools:targetApi="31">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:windowSoftInputMode="adjustResize">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

app/src/main/java/com/grigowashere/loratester/CommandPoller.java

@@ -0,0 +1,257 @@
+package com.grigowashere.loratester;
+
+import android.os.Handler;
+import android.os.Looper;
+import android.util.Log;
+
+import com.grigowashere.loratester.api.DeviceCommand;
+import com.grigowashere.loratester.api.PairedTrackSession;
+import com.grigowashere.loratester.api.ServerApi;
+import com.grigowashere.loratester.telnet.AtCommands;
+import com.grigowashere.loratester.telnet.TelnetClient;
+import com.grigowashere.loratester.track.TrackRecorder;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+public class CommandPoller {
+
+    private static final String TAG = "CommandPoller";
+    private static final long COMMAND_POLL_MS = 2000;
+    private static final long PAIRED_POLL_MS = 1500;
+
+    private final ServerApi serverApi;
+    private final String deviceId;
+    private final TelemetryUploader uploader;
+    private final TrackRecorder trackRecorder;
+    private final PeerStatsCache peerStatsCache;
+    private final ExecutorService executor = Executors.newSingleThreadExecutor();
+    private final Handler mainHandler = new Handler(Looper.getMainLooper());
+    private final AtomicBoolean running = new AtomicBoolean(false);
+
+    private volatile long pendingAckSessionId = -1;
+    private volatile long startedSessionId = -1;
+
+    public CommandPoller(
+            ServerApi serverApi,
+            String deviceId,
+            TelemetryUploader uploader,
+            TrackRecorder trackRecorder,
+            PeerStatsCache peerStatsCache
+    ) {
+        this.serverApi = serverApi;
+        this.deviceId = deviceId;
+        this.uploader = uploader;
+        this.trackRecorder = trackRecorder;
+        this.peerStatsCache = peerStatsCache;
+        trackRecorder.setPairedListener(new TrackRecorder.Listener() {
+            @Override
+            public void onStateChanged(boolean recording, int pointCount, long trackId) {
+                if (recording && trackId > 0 && pendingAckSessionId > 0) {
+                    long sid = pendingAckSessionId;
+                    pendingAckSessionId = -1;
+                    executor.execute(() -> ackSession(sid, trackId));
+                }
+            }
+
+            @Override
+            public void onError(String message) {
+                Log.w(TAG, "track: " + message);
+            }
+        });
+    }
+
+    public PeerStatsCache getPeerStatsCache() {
+        return peerStatsCache;
+    }
+
+    public void start() {
+        if (!running.compareAndSet(false, true)) {
+            return;
+        }
+        scheduleCommandPoll();
+        schedulePairedPoll();
+    }
+
+    public void stop() {
+        running.set(false);
+    }
+
+    private void scheduleCommandPoll() {
+        executor.execute(() -> {
+            if (running.get()) {
+                pollCommands();
+            }
+            if (running.get()) {
+                mainHandler.postDelayed(this::scheduleCommandPoll, COMMAND_POLL_MS);
+            }
+        });
+    }
+
+    private void schedulePairedPoll() {
+        executor.execute(() -> {
+            if (running.get()) {
+                pollPairedSession();
+            }
+            if (running.get()) {
+                mainHandler.postDelayed(this::schedulePairedPoll, PAIRED_POLL_MS);
+            }
+        });
+    }
+
+    private void pollCommands() {
+        try {
+            List<DeviceCommand> cmds = serverApi.pollPendingCommands(deviceId);
+            for (DeviceCommand cmd : cmds) {
+                execute(cmd);
+            }
+        } catch (Exception e) {
+            Log.w(TAG, "command poll failed", e);
+        }
+    }
+
+    private void execute(DeviceCommand cmd) {
+        if (cmd == null || cmd.kind == null) {
+            return;
+        }
+        switch (cmd.kind) {
+            case "at" -> {
+                String line = cmd.payload != null && cmd.payload.get("line") != null
+                        ? String.valueOf(cmd.payload.get("line")) : null;
+                if (line != null) {
+                    uploader.sendAtCommand(line, r ->
+                            Log.i(TAG, "remote AT " + line + " -> " + r));
+                }
+            }
+            case "mode" -> {
+                String role = cmd.payload != null && cmd.payload.get("role") != null
+                        ? String.valueOf(cmd.payload.get("role")) : null;
+                if ("TX".equalsIgnoreCase(role)) {
+                    uploader.sendAtCommand(AtCommands.TRANSMIT, r -> {});
+                } else if ("RX".equalsIgnoreCase(role)) {
+                    uploader.sendAtCommand(AtCommands.RECEIVE, r -> {});
+                }
+            }
+            case "stats_push" -> peerStatsCache.updateFromPayload(cmd.payload);
+            default -> Log.w(TAG, "unknown kind " + cmd.kind);
+        }
+    }
+
+    private void pollPairedSession() {
+        try {
+            Map<String, Object> resp = serverApi.getActivePairedTrack();
+            Object sessionObj = resp.get("session");
+            if (!(sessionObj instanceof Map)) {
+                return;
+            }
+            @SuppressWarnings("unchecked")
+            Map<String, Object> m = (Map<String, Object>) sessionObj;
+            PairedTrackSession session = mapSession(m);
+            if (session == null) {
+                return;
+            }
+            boolean inSession = deviceId.equals(session.device_a)
+                    || deviceId.equals(session.device_b);
+            if (!inSession) {
+                return;
+            }
+            if (!session.ready || trackRecorder.isRecording()) {
+                return;
+            }
+            if (startedSessionId == session.id) {
+                return;
+            }
+            Long myTrack = deviceId.equals(session.device_a)
+                    ? session.track_id_a : session.track_id_b;
+            if (myTrack != null && myTrack > 0) {
+                startedSessionId = session.id;
+                return;
+            }
+            startedSessionId = session.id;
+            pendingAckSessionId = session.id;
+            mainHandler.post(trackRecorder::start);
+        } catch (Exception e) {
+            Log.w(TAG, "paired poll failed", e);
+        }
+    }
+
+    private void ackSession(long sessionId, long trackId) {
+        try {
+            serverApi.ackPairedTrack(sessionId, deviceId, trackId);
+            Log.i(TAG, "paired ack session=" + sessionId + " track=" + trackId);
+        } catch (Exception e) {
+            Log.e(TAG, "paired ack failed", e);
+            pendingAckSessionId = sessionId;
+        }
+    }
+
+    private static PairedTrackSession mapSession(Map<String, Object> m) {
+        if (m == null) {
+            return null;
+        }
+        PairedTrackSession s = new PairedTrackSession();
+        Object id = m.get("id");
+        if (id instanceof Number) {
+            s.id = ((Number) id).longValue();
+        }
+        s.device_a = str(m.get("device_a"));
+        s.device_b = str(m.get("device_b"));
+        s.initiator = str(m.get("initiator"));
+        s.status = str(m.get("status"));
+        s.start_at = num(m.get("start_at"));
+        s.created_at = num(m.get("created_at"));
+        s.server_time = num(m.get("server_time"));
+        Object ready = m.get("ready");
+        s.ready = ready instanceof Boolean && (Boolean) ready;
+        s.track_id_a = longOrNull(m.get("track_id_a"));
+        s.track_id_b = longOrNull(m.get("track_id_b"));
+        return s;
+    }
+
+    private static String str(Object o) {
+        return o != null ? String.valueOf(o) : null;
+    }
+
+    private static double num(Object o) {
+        return o instanceof Number ? ((Number) o).doubleValue() : 0;
+    }
+
+    private static Long longOrNull(Object o) {
+        return o instanceof Number ? ((Number) o).longValue() : null;
+    }
+
+    public void postCommandToPeer(String peerId, String kind, Map<String, Object> payload) {
+        executor.execute(() -> {
+            try {
+                serverApi.postCommand(deviceId, peerId, kind, payload);
+            } catch (Exception e) {
+                Log.e(TAG, "post command failed", e);
+            }
+        });
+    }
+
+    public void startPairedTrack(Runnable onDone, java.util.function.Consumer<String> onError) {
+        executor.execute(() -> {
+            try {
+                Map<String, Object> body = new HashMap<>();
+                body.put("device_id", deviceId);
+                serverApi.startPairedTrack(body);
+                startedSessionId = -1;
+                pendingAckSessionId = -1;
+                if (onDone != null) {
+                    mainHandler.post(onDone);
+                }
+            } catch (Exception e) {
+                Log.e(TAG, "start paired failed", e);
+                if (onError != null) {
+                    mainHandler.post(() -> onError.accept(
+                            e.getMessage() != null ? e.getMessage() : "error"));
+                }
+            }
+        });
+    }
+}

app/src/main/java/com/grigowashere/loratester/LoraApp.java

@@ -0,0 +1,94 @@
+package com.grigowashere.loratester;
+
+import android.app.Application;
+
+import com.grigowashere.loratester.api.ServerApi;
+import com.grigowashere.loratester.net.NetworkMonitor;
+import com.grigowashere.loratester.track.TrackRecorder;
+
+import org.mapsforge.map.android.graphics.AndroidGraphicFactory;
+
+public class LoraApp extends Application {
+
+    private TelemetryUploader telemetryUploader;
+    private SettingsRepository settingsRepository;
+    private TrackRecorder trackRecorder;
+    private NetworkMonitor networkMonitor;
+    private PeerStatsCache peerStatsCache;
+    private CommandPoller commandPoller;
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        AndroidGraphicFactory.createInstance(this);
+        settingsRepository = new SettingsRepository(this);
+        networkMonitor = new NetworkMonitor(this);
+        networkMonitor.start();
+        telemetryUploader = new TelemetryUploader(this, settingsRepository, networkMonitor);
+        peerStatsCache = new PeerStatsCache();
+        ServerApi serverApi = new ServerApi(settingsRepository.getServerUrl());
+        String deviceId = settingsRepository.getOrCreateDeviceId();
+        trackRecorder = new TrackRecorder(
+                serverApi,
+                telemetryUploader,
+                deviceId,
+                networkMonitor
+        );
+        commandPoller = new CommandPoller(
+                serverApi,
+                deviceId,
+                telemetryUploader,
+                trackRecorder,
+                peerStatsCache
+        );
+        commandPoller.start();
+    }
+
+    public NetworkMonitor getNetworkMonitor() {
+        return networkMonitor;
+    }
+
+    public TelemetryUploader getTelemetryUploader() {
+        return telemetryUploader;
+    }
+
+    public SettingsRepository getSettingsRepository() {
+        return settingsRepository;
+    }
+
+    public TrackRecorder getTrackRecorder() {
+        return trackRecorder;
+    }
+
+    public PeerStatsCache getPeerStatsCache() {
+        return peerStatsCache;
+    }
+
+    public CommandPoller getCommandPoller() {
+        return commandPoller;
+    }
+
+    public void refreshTrackRecorder() {
+        if (commandPoller != null) {
+            commandPoller.stop();
+        }
+        if (peerStatsCache == null) {
+            peerStatsCache = new PeerStatsCache();
+        }
+        ServerApi serverApi = new ServerApi(settingsRepository.getServerUrl());
+        trackRecorder = new TrackRecorder(
+                serverApi,
+                telemetryUploader,
+                settingsRepository.getOrCreateDeviceId(),
+                networkMonitor
+        );
+        commandPoller = new CommandPoller(
+                serverApi,
+                settingsRepository.getOrCreateDeviceId(),
+                telemetryUploader,
+                trackRecorder,
+                peerStatsCache
+        );
+        commandPoller.start();
+    }
+}

app/src/main/java/com/grigowashere/loratester/MainActivity.java

@@ -0,0 +1,101 @@
+package com.grigowashere.loratester;
+
+import android.Manifest;
+import android.content.pm.PackageManager;
+import android.os.Bundle;
+
+import androidx.activity.EdgeToEdge;
+import androidx.activity.result.ActivityResultLauncher;
+import androidx.activity.result.contract.ActivityResultContracts;
+import androidx.annotation.NonNull;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.content.ContextCompat;
+import androidx.core.graphics.Insets;
+import androidx.core.view.ViewCompat;
+import androidx.core.view.WindowInsetsCompat;
+import androidx.viewpager2.widget.ViewPager2;
+
+import com.google.android.material.tabs.TabLayout;
+import com.google.android.material.tabs.TabLayoutMediator;
+import com.grigowashere.loratester.location.LocationTracker;
+import com.grigowashere.loratester.track.TrackRecorder;
+import com.grigowashere.loratester.ui.MainPagerAdapter;
+
+public class MainActivity extends AppCompatActivity {
+
+    private TelemetryUploader telemetryUploader;
+    private LocationTracker locationTracker;
+
+    private final ActivityResultLauncher<String[]> locationPermissionLauncher =
+            registerForActivityResult(
+                    new ActivityResultContracts.RequestMultiplePermissions(),
+                    result -> startLocationIfPermitted()
+            );
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        EdgeToEdge.enable(this);
+        setContentView(R.layout.activity_main);
+        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
+            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
+            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
+            return insets;
+        });
+
+        LoraApp app = (LoraApp) getApplication();
+        telemetryUploader = app.getTelemetryUploader();
+        SettingsRepository settings = app.getSettingsRepository();
+
+        ViewPager2 pager = findViewById(R.id.viewPager);
+        TabLayout tabs = findViewById(R.id.tabLayout);
+        pager.setAdapter(new MainPagerAdapter(this));
+        new TabLayoutMediator(tabs, pager, (tab, position) -> {
+            int titleRes = switch (position) {
+                case 0 -> R.string.tab_map;
+                case 1 -> R.string.tab_stats;
+                case 2 -> R.string.tab_at;
+                case 3 -> R.string.tab_chat;
+                default -> R.string.tab_settings;
+            };
+            tab.setText(titleRes);
+        }).attach();
+
+        TrackRecorder trackRecorder = app.getTrackRecorder();
+        locationTracker = new LocationTracker(this, (lat, lon, alt) -> {
+            telemetryUploader.updateLocation(lat, lon);
+            trackRecorder.updateLocation(lat, lon, alt);
+        });
+
+        requestLocationPermission();
+        if (settings.isTelnetEnabled()) {
+            telemetryUploader.startTelnet();
+        }
+    }
+
+    private void requestLocationPermission() {
+        if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
+                == PackageManager.PERMISSION_GRANTED) {
+            startLocationIfPermitted();
+        } else {
+            locationPermissionLauncher.launch(new String[]{
+                    Manifest.permission.ACCESS_FINE_LOCATION,
+                    Manifest.permission.ACCESS_COARSE_LOCATION
+            });
+        }
+    }
+
+    private void startLocationIfPermitted() {
+        if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
+                == PackageManager.PERMISSION_GRANTED) {
+            locationTracker.start();
+        }
+    }
+
+    @Override
+    protected void onDestroy() {
+        locationTracker.stop();
+        telemetryUploader.stopTelnet();
+        super.onDestroy();
+    }
+}

app/src/main/java/com/grigowashere/loratester/PeerDevices.java

@@ -0,0 +1,77 @@
+package com.grigowashere.loratester;
+
+import com.grigowashere.loratester.api.DeviceInfo;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public final class PeerDevices {
+
+    private static final long ONLINE_MS = 30_000;
+
+    private PeerDevices() {
+    }
+
+    public static Result resolve(List<DeviceInfo> devices, String selfId) {
+        if (devices == null || selfId == null) {
+            return Result.error("no_devices");
+        }
+        List<DeviceInfo> android = new ArrayList<>();
+        long now = System.currentTimeMillis();
+        for (DeviceInfo d : devices) {
+            if (d.device_id != null && d.device_id.startsWith("android-")) {
+                android.add(d);
+            }
+        }
+        if (android.size() != 2) {
+            return Result.error("expected_two");
+        }
+        String peer = null;
+        int online = 0;
+        for (DeviceInfo d : android) {
+            if (d.last_seen > 0 && (now / 1000.0 - d.last_seen) <= 30) {
+                online++;
+            }
+            if (!selfId.equals(d.device_id)) {
+                peer = d.device_id;
+            }
+        }
+        if (peer == null) {
+            return Result.error("peer_missing");
+        }
+        return new Result(peer, android.size(), online);
+    }
+
+    public static final class Result {
+        public final String peerId;
+        public final int deviceCount;
+        public final int onlineCount;
+        public final String error;
+
+        private Result(String peerId, int deviceCount, int onlineCount) {
+            this.peerId = peerId;
+            this.deviceCount = deviceCount;
+            this.onlineCount = onlineCount;
+            this.error = null;
+        }
+
+        private Result(String error) {
+            this.peerId = null;
+            this.deviceCount = 0;
+            this.onlineCount = 0;
+            this.error = error;
+        }
+
+        static Result error(String code) {
+            return new Result(code);
+        }
+
+        public boolean ok() {
+            return peerId != null;
+        }
+
+        public boolean bothOnline() {
+            return ok() && onlineCount >= 2;
+        }
+    }
+}

app/src/main/java/com/grigowashere/loratester/PeerStatsCache.java

@@ -0,0 +1,48 @@
+package com.grigowashere.loratester;
+
+import androidx.annotation.Nullable;
+
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicReference;
+
+public class PeerStatsCache {
+
+    public static final class Snapshot {
+        public final String meta;
+        public final String role;
+        public final Double rssi;
+        public final long atMs;
+
+        public Snapshot(String meta, String role, Double rssi, long atMs) {
+            this.meta = meta;
+            this.role = role;
+            this.rssi = rssi;
+            this.atMs = atMs;
+        }
+    }
+
+    private final AtomicReference<Snapshot> snapshot = new AtomicReference<>();
+
+    public void updateFromPayload(Map<String, Object> payload) {
+        if (payload == null) {
+            return;
+        }
+        String meta = payload.get("meta") != null ? String.valueOf(payload.get("meta")) : null;
+        String role = payload.get("role") != null ? String.valueOf(payload.get("role")) : null;
+        Double rssi = null;
+        Object r = payload.get("rssi");
+        if (r instanceof Number) {
+            rssi = ((Number) r).doubleValue();
+        }
+        snapshot.set(new Snapshot(meta, role, rssi, System.currentTimeMillis()));
+    }
+
+    @Nullable
+    public Snapshot get() {
+        return snapshot.get();
+    }
+
+    public void clear() {
+        snapshot.set(null);
+    }
+}

app/src/main/java/com/grigowashere/loratester/SettingsRepository.java

@@ -0,0 +1,86 @@
+package com.grigowashere.loratester;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+
+public class SettingsRepository {
+
+    private static final String PREFS = "loratester_settings";
+    private static final String KEY_SERVER_URL = "server_url";
+    private static final String KEY_TELNET_HOST = "telnet_host";
+    private static final String KEY_TELNET_PORT = "telnet_port";
+    private static final String KEY_RSSI_REGEX = "rssi_regex";
+    private static final String KEY_RANGE_REGEX = "range_regex";
+    private static final String KEY_TELNET_ENABLED = "telnet_enabled";
+    private static final String KEY_DEVICE_ID = "device_id";
+
+    public static final String DEFAULT_SERVER = "http://grigowashere.ru:7634";
+    public static final String DEFAULT_TELNET_HOST = "127.0.0.1";
+    public static final int DEFAULT_TELNET_PORT = 2727;
+    public static final String DEFAULT_RSSI_REGEX = "(?:RSSI|Power)[:\\s]*(-?\\d+(?:\\.\\d+)?)";
+    public static final String DEFAULT_RANGE_REGEX = "range[:\\s]*([\\d.]+)";
+
+    private final SharedPreferences prefs;
+
+    public SettingsRepository(Context context) {
+        prefs = context.getApplicationContext()
+                .getSharedPreferences(PREFS, Context.MODE_PRIVATE);
+    }
+
+    public String getServerUrl() {
+        return prefs.getString(KEY_SERVER_URL, DEFAULT_SERVER);
+    }
+
+    public void setServerUrl(String url) {
+        prefs.edit().putString(KEY_SERVER_URL, url).apply();
+    }
+
+    public String getTelnetHost() {
+        return prefs.getString(KEY_TELNET_HOST, DEFAULT_TELNET_HOST);
+    }
+
+    public void setTelnetHost(String host) {
+        prefs.edit().putString(KEY_TELNET_HOST, host).apply();
+    }
+
+    public int getTelnetPort() {
+        return prefs.getInt(KEY_TELNET_PORT, DEFAULT_TELNET_PORT);
+    }
+
+    public void setTelnetPort(int port) {
+        prefs.edit().putInt(KEY_TELNET_PORT, port).apply();
+    }
+
+    public String getRssiRegex() {
+        return prefs.getString(KEY_RSSI_REGEX, DEFAULT_RSSI_REGEX);
+    }
+
+    public void setRssiRegex(String regex) {
+        prefs.edit().putString(KEY_RSSI_REGEX, regex).apply();
+    }
+
+    public String getRangeRegex() {
+        return prefs.getString(KEY_RANGE_REGEX, DEFAULT_RANGE_REGEX);
+    }
+
+    public void setRangeRegex(String regex) {
+        prefs.edit().putString(KEY_RANGE_REGEX, regex).apply();
+    }
+
+    public boolean isTelnetEnabled() {
+        return prefs.getBoolean(KEY_TELNET_ENABLED, false);
+    }
+
+    public void setTelnetEnabled(boolean enabled) {
+        prefs.edit().putBoolean(KEY_TELNET_ENABLED, enabled).apply();
+    }
+
+    public String getOrCreateDeviceId() {
+        String id = prefs.getString(KEY_DEVICE_ID, null);
+        if (id == null || id.isEmpty()) {
+            id = "android-" + java.util.UUID.randomUUID().toString().substring(0, 8);
+            prefs.edit().putString(KEY_DEVICE_ID, id).apply();
+        }
+        return id;
+    }
+}

app/src/main/java/com/grigowashere/loratester/TelemetryUploader.java

@@ -0,0 +1,337 @@
+package com.grigowashere.loratester;
+
+import android.content.Context;
+import android.os.Handler;
+import android.os.Looper;
+import android.util.Log;
+
+import com.grigowashere.loratester.api.ServerApi;
+import com.grigowashere.loratester.api.TelemetryPayload;
+import com.grigowashere.loratester.api.UploadQueue;
+import com.grigowashere.loratester.net.NetworkMonitor;
+import com.grigowashere.loratester.location.GeoUtils;
+import com.grigowashere.loratester.telnet.AtCommandFormatter;
+import com.grigowashere.loratester.telnet.StatsExtractor;
+import com.grigowashere.loratester.telnet.TelnetClient;
+import com.grigowashere.loratester.telnet.TelnetFrameParser;
+
+import java.nio.charset.StandardCharsets;
+import java.util.Arrays;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.ScheduledFuture;
+import java.util.concurrent.TimeUnit;
+
+public class TelemetryUploader implements TelnetClient.Listener {
+
+    private static final String TAG = "TelemetryUploader";
+
+    public interface AtSendCallback {
+        void onResult(TelnetClient.SendResult result);
+    }
+
+    public interface StatsListener {
+        void onStatsUpdated(StatsExtractor.ExtractedStats stats);
+    }
+
+    private final SettingsRepository settings;
+    private final Handler mainHandler = new Handler(Looper.getMainLooper());
+    private final ExecutorService uploadExecutor = Executors.newSingleThreadExecutor();
+    private final ExecutorService telnetExecutor = Executors.newSingleThreadExecutor(r -> {
+        Thread t = new Thread(r, "TelnetWorker");
+        t.setDaemon(true);
+        return t;
+    });
+    private TelnetClient telnetClient;
+    private TelnetFrameParser frameParser;
+    private StatsExtractor statsExtractor;
+    private ServerApi serverApi;
+
+    private static final int CONSOLE_MAX_CHARS = 16_384;
+    private static final long SNAPSHOT_INTERVAL_MS = 1000;
+
+    private final ScheduledExecutorService snapshotScheduler =
+            Executors.newSingleThreadScheduledExecutor(r -> {
+                Thread t = new Thread(r, "TelnetSnapshot");
+                t.setDaemon(true);
+                return t;
+            });
+    private volatile ScheduledFuture<?> snapshotFuture;
+
+    private volatile double lat = Double.NaN;
+    private volatile double lon = Double.NaN;
+    private volatile boolean connected;
+    private final StringBuilder consoleLog = new StringBuilder();
+    private volatile StatsExtractor.ExtractedStats lastStats;
+    private volatile long lastStatsAtMs;
+    private StatsListener statsListener;
+    private final UploadQueue uploadQueue;
+    private final NetworkMonitor networkMonitor;
+
+    public TelemetryUploader(
+            Context context,
+            SettingsRepository settings,
+            NetworkMonitor networkMonitor
+    ) {
+        this.settings = settings;
+        this.networkMonitor = networkMonitor;
+        uploadQueue = new UploadQueue(context.getApplicationContext());
+        serverApi = new ServerApi(settings.getServerUrl());
+        statsExtractor = StatsExtractor.withDefaults();
+        frameParser = new TelnetFrameParser(this::onFrame);
+        networkMonitor.addListener(online -> {
+            if (online) {
+                flushUploadQueue();
+            }
+        });
+        if (networkMonitor.isOnline()) {
+            uploadExecutor.execute(this::flushUploadQueue);
+        }
+    }
+
+    public int getPendingUploadCount() {
+        return uploadQueue.size();
+    }
+
+    public void refreshApi() {
+        serverApi = new ServerApi(settings.getServerUrl());
+        telnetExecutor.execute(() -> {
+            statsExtractor = new StatsExtractor(
+                    settings.getRssiRegex(),
+                    settings.getRangeRegex()
+            );
+            frameParser = new TelnetFrameParser(TelemetryUploader.this::onFrame);
+        });
+    }
+
+    public void updateLocation(double lat, double lon) {
+        if (GeoUtils.isValidCoordinate(lat, lon)) {
+            this.lat = lat;
+            this.lon = lon;
+        }
+    }
+
+    private Double validLat() {
+        return GeoUtils.isValidCoordinate(lat, lon) ? lat : null;
+    }
+
+    private Double validLon() {
+        return GeoUtils.isValidCoordinate(lat, lon) ? lon : null;
+    }
+
+    public void startTelnet() {
+        serverApi = new ServerApi(settings.getServerUrl());
+        telnetExecutor.execute(() -> {
+            if (telnetClient != null) {
+                telnetClient.stop();
+                telnetClient = null;
+            }
+            statsExtractor = new StatsExtractor(
+                    settings.getRssiRegex(),
+                    settings.getRangeRegex()
+            );
+            frameParser = new TelnetFrameParser(TelemetryUploader.this::onFrame);
+            telnetClient = new TelnetClient(
+                    settings.getTelnetHost(),
+                    settings.getTelnetPort(),
+                    TelemetryUploader.this
+            );
+            telnetClient.start();
+        });
+    }
+
+    public void stopTelnet() {
+        stopSnapshotTicker();
+        telnetExecutor.execute(() -> {
+            if (telnetClient != null) {
+                telnetClient.stop();
+                telnetClient = null;
+            }
+            if (frameParser != null) {
+                frameParser.flush();
+            }
+        });
+    }
+
+    public boolean isTelnetConnected() {
+        return connected;
+    }
+
+    /** Sends AT command on telnet worker thread (safe while receiving data). */
+    public void sendAtCommand(String command, AtSendCallback callback) {
+        telnetExecutor.execute(() -> {
+            TelnetClient.SendResult result = sendAtCommandOnWorker(command);
+            if (callback != null) {
+                mainHandler.post(() -> callback.onResult(result));
+            }
+        });
+    }
+
+    private TelnetClient.SendResult sendAtCommandOnWorker(String command) {
+        String normalized = AtCommandFormatter.normalize(command);
+        appendConsole(">> " + normalized + "\n");
+        if (telnetClient == null) {
+            appendConsole("!! telnet not started\n");
+            return TelnetClient.SendResult.NOT_CONNECTED;
+        }
+        TelnetClient.SendResult result = telnetClient.sendAtCommand(command);
+        if (result != TelnetClient.SendResult.SENT) {
+            appendConsole("!! send failed: " + result + "\n");
+        }
+        return result;
+    }
+
+    public synchronized String getConsoleLog() {
+        return consoleLog.toString();
+    }
+
+    public synchronized void clearConsoleLog() {
+        consoleLog.setLength(0);
+    }
+
+    private synchronized void appendConsole(String text) {
+        consoleLog.append(text);
+        if (consoleLog.length() > CONSOLE_MAX_CHARS) {
+            consoleLog.delete(0, consoleLog.length() - CONSOLE_MAX_CHARS);
+        }
+    }
+
+    public void setStatsListener(StatsListener listener) {
+        this.statsListener = listener;
+        if (listener != null && lastStats != null) {
+            mainHandler.post(() -> listener.onStatsUpdated(lastStats));
+        }
+    }
+
+    public StatsExtractor.ExtractedStats getLastStats() {
+        return lastStats;
+    }
+
+    public long getLastStatsAtMs() {
+        return lastStatsAtMs;
+    }
+
+    private void onFrame(String frame) {
+        StatsExtractor.ExtractedStats stats = statsExtractor.extract(frame);
+        if (!stats.hasRadioFrame()) {
+            return;
+        }
+        lastStats = stats;
+        lastStatsAtMs = System.currentTimeMillis();
+        StatsListener listener = statsListener;
+        if (listener != null) {
+            mainHandler.post(() -> listener.onStatsUpdated(stats));
+        }
+        TelemetryPayload payload = new TelemetryPayload(
+                settings.getOrCreateDeviceId(),
+                validLat(),
+                validLon(),
+                stats.rssi,
+                stats.rangeM,
+                null,
+                stats.metaJson,
+                stats.role,
+                System.currentTimeMillis() / 1000.0
+        );
+        uploadExecutor.execute(() -> uploadTelemetry(payload));
+    }
+
+    private void uploadTelemetry(TelemetryPayload payload) {
+        if (networkMonitor.isOnline()) {
+            try {
+                serverApi.postTelemetry(payload);
+                flushUploadQueue();
+                return;
+            } catch (Exception e) {
+                Log.e(TAG, "upload failed", e);
+                appendConsole("!! server upload: " + e.getMessage() + "\n");
+            }
+        }
+        uploadQueue.enqueue(payload);
+        int pending = uploadQueue.size();
+        if (pending > 0 && pending % 10 == 0) {
+            appendConsole("!! queued uploads: " + pending + "\n");
+        }
+    }
+
+    private void flushUploadQueue() {
+        if (!networkMonitor.isOnline()) {
+            return;
+        }
+        int sent = uploadQueue.flushAll(serverApi);
+        if (sent > 0) {
+            appendConsole(">> uploaded " + sent + " queued frame(s)\n");
+        }
+    }
+
+    @Override
+    public void onConnected() {
+        mainHandler.post(() -> connected = true);
+        startSnapshotTicker();
+    }
+
+    @Override
+    public void onDisconnected() {
+        stopSnapshotTicker();
+        mainHandler.post(() -> connected = false);
+    }
+
+    private void startSnapshotTicker() {
+        stopSnapshotTicker();
+        snapshotFuture = snapshotScheduler.scheduleAtFixedRate(
+                () -> telnetExecutor.execute(this::tickSnapshot),
+                SNAPSHOT_INTERVAL_MS,
+                SNAPSHOT_INTERVAL_MS,
+                TimeUnit.MILLISECONDS
+        );
+    }
+
+    private void stopSnapshotTicker() {
+        if (snapshotFuture != null) {
+            snapshotFuture.cancel(false);
+            snapshotFuture = null;
+        }
+    }
+
+    private void tickSnapshot() {
+        if (frameParser != null && connected) {
+            frameParser.emitSnapshot();
+        }
+    }
+
+    @Override
+    public void onBytes(byte[] data, int length) {
+        byte[] copy = Arrays.copyOf(data, length);
+        telnetExecutor.execute(() -> {
+            appendConsole(new String(copy, StandardCharsets.UTF_8));
+            if (frameParser != null) {
+                frameParser.append(copy);
+            }
+        });
+    }
+
+    @Override
+    public void onError(String message) {
+        Log.w(TAG, "telnet: " + message);
+        telnetExecutor.execute(() -> appendConsole("!! " + message + "\n"));
+    }
+
+    /** Feeds simulated telnet stream for testing without hardware. */
+    public void simulateChunk(String text) {
+        byte[] bytes = text.getBytes(StandardCharsets.UTF_8);
+        telnetExecutor.execute(() -> {
+            if (frameParser != null) {
+                frameParser.append(bytes);
+            }
+        });
+    }
+
+    public ServerApi getServerApi() {
+        return serverApi;
+    }
+
+    public String getDeviceId() {
+        return settings.getOrCreateDeviceId();
+    }
+}

app/src/main/java/com/grigowashere/loratester/api/ChatMessage.java

@@ -0,0 +1,8 @@
+package com.grigowashere.loratester.api;
+
+public class ChatMessage {
+    public long id;
+    public String device_id;
+    public String text;
+    public double ts;
+}

app/src/main/java/com/grigowashere/loratester/api/DeviceCommand.java

@@ -0,0 +1,13 @@
+package com.grigowashere.loratester.api;
+
+import java.util.Map;
+
+public class DeviceCommand {
+    public long id;
+    public String from_device_id;
+    public String to_device_id;
+    public String kind;
+    public Map<String, Object> payload;
+    public double created_at;
+    public Double delivered_at;
+}

app/src/main/java/com/grigowashere/loratester/api/DeviceInfo.java

@@ -0,0 +1,15 @@
+package com.grigowashere.loratester.api;
+
+public class DeviceInfo {
+    public String device_id;
+    public double last_seen;
+    public Double lat;
+    public Double lon;
+    public Double rssi;
+    public Double range_m;
+    public String raw_frame;
+    public String meta;
+    /** TX or RX from last telnet frame. */
+    public String role;
+    public Double ts;
+}

app/src/main/java/com/grigowashere/loratester/api/PairedTrackSession.java

@@ -0,0 +1,15 @@
+package com.grigowashere.loratester.api;
+
+public class PairedTrackSession {
+    public long id;
+    public String device_a;
+    public String device_b;
+    public String initiator;
+    public String status;
+    public double start_at;
+    public Long track_id_a;
+    public Long track_id_b;
+    public double created_at;
+    public double server_time;
+    public boolean ready;
+}

app/src/main/java/com/grigowashere/loratester/api/ServerApi.java

@@ -0,0 +1,250 @@
+package com.grigowashere.loratester.api;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+import com.google.gson.reflect.TypeToken;
+
+import java.io.IOException;
+import java.lang.reflect.Type;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+
+import okhttp3.MediaType;
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.RequestBody;
+import okhttp3.Response;
+
+public class ServerApi {
+
+    public static final String HEADER_LORA_CLIENT = "X-Lora-Client";
+    public static final String CLIENT_ANDROID = "android";
+
+    private static final MediaType JSON = MediaType.get("application/json; charset=utf-8");
+    private static final Gson GSON = new Gson();
+    private static final Type DEVICE_LIST = new TypeToken<List<DeviceInfo>>() {}.getType();
+    private static final Type CHAT_LIST = new TypeToken<List<ChatMessage>>() {}.getType();
+    private static final Type TELEMETRY_HISTORY =
+            new TypeToken<List<TelemetryHistoryItem>>() {}.getType();
+    private static final Type TRACK_LIST = new TypeToken<List<TrackInfo>>() {}.getType();
+    private static final Type COMMAND_LIST = new TypeToken<List<DeviceCommand>>() {}.getType();
+
+    private final String baseUrl;
+    private final OkHttpClient client;
+
+    public ServerApi(String baseUrl) {
+        String url = baseUrl == null ? "" : baseUrl.trim();
+        while (url.endsWith("/")) {
+            url = url.substring(0, url.length() - 1);
+        }
+        this.baseUrl = url;
+        this.client = new OkHttpClient.Builder()
+                .connectTimeout(20, TimeUnit.SECONDS)
+                .readTimeout(60, TimeUnit.SECONDS)
+                .writeTimeout(60, TimeUnit.SECONDS)
+                .build();
+    }
+
+    public void postTelemetry(TelemetryPayload payload) throws IOException {
+        Map<String, Object> body = new HashMap<>();
+        body.put("device_id", payload.deviceId);
+        if (payload.lat != null) body.put("lat", payload.lat);
+        if (payload.lon != null) body.put("lon", payload.lon);
+        if (payload.rssi != null) body.put("rssi", payload.rssi);
+        if (payload.rangeM != null) body.put("range_m", payload.rangeM);
+        if (payload.meta != null) {
+            try {
+                JsonObject meta = JsonParser.parseString(payload.meta).getAsJsonObject();
+                body.put("meta", GSON.fromJson(meta, Map.class));
+                if (meta.has("fields") && meta.get("fields").isJsonObject()) {
+                    body.put("fields", GSON.fromJson(meta.get("fields"), Map.class));
+                }
+            } catch (Exception ignored) {
+                body.put("meta", payload.meta);
+            }
+        }
+        if (payload.role != null) body.put("role", payload.role);
+        if (payload.ts != null) body.put("ts", payload.ts);
+        postJson("/api/telemetry", body, true);
+    }
+
+    public List<DeviceInfo> getDevices() throws IOException {
+        return getJsonList("/api/devices", DEVICE_LIST);
+    }
+
+    public void postChat(String deviceId, String text) throws IOException {
+        Map<String, Object> body = new HashMap<>();
+        body.put("device_id", deviceId);
+        body.put("text", text);
+        postJson("/api/chat", body);
+    }
+
+    public List<ChatMessage> getChat(double since) throws IOException {
+        String path = "/api/chat?since=" + since;
+        return getJsonList(path, CHAT_LIST);
+    }
+
+    public List<TelemetryHistoryItem> getTelemetryHistory(String deviceId, int limit)
+            throws IOException {
+        String path = "/api/telemetry?device_id=" + deviceId + "&limit=" + limit;
+        return getJsonList(path, TELEMETRY_HISTORY);
+    }
+
+    public long startTrack(String deviceId) throws IOException {
+        Map<String, Object> body = new HashMap<>();
+        body.put("device_id", deviceId);
+        Map<String, Object> resp = postJsonMap("/api/tracks/start", body, true);
+        Number id = (Number) resp.get("track_id");
+        return id.longValue();
+    }
+
+    public void addTrackPoints(long trackId, List<Map<String, Object>> points) throws IOException {
+        Map<String, Object> body = new HashMap<>();
+        body.put("points", points);
+        postJson("/api/tracks/" + trackId + "/points", body, true);
+    }
+
+    public void finishTrack(long trackId) throws IOException {
+        postJson("/api/tracks/" + trackId + "/finish", new HashMap<>(), true);
+    }
+
+    public List<TrackInfo> listTracks(String deviceId) throws IOException {
+        return getJsonList("/api/tracks?device_id=" + deviceId + "&limit=50", TRACK_LIST);
+    }
+
+    public void postCommand(
+            String fromDeviceId,
+            String toDeviceId,
+            String kind,
+            Map<String, Object> payload
+    ) throws IOException {
+        Map<String, Object> body = new HashMap<>();
+        body.put("from_device_id", fromDeviceId);
+        body.put("to_device_id", toDeviceId);
+        body.put("kind", kind);
+        if (payload != null) {
+            body.put("payload", payload);
+        }
+        postJson("/api/commands", body, true);
+    }
+
+    public List<DeviceCommand> pollPendingCommands(String deviceId) throws IOException {
+        String path = "/api/commands/pending?device_id="
+                + java.net.URLEncoder.encode(deviceId, "UTF-8") + "&limit=20";
+        Request request = new Request.Builder()
+                .url(baseUrl + path)
+                .header(HEADER_LORA_CLIENT, CLIENT_ANDROID)
+                .get()
+                .build();
+        try (Response response = client.newCall(request).execute()) {
+            if (!response.isSuccessful() || response.body() == null) {
+                throw new IOException("HTTP " + response.code());
+            }
+            return GSON.fromJson(response.body().string(), COMMAND_LIST);
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+    public Map<String, Object> startPairedTrack(Map<String, Object> body) throws IOException {
+        return postJsonMap("/api/paired-tracks/start", body, true);
+    }
+
+    @SuppressWarnings("unchecked")
+    public Map<String, Object> getActivePairedTrack() throws IOException {
+        Request request = new Request.Builder()
+                .url(baseUrl + "/api/paired-tracks/active")
+                .get()
+                .build();
+        try (Response response = client.newCall(request).execute()) {
+            if (!response.isSuccessful() || response.body() == null) {
+                throw new IOException("HTTP " + response.code());
+            }
+            return GSON.fromJson(response.body().string(), Map.class);
+        }
+    }
+
+    public void ackPairedTrack(long sessionId, String deviceId, long trackId) throws IOException {
+        Map<String, Object> body = new HashMap<>();
+        body.put("session_id", sessionId);
+        body.put("device_id", deviceId);
+        body.put("track_id", trackId);
+        postJson("/api/paired-tracks/ack", body, true);
+    }
+
+    public void cancelPairedTrack(Long sessionId) throws IOException {
+        Map<String, Object> body = new HashMap<>();
+        if (sessionId != null) {
+            body.put("session_id", sessionId);
+        }
+        postJson("/api/paired-tracks/cancel", body, false);
+    }
+
+    public TrackDetail getTrack(long trackId) throws IOException {
+        Request request = new Request.Builder()
+                .url(baseUrl + "/api/tracks/" + trackId)
+                .get()
+                .build();
+        try (Response response = client.newCall(request).execute()) {
+            if (!response.isSuccessful() || response.body() == null) {
+                throw new IOException("HTTP " + response.code());
+            }
+            return GSON.fromJson(response.body().string(), TrackDetail.class);
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+    private Map<String, Object> postJsonMap(String path, Map<String, Object> body, boolean android)
+            throws IOException {
+        Request.Builder builder = new Request.Builder()
+                .url(baseUrl + path)
+                .post(RequestBody.create(GSON.toJson(body), JSON));
+        if (android) {
+            builder.header(HEADER_LORA_CLIENT, CLIENT_ANDROID);
+        }
+        try (Response response = client.newCall(builder.build()).execute()) {
+            if (!response.isSuccessful() || response.body() == null) {
+                throw new IOException("HTTP " + response.code());
+            }
+            return GSON.fromJson(response.body().string(), Map.class);
+        }
+    }
+
+    private void postJson(String path, Map<String, Object> body) throws IOException {
+        postJson(path, body, false);
+    }
+
+    private void postJson(String path, Map<String, Object> body, boolean androidClient)
+            throws IOException {
+        Request.Builder builder = new Request.Builder()
+                .url(baseUrl + path)
+                .post(RequestBody.create(GSON.toJson(body), JSON));
+        if (androidClient) {
+            builder.header(HEADER_LORA_CLIENT, CLIENT_ANDROID);
+        }
+        execute(builder.build());
+    }
+
+    private <T> T getJsonList(String path, Type type) throws IOException {
+        Request request = new Request.Builder()
+                .url(baseUrl + path)
+                .get()
+                .build();
+        try (Response response = client.newCall(request).execute()) {
+            if (!response.isSuccessful() || response.body() == null) {
+                throw new IOException("HTTP " + response.code());
+            }
+            return GSON.fromJson(response.body().string(), type);
+        }
+    }
+
+    private void execute(Request request) throws IOException {
+        try (Response response = client.newCall(request).execute()) {
+            if (!response.isSuccessful()) {
+                throw new IOException("HTTP " + response.code());
+            }
+        }
+    }
+}

app/src/main/java/com/grigowashere/loratester/api/TelemetryHistoryItem.java

@@ -0,0 +1,14 @@
+package com.grigowashere.loratester.api;
+
+public class TelemetryHistoryItem {
+    public long id;
+    public String device_id;
+    public Double lat;
+    public Double lon;
+    public Double rssi;
+    public Double range_m;
+    public String meta;
+    public String role;
+    public double ts;
+    public String source;
+}

app/src/main/java/com/grigowashere/loratester/api/TelemetryPayload.java

@@ -0,0 +1,36 @@
+package com.grigowashere.loratester.api;
+
+public class TelemetryPayload {
+    public final String deviceId;
+    public final Double lat;
+    public final Double lon;
+    public final Double rssi;
+    public final Double rangeM;
+    public final String rawFrame;
+    public final String meta;
+    /** TX = передатчик, RX = приёмник. */
+    public final String role;
+    public final Double ts;
+
+    public TelemetryPayload(
+            String deviceId,
+            Double lat,
+            Double lon,
+            Double rssi,
+            Double rangeM,
+            String rawFrame,
+            String meta,
+            String role,
+            Double ts
+    ) {
+        this.deviceId = deviceId;
+        this.lat = lat;
+        this.lon = lon;
+        this.rssi = rssi;
+        this.rangeM = rangeM;
+        this.rawFrame = rawFrame;
+        this.meta = meta;
+        this.role = role;
+        this.ts = ts;
+    }
+}

app/src/main/java/com/grigowashere/loratester/api/TrackDetail.java

@@ -0,0 +1,23 @@
+package com.grigowashere.loratester.api;
+
+import java.util.List;
+
+public class TrackDetail {
+    public long id;
+    public String device_id;
+    public double started_at;
+    public Double ended_at;
+    public String label;
+    public List<TrackPoint> points;
+
+    public static class TrackPoint {
+        public double ts;
+        public double lat;
+        public double lon;
+        public Double altitude_gps;
+        public Double elevation_m;
+        public Double rssi;
+        public String role;
+        public String meta;
+    }
+}

app/src/main/java/com/grigowashere/loratester/api/TrackInfo.java

@@ -0,0 +1,10 @@
+package com.grigowashere.loratester.api;
+
+public class TrackInfo {
+    public long id;
+    public String device_id;
+    public double started_at;
+    public Double ended_at;
+    public String label;
+    public int point_count;
+}

app/src/main/java/com/grigowashere/loratester/api/UploadQueue.java

@@ -0,0 +1,152 @@
+package com.grigowashere.loratester.api;
+
+import android.content.Context;
+import android.util.Log;
+
+import com.google.gson.Gson;
+import com.google.gson.reflect.TypeToken;
+
+import java.io.File;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.lang.reflect.Type;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Objects;
+
+/** Persistent queue for telemetry uploads when the network is down. */
+public class UploadQueue {
+
+    private static final String TAG = "UploadQueue";
+    private static final String FILE_NAME = "telemetry_upload_queue.json";
+    private static final int MAX_ITEMS = 500;
+
+    private static final Gson GSON = new Gson();
+    private static final Type LIST_TYPE = new TypeToken<List<QueuedItem>>() {}.getType();
+
+    private final File queueFile;
+    private final List<QueuedItem> items = new ArrayList<>();
+    private String lastMeta;
+
+    public UploadQueue(Context context) {
+        queueFile = new File(context.getFilesDir(), FILE_NAME);
+        load();
+    }
+
+    public synchronized int size() {
+        return items.size();
+    }
+
+    public synchronized void enqueue(TelemetryPayload payload) {
+        if (payload == null) {
+            return;
+        }
+        if (payload.meta != null && payload.meta.equals(lastMeta)) {
+            return;
+        }
+        lastMeta = payload.meta;
+        items.add(QueuedItem.from(payload));
+        trim();
+        persist();
+    }
+
+    public synchronized int flushAll(ServerApi api) {
+        if (api == null || items.isEmpty()) {
+            return 0;
+        }
+        int sent = 0;
+        Iterator<QueuedItem> it = items.iterator();
+        while (it.hasNext()) {
+            QueuedItem item = it.next();
+            try {
+                api.postTelemetry(item.toPayload());
+                it.remove();
+                sent++;
+            } catch (Exception e) {
+                Log.w(TAG, "flush stopped at " + sent + " sent", e);
+                break;
+            }
+        }
+        if (sent > 0) {
+            persist();
+        }
+        return sent;
+    }
+
+    private void trim() {
+        while (items.size() > MAX_ITEMS) {
+            items.remove(0);
+        }
+    }
+
+    private void load() {
+        if (!queueFile.exists()) {
+            return;
+        }
+        try (FileReader reader = new FileReader(queueFile)) {
+            List<QueuedItem> loaded = GSON.fromJson(reader, LIST_TYPE);
+            if (loaded != null) {
+                items.clear();
+                items.addAll(loaded);
+                trim();
+            }
+        } catch (Exception e) {
+            Log.w(TAG, "load queue failed", e);
+        }
+    }
+
+    private void persist() {
+        try (FileWriter writer = new FileWriter(queueFile)) {
+            GSON.toJson(items, writer);
+        } catch (Exception e) {
+            Log.w(TAG, "persist queue failed", e);
+        }
+    }
+
+    static final class QueuedItem {
+        String deviceId;
+        Double lat;
+        Double lon;
+        Double rssi;
+        Double rangeM;
+        String rawFrame;
+        String meta;
+        String role;
+        Double ts;
+
+        static QueuedItem from(TelemetryPayload p) {
+            QueuedItem q = new QueuedItem();
+            q.deviceId = p.deviceId;
+            q.lat = p.lat;
+            q.lon = p.lon;
+            q.rssi = p.rssi;
+            q.rangeM = p.rangeM;
+            q.rawFrame = p.rawFrame;
+            q.meta = p.meta;
+            q.role = p.role;
+            q.ts = p.ts;
+            return q;
+        }
+
+        TelemetryPayload toPayload() {
+            return new TelemetryPayload(
+                    deviceId, lat, lon, rssi, rangeM, rawFrame, meta, role, ts);
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (!(o instanceof QueuedItem other)) {
+                return false;
+            }
+            return Objects.equals(deviceId, other.deviceId)
+                    && Objects.equals(meta, other.meta)
+                    && Objects.equals(ts, other.ts);
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(deviceId, meta, ts);
+        }
+    }
+}

app/src/main/java/com/grigowashere/loratester/location/GeoUtils.java

@@ -0,0 +1,23 @@
+package com.grigowashere.loratester.location;
+
+public final class GeoUtils {
+
+    private static final double ZERO_EPS = 1e-5;
+
+    private GeoUtils() {
+    }
+
+    public static boolean isValidCoordinate(double lat, double lon) {
+        if (Double.isNaN(lat) || Double.isNaN(lon) || Double.isInfinite(lat) || Double.isInfinite(lon)) {
+            return false;
+        }
+        if (Math.abs(lat) < ZERO_EPS && Math.abs(lon) < ZERO_EPS) {
+            return false;
+        }
+        return lat >= -90.0 && lat <= 90.0 && lon >= -180.0 && lon <= 180.0;
+    }
+
+    public static boolean isValidCoordinate(Double lat, Double lon) {
+        return lat != null && lon != null && isValidCoordinate(lat.doubleValue(), lon.doubleValue());
+    }
+}

app/src/main/java/com/grigowashere/loratester/location/LocationTracker.java

@@ -0,0 +1,61 @@
+package com.grigowashere.loratester.location;
+
+import android.annotation.SuppressLint;
+import android.content.Context;
+import android.os.Looper;
+
+import com.google.android.gms.location.FusedLocationProviderClient;
+import com.google.android.gms.location.LocationCallback;
+import com.google.android.gms.location.LocationRequest;
+import com.google.android.gms.location.LocationResult;
+import com.google.android.gms.location.LocationServices;
+import com.google.android.gms.location.Priority;
+
+public class LocationTracker {
+
+    public interface Listener {
+        void onLocation(double lat, double lon, double altitude);
+    }
+
+    private final FusedLocationProviderClient client;
+    private final Listener listener;
+    private LocationCallback callback;
+
+    public LocationTracker(Context context, Listener listener) {
+        this.client = LocationServices.getFusedLocationProviderClient(context);
+        this.listener = listener;
+    }
+
+    @SuppressLint("MissingPermission")
+    public void start() {
+        if (callback != null) {
+            return;
+        }
+        LocationRequest request = new LocationRequest.Builder(
+                Priority.PRIORITY_HIGH_ACCURACY, 10_000L
+        ).setMinUpdateIntervalMillis(5_000L).build();
+
+        callback = new LocationCallback() {
+            @Override
+            public void onLocationResult(LocationResult result) {
+                if (result.getLastLocation() == null) {
+                    return;
+                }
+                double lat = result.getLastLocation().getLatitude();
+                double lon = result.getLastLocation().getLongitude();
+                double alt = result.getLastLocation().getAltitude();
+                if (GeoUtils.isValidCoordinate(lat, lon)) {
+                    listener.onLocation(lat, lon, alt);
+                }
+            }
+        };
+        client.requestLocationUpdates(request, callback, Looper.getMainLooper());
+    }
+
+    public void stop() {
+        if (callback != null) {
+            client.removeLocationUpdates(callback);
+            callback = null;
+        }
+    }
+}

app/src/main/java/com/grigowashere/loratester/net/NetworkMonitor.java

@@ -0,0 +1,114 @@
+package com.grigowashere.loratester.net;
+
+import android.content.Context;
+import android.net.ConnectivityManager;
+import android.net.Network;
+import android.net.NetworkCapabilities;
+import android.net.NetworkRequest;
+import android.os.Build;
+
+import androidx.annotation.NonNull;
+
+import java.util.concurrent.CopyOnWriteArrayList;
+
+/** Observes validated internet connectivity. */
+public class NetworkMonitor {
+
+    public interface Listener {
+        void onConnectivityChanged(boolean online);
+    }
+
+    private final ConnectivityManager connectivityManager;
+    private final CopyOnWriteArrayList<Listener> listeners = new CopyOnWriteArrayList<>();
+    private volatile boolean online;
+    private ConnectivityManager.NetworkCallback networkCallback;
+
+    public NetworkMonitor(@NonNull Context context) {
+        connectivityManager =
+                (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
+        online = checkOnline();
+    }
+
+    public boolean isOnline() {
+        return online;
+    }
+
+    public void addListener(@NonNull Listener listener) {
+        listeners.add(listener);
+        listener.onConnectivityChanged(online);
+    }
+
+    public void removeListener(@NonNull Listener listener) {
+        listeners.remove(listener);
+    }
+
+    public void start() {
+        if (networkCallback != null || connectivityManager == null) {
+            return;
+        }
+        networkCallback = new ConnectivityManager.NetworkCallback() {
+            @Override
+            public void onAvailable(@NonNull Network network) {
+                updateState();
+            }
+
+            @Override
+            public void onLost(@NonNull Network network) {
+                updateState();
+            }
+
+            @Override
+            public void onCapabilitiesChanged(
+                    @NonNull Network network,
+                    @NonNull NetworkCapabilities caps
+            ) {
+                updateState();
+            }
+        };
+        NetworkRequest request = new NetworkRequest.Builder()
+                .addCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)
+                .build();
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+            connectivityManager.registerDefaultNetworkCallback(networkCallback);
+        } else {
+            connectivityManager.registerNetworkCallback(request, networkCallback);
+        }
+        updateState();
+    }
+
+    public void stop() {
+        if (networkCallback != null && connectivityManager != null) {
+            try {
+                connectivityManager.unregisterNetworkCallback(networkCallback);
+            } catch (Exception ignored) {
+                // ignore
+            }
+            networkCallback = null;
+        }
+    }
+
+    private void updateState() {
+        boolean now = checkOnline();
+        if (now == online) {
+            return;
+        }
+        online = now;
+        for (Listener l : listeners) {
+            l.onConnectivityChanged(online);
+        }
+    }
+
+    private boolean checkOnline() {
+        if (connectivityManager == null) {
+            return false;
+        }
+        Network network = connectivityManager.getActiveNetwork();
+        if (network == null) {
+            return false;
+        }
+        NetworkCapabilities caps = connectivityManager.getNetworkCapabilities(network);
+        return caps != null
+                && caps.hasCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)
+                && caps.hasCapability(NetworkCapabilities.NET_CAPABILITY_VALIDATED);
+    }
+}

app/src/main/java/com/grigowashere/loratester/telnet/AtCommandFormatter.java

@@ -0,0 +1,33 @@
+package com.grigowashere.loratester.telnet;
+
+import java.nio.charset.StandardCharsets;
+
+/** Formats user input as an AT command line for serial/telnet bridges. */
+public final class AtCommandFormatter {
+
+    private AtCommandFormatter() {
+    }
+
+    public static String normalize(String input) {
+        if (input == null) {
+            return "";
+        }
+        String line = input.trim();
+        if (line.isEmpty()) {
+            return "";
+        }
+        if (!line.regionMatches(true, 0, "AT", 0, 2)) {
+            line = "AT" + line;
+        }
+        return line;
+    }
+
+    public static byte[] toWireBytes(String input) {
+        String line = normalize(input);
+        if (line.isEmpty()) {
+            return new byte[0];
+        }
+        String wire = line + "\r\n";
+        return wire.getBytes(StandardCharsets.UTF_8);
+    }
+}

app/src/main/java/com/grigowashere/loratester/telnet/AtCommands.java

@@ -0,0 +1,15 @@
+package com.grigowashere.loratester.telnet;
+
+/** Common AT commands for LoRa modules (via telnet bridge). */
+public final class AtCommands {
+
+    public static final String HELP = "AT+H";
+    public static final String TRANSMIT = "AT+TX";
+    public static final String RECEIVE = "AT+RX";
+    public static final String STATUS = "AT+STATUS";
+    public static final String RESET = "AT+RESET";
+    public static final String BASIC = "AT";
+
+    private AtCommands() {
+    }
+}

app/src/main/java/com/grigowashere/loratester/telnet/LoraStatsFormatter.java

@@ -0,0 +1,129 @@
+package com.grigowashere.loratester.telnet;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+
+import java.util.HashSet;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Set;
+
+public final class LoraStatsFormatter {
+
+    private LoraStatsFormatter() {
+    }
+
+    /** Human-readable lines from telemetry meta JSON (fields first). */
+    public static String formatMeta(String metaJson) {
+        if (metaJson == null || metaJson.isEmpty()) {
+            return "";
+        }
+        try {
+            JsonObject o = JsonParser.parseString(metaJson).getAsJsonObject();
+            StringBuilder sb = new StringBuilder();
+            Set<String> shown = new HashSet<>();
+
+            appendFieldsBlock(sb, o.get("fields"), shown);
+
+            String role = text(o, "role");
+            if (role != null) {
+                append(sb, "Роль", roleLabel(role));
+            }
+            append(sb, "Кадр", text(o, "frame"));
+            append(sb, "Мощность TX", dbl(o, "power_dbm"), " dBm");
+            append(sb, "RSSI", dbl(o, "rssi_dbm"), " dBm");
+            append(sb, "SNR", dbl(o, "snr_db"), " dB");
+            append(sb, "Частота", freqMhz(o), " MHz");
+            append(sb, "SF", integer(o, "spreading_factor"));
+            append(sb, "BW", integer(o, "bandwidth_khz"), " kHz");
+            append(sb, "Пакет", integer(o, "packet"));
+            append(sb, "Payload", text(o, "payload"));
+            append(sb, "On Air", dbl(o, "on_air_ms"), " ms");
+            append(sb, "TX Speed", dbl(o, "tx_pkt_per_s"), " pkt/s");
+            append(sb, "RX Speed", dbl(o, "rx_pkt_per_s"), " pkt/s");
+            append(sb, "PER", dbl(o, "per_percent"), " %");
+            return sb.toString().trim();
+        } catch (Exception ignored) {
+            return metaJson;
+        }
+    }
+
+    private static void appendFieldsBlock(StringBuilder sb, JsonElement fieldsEl, Set<String> shown) {
+        if (fieldsEl == null || !fieldsEl.isJsonObject()) {
+            return;
+        }
+        JsonObject fields = fieldsEl.getAsJsonObject();
+        for (Map.Entry<String, JsonElement> e : fields.entrySet()) {
+            String label = e.getKey();
+            if (isSkippedFieldLabel(label)) {
+                continue;
+            }
+            String norm = normalizeLabel(label);
+            if (shown.contains(norm)) {
+                continue;
+            }
+            shown.add(norm);
+            append(sb, label, e.getValue().getAsString());
+        }
+    }
+
+    private static String normalizeLabel(String label) {
+        return label.toLowerCase(Locale.ROOT).replaceAll("\\s+", " ").trim();
+    }
+
+    private static boolean isSkippedFieldLabel(String label) {
+        String l = normalizeLabel(label);
+        return l.equals("send") || l.equals("receive");
+    }
+
+    public static String roleLabel(String role) {
+        if (StatsExtractor.ROLE_TX.equals(role)) {
+            return "Передатчик (TX)";
+        }
+        if (StatsExtractor.ROLE_RX.equals(role)) {
+            return "Приёмник (RX)";
+        }
+        return role;
+    }
+
+    private static String freqMhz(JsonObject o) {
+        if (!o.has("frequency_hz")) {
+            return null;
+        }
+        long hz = o.get("frequency_hz").getAsLong();
+        return String.format(Locale.US, "%.3f", hz / 1_000_000.0);
+    }
+
+    private static void append(StringBuilder sb, String label, String value) {
+        if (value == null || value.isEmpty()) {
+            return;
+        }
+        if (sb.length() > 0) {
+            sb.append("\n");
+        }
+        sb.append(label).append(": ").append(value);
+    }
+
+    private static void append(StringBuilder sb, String label, String value, String suffix) {
+        if (value == null) {
+            return;
+        }
+        append(sb, label, value + suffix);
+    }
+
+    private static String text(JsonObject o, String key) {
+        JsonElement e = o.get(key);
+        return e != null && !e.isJsonNull() ? e.getAsString() : null;
+    }
+
+    private static String integer(JsonObject o, String key) {
+        JsonElement e = o.get(key);
+        return e != null && e.isJsonPrimitive() ? String.valueOf(e.getAsInt()) : null;
+    }
+
+    private static String dbl(JsonObject o, String key) {
+        JsonElement e = o.get(key);
+        return e != null && e.isJsonPrimitive() ? String.valueOf(e.getAsDouble()) : null;
+    }
+}

app/src/main/java/com/grigowashere/loratester/telnet/StatsExtractor.java

@@ -0,0 +1,318 @@
+package com.grigowashere.loratester.telnet;
+
+import com.google.gson.Gson;
+
+import java.util.LinkedHashMap;
+import java.util.Locale;
+import java.util.Map;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+/**
+ * Label-based regex parsing — order and count of fields may change on the device.
+ */
+public class StatsExtractor {
+
+    public static final String ROLE_TX = "TX";
+    public static final String ROLE_RX = "RX";
+
+    private static final Gson GSON = new Gson();
+
+    private static final Pattern FRAME_SEND = Pattern.compile("(?m)^\\s*SEND\\b");
+    private static final Pattern FRAME_RECEIVE = Pattern.compile("(?m)^\\s*RECEIVE\\b");
+    private static final Pattern POWER = Pattern.compile("Power\\s*:\\s*(\\d+(?:\\.\\d+)?)", Pattern.CASE_INSENSITIVE);
+    private static final Pattern RSSI = Pattern.compile("RSSI\\s*:\\s*(-?\\d+(?:\\.\\d+)?)", Pattern.CASE_INSENSITIVE);
+    private static final Pattern SNR = Pattern.compile("SNR\\s*:\\s*(-?\\d+(?:\\.\\d+)?)", Pattern.CASE_INSENSITIVE);
+    private static final Pattern FREQUENCY = Pattern.compile("Frequency\\s*:\\s*(\\d+)", Pattern.CASE_INSENSITIVE);
+    private static final Pattern SPREADING = Pattern.compile("Spreading Factor\\s*:\\s*(\\d+)", Pattern.CASE_INSENSITIVE);
+    private static final Pattern BANDWIDTH = Pattern.compile("Bandwidth\\s*:\\s*(\\d+)", Pattern.CASE_INSENSITIVE);
+    private static final Pattern PACKET = Pattern.compile("Packet\\s*:\\s*(\\d+)", Pattern.CASE_INSENSITIVE);
+    private static final Pattern PACKET_NUMBER = Pattern.compile("Packet Number\\s*:\\s*(\\d+)", Pattern.CASE_INSENSITIVE);
+    private static final Pattern PAYLOAD = Pattern.compile("Payload\\s*:\\s*(.+)", Pattern.CASE_INSENSITIVE);
+    private static final Pattern ON_AIR = Pattern.compile("On Air\\s*:\\s*([\\d.]+)", Pattern.CASE_INSENSITIVE);
+    private static final Pattern TX_SPEED = Pattern.compile("TX Speed\\s*:\\s*([\\d.]+)", Pattern.CASE_INSENSITIVE);
+    private static final Pattern RX_SPEED = Pattern.compile("RX Speed\\s*:\\s*([\\d.]+)", Pattern.CASE_INSENSITIVE);
+    private static final Pattern PER = Pattern.compile("PER\\s*:\\s*([\\d.]+)", Pattern.CASE_INSENSITIVE);
+
+    private final Pattern rssiPattern;
+    private final Pattern rangePattern;
+
+    public StatsExtractor(String rssiRegex, String rangeRegex) {
+        this.rssiPattern = Pattern.compile(rssiRegex, Pattern.CASE_INSENSITIVE);
+        this.rangePattern = Pattern.compile(rangeRegex, Pattern.CASE_INSENSITIVE);
+    }
+
+    public static StatsExtractor withDefaults() {
+        return new StatsExtractor(
+                "RSSI\\s*:\\s*(-?\\d+(?:\\.\\d+)?)",
+                "range\\s*:\\s*([\\d.]+)"
+        );
+    }
+
+    public ExtractedStats extract(String frame) {
+        if (frame == null || frame.isBlank()) {
+            return empty(frame);
+        }
+
+        String normalized = TelnetText.normalize(frame);
+
+        Map<String, Object> meta = new LinkedHashMap<>();
+        Map<String, String> fields = new LinkedHashMap<>();
+        collectLabeledLines(normalized, fields);
+
+        String frameType = detectFrameType(normalized);
+        String role = frameTypeToRole(frameType);
+        if (frameType != null) {
+            meta.put("frame", frameType);
+        }
+        if (role != null) {
+            meta.put("role", role);
+        }
+        if (!fields.isEmpty()) {
+            meta.put("fields", fields);
+        }
+
+        Double rssiDbm = firstDouble(RSSI, normalized);
+        if (rssiDbm == null) {
+            rssiDbm = matchDouble(rssiPattern, normalized);
+        }
+        Double txPower = matchDouble(POWER, normalized);
+        Double snrDb = matchDouble(SNR, normalized);
+
+        if (rssiDbm != null) {
+            meta.put("rssi_dbm", rssiDbm);
+        }
+        if (txPower != null) {
+            meta.put("power_dbm", txPower);
+        }
+        if (snrDb != null) {
+            meta.put("snr_db", snrDb);
+        }
+
+        putLong(meta, "frequency_hz", matchLong(FREQUENCY, normalized));
+        putInt(meta, "spreading_factor", matchInt(SPREADING, normalized));
+        putInt(meta, "bandwidth_khz", matchInt(BANDWIDTH, normalized));
+        Integer packet = matchInt(PACKET_NUMBER, normalized);
+        if (packet == null) {
+            packet = matchInt(PACKET, normalized);
+        }
+        putInt(meta, "packet", packet);
+        putString(meta, "payload", matchString(PAYLOAD, normalized));
+        putDouble(meta, "on_air_ms", matchDouble(ON_AIR, normalized));
+        putDouble(meta, "tx_pkt_per_s", matchDouble(TX_SPEED, normalized));
+        putDouble(meta, "rx_pkt_per_s", matchDouble(RX_SPEED, normalized));
+        putDouble(meta, "per_percent", matchDouble(PER, normalized));
+
+        enrichFieldsFromStructured(meta, fields);
+
+        Double rangeM = matchDouble(rangePattern, normalized);
+        Double displayDbm = rssiDbm != null ? rssiDbm : txPower;
+
+        String metaJson = meta.isEmpty() ? null : GSON.toJson(meta);
+        return new ExtractedStats(
+                displayDbm, rangeM, frame, metaJson, frameType, role, txPower, rssiDbm, snrDb
+        );
+    }
+
+    private static void collectLabeledLines(String frame, Map<String, String> fields) {
+        for (String line : frame.split("\n")) {
+            String trimmed = line.trim();
+            if (trimmed.isEmpty()) {
+                continue;
+            }
+            int colon = trimmed.indexOf(':');
+            if (colon <= 0) {
+                continue;
+            }
+            String label = trimmed.substring(0, colon).trim();
+            String value = trimmed.substring(colon + 1).trim();
+            if (label.isEmpty()
+                    || label.equalsIgnoreCase("SEND")
+                    || label.equalsIgnoreCase("RECEIVE")) {
+                continue;
+            }
+            fields.put(label, value);
+        }
+    }
+
+    /** Ensure meta.fields has display lines even when line split missed some rows. */
+    private static void enrichFieldsFromStructured(
+            Map<String, Object> meta,
+            Map<String, String> fields
+    ) {
+        putFieldIfAbsent(fields, "Frequency", meta.get("frequency_hz"),
+                v -> v + " Hz");
+        putFieldIfAbsent(fields, "Power", meta.get("power_dbm"),
+                v -> v + " dBm");
+        putFieldIfAbsent(fields, "RSSI", meta.get("rssi_dbm"),
+                v -> String.valueOf(v));
+        putFieldIfAbsent(fields, "SNR", meta.get("snr_db"),
+                v -> String.valueOf(v));
+        putFieldIfAbsent(fields, "Spreading Factor", meta.get("spreading_factor"),
+                String::valueOf);
+        putFieldIfAbsent(fields, "Bandwidth", meta.get("bandwidth_khz"),
+                v -> v + " kHz");
+        Object packet = meta.get("packet");
+        if (packet != null) {
+            putFieldIfAbsent(fields, "Packet", packet, String::valueOf);
+            putFieldIfAbsent(fields, "Packet Number", packet, String::valueOf);
+        }
+        putFieldIfAbsent(fields, "Payload", meta.get("payload"),
+                v -> (String) v);
+        putFieldIfAbsent(fields, "On Air", meta.get("on_air_ms"),
+                v -> v + " ms");
+        putFieldIfAbsent(fields, "TX Speed", meta.get("tx_pkt_per_s"),
+                v -> v + " pkt/s");
+        putFieldIfAbsent(fields, "RX Speed", meta.get("rx_pkt_per_s"),
+                v -> v + " pkt/s");
+        putFieldIfAbsent(fields, "PER", meta.get("per_percent"),
+                v -> v + " %");
+    }
+
+    private static void putFieldIfAbsent(
+            Map<String, String> fields,
+            String label,
+            Object value,
+            java.util.function.Function<Object, String> format
+    ) {
+        if (value == null || fields.containsKey(label)) {
+            return;
+        }
+        fields.put(label, format.apply(value));
+    }
+
+    private static ExtractedStats empty(String frame) {
+        return new ExtractedStats(null, null, frame, null, null, null, null, null, null);
+    }
+
+    private static String detectFrameType(String frame) {
+        boolean send = FRAME_SEND.matcher(frame).find();
+        boolean recv = FRAME_RECEIVE.matcher(frame).find();
+        if (send && !recv) {
+            return "SEND";
+        }
+        if (recv && !send) {
+            return "RECEIVE";
+        }
+        if (send) {
+            return "SEND";
+        }
+        if (recv) {
+            return "RECEIVE";
+        }
+        return null;
+    }
+
+    private static String frameTypeToRole(String frameType) {
+        if ("SEND".equals(frameType)) {
+            return ROLE_TX;
+        }
+        if ("RECEIVE".equals(frameType)) {
+            return ROLE_RX;
+        }
+        return null;
+    }
+
+    private static Double firstDouble(Pattern pattern, String text) {
+        return matchDouble(pattern, text);
+    }
+
+    private static void putInt(Map<String, Object> meta, String key, Integer value) {
+        if (value != null) {
+            meta.put(key, value);
+        }
+    }
+
+    private static void putLong(Map<String, Object> meta, String key, Long value) {
+        if (value != null) {
+            meta.put(key, value);
+        }
+    }
+
+    private static void putDouble(Map<String, Object> meta, String key, Double value) {
+        if (value != null) {
+            meta.put(key, value);
+        }
+    }
+
+    private static void putString(Map<String, Object> meta, String key, String value) {
+        if (value != null && !value.isEmpty()) {
+            meta.put(key, value.trim());
+        }
+    }
+
+    private static Double matchDouble(Pattern pattern, String text) {
+        Matcher m = pattern.matcher(text);
+        if (m.find()) {
+            try {
+                return Double.parseDouble(m.group(1).trim());
+            } catch (NumberFormatException ignored) {
+                return null;
+            }
+        }
+        return null;
+    }
+
+    private static Integer matchInt(Pattern pattern, String text) {
+        Long v = matchLong(pattern, text);
+        return v != null ? v.intValue() : null;
+    }
+
+    private static Long matchLong(Pattern pattern, String text) {
+        Matcher m = pattern.matcher(text);
+        if (m.find()) {
+            try {
+                return Long.parseLong(m.group(1).trim());
+            } catch (NumberFormatException ignored) {
+                return null;
+            }
+        }
+        return null;
+    }
+
+    private static String matchString(Pattern pattern, String text) {
+        Matcher m = pattern.matcher(text);
+        if (m.find()) {
+            return m.group(1).trim();
+        }
+        return null;
+    }
+
+    public static final class ExtractedStats {
+        public final Double rssi;
+        public final Double rangeM;
+        public final String rawFrame;
+        public final String metaJson;
+        public final String frameType;
+        public final String role;
+        public final Double txPowerDbm;
+        public final Double rssiDbm;
+        public final Double snrDb;
+
+        public boolean hasRadioFrame() {
+            return frameType != null;
+        }
+
+        public ExtractedStats(
+                Double rssi,
+                Double rangeM,
+                String rawFrame,
+                String metaJson,
+                String frameType,
+                String role,
+                Double txPowerDbm,
+                Double rssiDbm,
+                Double snrDb
+        ) {
+            this.rssi = rssi;
+            this.rangeM = rangeM;
+            this.rawFrame = rawFrame;
+            this.metaJson = metaJson;
+            this.frameType = frameType;
+            this.role = role;
+            this.txPowerDbm = txPowerDbm;
+            this.rssiDbm = rssiDbm;
+            this.snrDb = snrDb;
+        }
+    }
+}

app/src/main/java/com/grigowashere/loratester/telnet/TelnetClient.java

@@ -0,0 +1,163 @@
+package com.grigowashere.loratester.telnet;
+
+import android.util.Log;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.InetSocketAddress;
+import java.net.Socket;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicReference;
+
+public class TelnetClient {
+
+    private static final String TAG = "TelnetClient";
+
+    public interface Listener {
+        void onConnected();
+
+        void onDisconnected();
+
+        void onBytes(byte[] data, int length);
+
+        void onError(String message);
+    }
+
+    public enum SendResult {
+        SENT,
+        NOT_CONNECTED,
+        EMPTY,
+        IO_ERROR
+    }
+
+    private final String host;
+    private final int port;
+    private final Listener listener;
+    private final AtomicBoolean running = new AtomicBoolean(false);
+    private final AtomicReference<Socket> activeSocket = new AtomicReference<>();
+    private final Object sendLock = new Object();
+    private Thread worker;
+
+    public TelnetClient(String host, int port, Listener listener) {
+        this.host = host;
+        this.port = port;
+        this.listener = listener;
+    }
+
+    public void start() {
+        if (running.getAndSet(true)) {
+            return;
+        }
+        worker = new Thread(this::runLoop, "TelnetClient");
+        worker.setDaemon(true);
+        worker.start();
+    }
+
+    public void stop() {
+        running.set(false);
+        closeActiveSocket();
+        if (worker != null) {
+            worker.interrupt();
+        }
+    }
+
+    public boolean isRunning() {
+        return running.get();
+    }
+
+    public boolean isConnected() {
+        Socket s = activeSocket.get();
+        return s != null && s.isConnected() && !s.isClosed();
+    }
+
+    /**
+     * Sends an AT command. Adds AT prefix and CR+LF if missing.
+     */
+    public SendResult sendAtCommand(String command) {
+        byte[] wire = AtCommandFormatter.toWireBytes(command);
+        if (wire.length == 0) {
+            return SendResult.EMPTY;
+        }
+        Socket socket = activeSocket.get();
+        if (socket == null || socket.isClosed()) {
+            return SendResult.NOT_CONNECTED;
+        }
+        synchronized (sendLock) {
+            try {
+                OutputStream out = socket.getOutputStream();
+                out.write(wire);
+                out.flush();
+                return SendResult.SENT;
+            } catch (IOException e) {
+                Log.e(TAG, "send failed", e);
+                return SendResult.IO_ERROR;
+            }
+        }
+    }
+
+    private void runLoop() {
+        int backoffMs = 1000;
+        while (running.get()) {
+            Socket socket = null;
+            try {
+                socket = new Socket();
+                socket.connect(new InetSocketAddress(host, port), 5000);
+                socket.setTcpNoDelay(true);
+                activeSocket.set(socket);
+                listener.onConnected();
+                backoffMs = 1000;
+                readStream(socket);
+            } catch (IOException e) {
+                if (running.get()) {
+                    listener.onError(e.getMessage());
+                }
+            } finally {
+                activeSocket.compareAndSet(socket, null);
+                listener.onDisconnected();
+                if (socket != null) {
+                    try {
+                        socket.close();
+                    } catch (IOException ignored) {
+                    }
+                }
+            }
+            if (!running.get()) {
+                break;
+            }
+            try {
+                Thread.sleep(backoffMs);
+            } catch (InterruptedException e) {
+                Thread.currentThread().interrupt();
+                break;
+            }
+            backoffMs = Math.min(backoffMs * 2, 15000);
+        }
+    }
+
+    private void closeActiveSocket() {
+        Socket s = activeSocket.getAndSet(null);
+        if (s != null) {
+            try {
+                s.close();
+            } catch (IOException ignored) {
+            }
+        }
+    }
+
+    private void readStream(Socket socket) throws IOException {
+        InputStream in = socket.getInputStream();
+        byte[] buf = new byte[4096];
+        while (running.get()) {
+            int n = in.read(buf);
+            if (n < 0) {
+                break;
+            }
+            if (n > 0) {
+                byte[] chunk = new byte[n];
+                System.arraycopy(buf, 0, chunk, 0, n);
+                listener.onBytes(chunk, n);
+            }
+        }
+    }
+}

app/src/main/java/com/grigowashere/loratester/telnet/TelnetFrameParser.java

@@ -0,0 +1,200 @@
+package com.grigowashere.loratester.telnet;
+
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+/**
+ * Splits telnet stream into LoRa screen frames by ESC clear and/or SEND/RECEIVE headers.
+ */
+public class TelnetFrameParser {
+
+    public interface FrameListener {
+        void onFrame(String text);
+    }
+
+    private static final Charset CHARSET = StandardCharsets.UTF_8;
+    /** Start of a new radio screen (TX or RX). */
+    private static final Pattern FRAME_HEADER =
+            Pattern.compile("(?m)^\\s*(SEND|RECEIVE)\\b");
+
+    private final List<byte[]> delimiters;
+    private final FrameListener listener;
+    private final byte[] buffer = new byte[65536];
+    private int bufferLen;
+
+    public TelnetFrameParser(FrameListener listener) {
+        this(listener, defaultDelimiters());
+    }
+
+    public TelnetFrameParser(FrameListener listener, List<byte[]> delimiters) {
+        this.listener = listener;
+        this.delimiters = new ArrayList<>(delimiters);
+    }
+
+    public static List<byte[]> defaultDelimiters() {
+        return Arrays.asList(
+                new byte[] {0x1b, '[', '2', 'J'},
+                new byte[] {0x1b, '[', 'H'},
+                new byte[] {0x0c}
+        );
+    }
+
+    public void append(byte[] chunk, int offset, int length) {
+        if (length <= 0) {
+            return;
+        }
+        int splitAt = findEarliestDelimiter(chunk, offset, length);
+        if (splitAt < 0) {
+            appendToBuffer(chunk, offset, length);
+            tryEmitByHeaders();
+            return;
+        }
+        appendToBuffer(chunk, offset, splitAt - offset);
+        emitFrame();
+        clearBuffer();
+        int delimLen = delimiterLengthAt(chunk, splitAt, offset, length);
+        int tailOffset = splitAt + delimLen;
+        int tailLen = offset + length - tailOffset;
+        append(chunk, tailOffset, tailLen);
+        tryEmitByHeaders();
+    }
+
+    public void append(byte[] chunk) {
+        append(chunk, 0, chunk.length);
+    }
+
+    public void flush() {
+        tryEmitByHeaders();
+        if (bufferLen > 0) {
+            emitFrame();
+            clearBuffer();
+        }
+    }
+
+    /**
+     * Emit latest SEND/RECEIVE screen from buffer (in-place refresh without ESC).
+     * Does not clear the buffer.
+     */
+    public void emitSnapshot() {
+        if (bufferLen == 0) {
+            return;
+        }
+        String text = TelnetText.normalize(bufferText());
+        Matcher m = FRAME_HEADER.matcher(text);
+        int lastStart = -1;
+        while (m.find()) {
+            lastStart = m.start();
+        }
+        if (lastStart < 0) {
+            return;
+        }
+        String frame = text.substring(lastStart).trim();
+        if (!frame.isEmpty()) {
+            listener.onFrame(frame);
+        }
+    }
+
+    /** Emit all complete frames when buffer holds multiple SEND/RECEIVE blocks. */
+    private void tryEmitByHeaders() {
+        if (bufferLen == 0) {
+            return;
+        }
+        String text = bufferText();
+        Matcher m = FRAME_HEADER.matcher(text);
+        List<Integer> starts = new ArrayList<>();
+        while (m.find()) {
+            starts.add(m.start());
+        }
+        if (starts.size() < 2) {
+            return;
+        }
+        for (int i = 0; i < starts.size() - 1; i++) {
+            String frame = text.substring(starts.get(i), starts.get(i + 1)).trim();
+            if (!frame.isEmpty()) {
+                listener.onFrame(frame);
+            }
+        }
+        String tail = text.substring(starts.get(starts.size() - 1));
+        clearBuffer();
+        byte[] tailBytes = tail.getBytes(CHARSET);
+        appendToBuffer(tailBytes, 0, tailBytes.length);
+    }
+
+    private String bufferText() {
+        return new String(buffer, 0, bufferLen, CHARSET);
+    }
+
+    private void emitFrame() {
+        if (bufferLen == 0) {
+            return;
+        }
+        String text = bufferText().trim();
+        if (!text.isEmpty()) {
+            listener.onFrame(text);
+        }
+    }
+
+    private void clearBuffer() {
+        bufferLen = 0;
+    }
+
+    private void appendToBuffer(byte[] src, int offset, int length) {
+        if (length <= 0) {
+            return;
+        }
+        if (bufferLen + length > buffer.length) {
+            tryEmitByHeaders();
+            if (bufferLen + length > buffer.length) {
+                emitFrame();
+                clearBuffer();
+            }
+        }
+        System.arraycopy(src, offset, buffer, bufferLen, length);
+        bufferLen += length;
+    }
+
+    private int findEarliestDelimiter(byte[] chunk, int offset, int length) {
+        int best = -1;
+        for (byte[] delim : delimiters) {
+            int idx = indexOf(chunk, offset, length, delim);
+            if (idx >= 0 && (best < 0 || idx < best)) {
+                best = idx;
+            }
+        }
+        return best;
+    }
+
+    private int delimiterLengthAt(byte[] chunk, int pos, int offset, int length) {
+        int end = offset + length;
+        for (byte[] delim : delimiters) {
+            if (pos + delim.length <= end && matchesAt(chunk, pos, delim)) {
+                return delim.length;
+            }
+        }
+        return 0;
+    }
+
+    private static int indexOf(byte[] haystack, int offset, int length, byte[] needle) {
+        int end = offset + length - needle.length;
+        for (int i = offset; i <= end; i++) {
+            if (matchesAt(haystack, i, needle)) {
+                return i;
+            }
+        }
+        return -1;
+    }
+
+    private static boolean matchesAt(byte[] haystack, int pos, byte[] needle) {
+        for (int i = 0; i < needle.length; i++) {
+            if (haystack[pos + i] != needle[i]) {
+                return false;
+            }
+        }
+        return true;
+    }
+}

app/src/main/java/com/grigowashere/loratester/telnet/TelnetText.java

@@ -0,0 +1,24 @@
+package com.grigowashere.loratester.telnet;
+
+import java.util.regex.Pattern;
+
+/** Cleans telnet screen text before field extraction. */
+public final class TelnetText {
+
+    private static final Pattern ANSI = Pattern.compile(
+            "\u001b\\[[0-9;?]*[ -/]*[@-~]|\u001b\\].*?\u0007|\u001b[@-Z\\\\-_]"
+    );
+
+    private TelnetText() {
+    }
+
+    public static String normalize(String text) {
+        if (text == null || text.isEmpty()) {
+            return "";
+        }
+        String s = ANSI.matcher(text).replaceAll("");
+        s = s.replace('\r', '\n');
+        s = s.replace("\u000c", "\n");
+        return s;
+    }
+}

app/src/main/java/com/grigowashere/loratester/track/TrackRecorder.java

@@ -0,0 +1,258 @@
+package com.grigowashere.loratester.track;
+
+import android.os.Handler;
+import android.os.Looper;
+import android.util.Log;
+
+import com.grigowashere.loratester.TelemetryUploader;
+import com.grigowashere.loratester.api.ServerApi;
+import com.grigowashere.loratester.location.GeoUtils;
+import com.grigowashere.loratester.net.NetworkMonitor;
+import com.grigowashere.loratester.telnet.StatsExtractor;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.ScheduledFuture;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+public class TrackRecorder {
+
+    private static final String TAG = "TrackRecorder";
+    private static final long SAMPLE_MS = 1000;
+    private static final long FLUSH_MS = 30_000;
+
+    public interface Listener {
+        void onStateChanged(boolean recording, int pointCount, long trackId);
+        void onError(String message);
+    }
+
+    private final ServerApi serverApi;
+    private final TelemetryUploader uploader;
+    private final NetworkMonitor networkMonitor;
+    private final String deviceId;
+    private final ExecutorService executor = Executors.newSingleThreadExecutor();
+    private final Handler mainHandler = new Handler(Looper.getMainLooper());
+    private final ScheduledExecutorService scheduler =
+            Executors.newSingleThreadScheduledExecutor(r -> {
+                Thread t = new Thread(r, "TrackSampler");
+                t.setDaemon(true);
+                return t;
+            });
+
+    private volatile double lat = Double.NaN;
+    private volatile double lon = Double.NaN;
+    private volatile double altitude = Double.NaN;
+    private volatile long trackId = -1;
+    private volatile boolean recording;
+    private final List<Map<String, Object>> buffer = new ArrayList<>();
+    private int totalPoints;
+    private ScheduledFuture<?> sampleTask;
+    private ScheduledFuture<?> flushTask;
+    private Listener listener;
+    private Listener pairedListener;
+
+    public TrackRecorder(
+            ServerApi serverApi,
+            TelemetryUploader uploader,
+            String deviceId,
+            NetworkMonitor networkMonitor
+    ) {
+        this.serverApi = serverApi;
+        this.uploader = uploader;
+        this.deviceId = deviceId;
+        this.networkMonitor = networkMonitor;
+        networkMonitor.addListener(online -> {
+            if (online && recording) {
+                executor.execute(this::flushBuffer);
+            }
+        });
+    }
+
+    public void setListener(Listener listener) {
+        this.listener = listener;
+    }
+
+    public void setPairedListener(Listener pairedListener) {
+        this.pairedListener = pairedListener;
+    }
+
+    public void updateLocation(double lat, double lon, double altitude) {
+        if (GeoUtils.isValidCoordinate(lat, lon)) {
+            this.lat = lat;
+            this.lon = lon;
+        }
+        if (!Double.isNaN(altitude) && altitude != 0.0) {
+            this.altitude = altitude;
+        }
+    }
+
+    public boolean isRecording() {
+        return recording;
+    }
+
+    public int getPointCount() {
+        return totalPoints;
+    }
+
+    public long getTrackId() {
+        return trackId;
+    }
+
+    public void start() {
+        if (recording) {
+            return;
+        }
+        if (!networkMonitor.isOnline()) {
+            notifyError("Нужна сеть для начала трека");
+            return;
+        }
+        executor.execute(() -> {
+            try {
+                long id = serverApi.startTrack(deviceId);
+                synchronized (buffer) {
+                    buffer.clear();
+                }
+                totalPoints = 0;
+                trackId = id;
+                recording = true;
+                startTimers();
+                notifyState();
+            } catch (Exception e) {
+                Log.e(TAG, "start track failed", e);
+                notifyError(e.getMessage());
+            }
+        });
+    }
+
+    public void stop() {
+        if (!recording) {
+            return;
+        }
+        recording = false;
+        stopTimers();
+        executor.execute(() -> {
+            try {
+                flushBuffer();
+                if (trackId > 0) {
+                    serverApi.finishTrack(trackId);
+                }
+            } catch (Exception e) {
+                Log.e(TAG, "stop track failed", e);
+                notifyError(e.getMessage());
+            } finally {
+                trackId = -1;
+                notifyState();
+            }
+        });
+    }
+
+    private void startTimers() {
+        sampleTask = scheduler.scheduleAtFixedRate(
+                () -> executor.execute(this::samplePoint),
+                SAMPLE_MS,
+                SAMPLE_MS,
+                TimeUnit.MILLISECONDS
+        );
+        flushTask = scheduler.scheduleAtFixedRate(
+                () -> executor.execute(this::flushBuffer),
+                FLUSH_MS,
+                FLUSH_MS,
+                TimeUnit.MILLISECONDS
+        );
+    }
+
+    private void stopTimers() {
+        if (sampleTask != null) {
+            sampleTask.cancel(false);
+            sampleTask = null;
+        }
+        if (flushTask != null) {
+            flushTask.cancel(false);
+            flushTask = null;
+        }
+    }
+
+    private void samplePoint() {
+        if (!recording || trackId < 0) {
+            return;
+        }
+        if (!GeoUtils.isValidCoordinate(lat, lon)) {
+            return;
+        }
+        StatsExtractor.ExtractedStats stats = uploader.getLastStats();
+        Map<String, Object> point = new HashMap<>();
+        point.put("ts", System.currentTimeMillis() / 1000.0);
+        point.put("lat", lat);
+        point.put("lon", lon);
+        if (!Double.isNaN(altitude)) {
+            point.put("altitude_gps", altitude);
+        }
+        if (stats != null) {
+            if (stats.rssi != null) {
+                point.put("rssi", stats.rssi);
+            }
+            if (stats.role != null) {
+                point.put("role", stats.role);
+            }
+            if (stats.metaJson != null) {
+                point.put("meta", stats.metaJson);
+            }
+        }
+        synchronized (buffer) {
+            buffer.add(point);
+        }
+        totalPoints++;
+        notifyState();
+    }
+
+    private void flushBuffer() {
+        if (trackId < 0) {
+            return;
+        }
+        List<Map<String, Object>> batch;
+        synchronized (buffer) {
+            if (buffer.isEmpty()) {
+                return;
+            }
+            batch = new ArrayList<>(buffer);
+            buffer.clear();
+        }
+        try {
+            serverApi.addTrackPoints(trackId, batch);
+        } catch (Exception e) {
+            Log.e(TAG, "flush points failed", e);
+            synchronized (buffer) {
+                buffer.addAll(0, batch);
+            }
+            notifyError(e.getMessage());
+        }
+    }
+
+    private void notifyState() {
+        mainHandler.post(() -> {
+            if (listener != null) {
+                listener.onStateChanged(recording, totalPoints, trackId);
+            }
+            if (pairedListener != null) {
+                pairedListener.onStateChanged(recording, totalPoints, trackId);
+            }
+        });
+    }
+
+    private void notifyError(String msg) {
+        mainHandler.post(() -> {
+            if (listener != null) {
+                listener.onError(msg);
+            }
+            if (pairedListener != null) {
+                pairedListener.onError(msg);
+            }
+        });
+    }
+}

app/src/main/java/com/grigowashere/loratester/ui/AtFragment.java

@@ -0,0 +1,260 @@
+package com.grigowashere.loratester.ui;
+
+import android.content.Context;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+import android.widget.ScrollView;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+
+import com.google.android.material.button.MaterialButtonToggleGroup;
+import com.google.android.material.chip.Chip;
+import com.google.android.material.chip.ChipGroup;
+import com.google.android.material.textfield.TextInputEditText;
+import com.grigowashere.loratester.CommandPoller;
+import com.grigowashere.loratester.LoraApp;
+import com.grigowashere.loratester.PeerDevices;
+import com.grigowashere.loratester.R;
+import com.grigowashere.loratester.TelemetryUploader;
+import com.grigowashere.loratester.api.DeviceInfo;
+import com.grigowashere.loratester.telnet.AtCommands;
+import com.grigowashere.loratester.telnet.TelnetClient;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+public class AtFragment extends Fragment {
+
+    private final ExecutorService executor = Executors.newSingleThreadExecutor();
+    private FragmentPollHelper pollHelper;
+    private TelemetryUploader uploader;
+    private CommandPoller commandPoller;
+    private TextView atStatus;
+    private TextView atConsole;
+    private ScrollView atConsoleScroll;
+    private TextInputEditText atCommandInput;
+    private MaterialButtonToggleGroup atTargetGroup;
+    private String lastConsole = "";
+
+    @Override
+    public void onAttach(@NonNull Context context) {
+        super.onAttach(context);
+        LoraApp app = (LoraApp) context.getApplicationContext();
+        uploader = app.getTelemetryUploader();
+        commandPoller = app.getCommandPoller();
+    }
+
+    @Nullable
+    @Override
+    public View onCreateView(
+            @NonNull LayoutInflater inflater,
+            @Nullable ViewGroup container,
+            @Nullable Bundle savedInstanceState
+    ) {
+        return inflater.inflate(R.layout.fragment_at, container, false);
+    }
+
+    @Override
+    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
+        atStatus = view.findViewById(R.id.atStatus);
+        atConsole = view.findViewById(R.id.atConsole);
+        atConsoleScroll = view.findViewById(R.id.atConsoleScroll);
+        atCommandInput = view.findViewById(R.id.atCommandInput);
+        atTargetGroup = view.findViewById(R.id.atTargetGroup);
+        ChipGroup chips = view.findViewById(R.id.atQuickChips);
+        Button sendBtn = view.findViewById(R.id.atSendBtn);
+        Button clearLog = view.findViewById(R.id.atClearLog);
+        pollHelper = new FragmentPollHelper(this, this::refreshConsole);
+
+        if (atTargetGroup != null) {
+            atTargetGroup.check(R.id.atTargetLocal);
+        }
+
+        addQuickChip(chips, "AT+H", AtCommands.HELP);
+        addQuickChip(chips, "AT+TX", AtCommands.TRANSMIT);
+        addQuickChip(chips, "AT+RX", AtCommands.RECEIVE);
+        addQuickChip(chips, "AT+STATUS", AtCommands.STATUS);
+        addQuickChip(chips, "AT", AtCommands.BASIC);
+
+        sendBtn.setOnClickListener(v -> sendFromInput());
+        clearLog.setOnClickListener(v -> {
+            if (uploader != null) {
+                uploader.clearConsoleLog();
+            }
+            lastConsole = "";
+            if (atConsole != null) {
+                atConsole.setText("");
+            }
+        });
+
+        if (atCommandInput != null) {
+            atCommandInput.setOnEditorActionListener((textView, actionId, event) -> {
+                sendFromInput();
+                return true;
+            });
+        }
+    }
+
+    private boolean isPeerTarget() {
+        return atTargetGroup != null && atTargetGroup.getCheckedButtonId() == R.id.atTargetPeer;
+    }
+
+    private void addQuickChip(ChipGroup group, String label, String command) {
+        Chip chip = new Chip(requireContext());
+        chip.setText(label);
+        chip.setCheckable(false);
+        chip.setOnClickListener(v -> sendCommand(command));
+        group.addView(chip);
+    }
+
+    private void sendFromInput() {
+        if (atCommandInput == null || atCommandInput.getText() == null) {
+            return;
+        }
+        String cmd = atCommandInput.getText().toString().trim();
+        if (cmd.isEmpty()) {
+            return;
+        }
+        sendCommand(cmd);
+        atCommandInput.setText("");
+    }
+
+    private void sendCommand(String command) {
+        if (uploader == null || !isAdded()) {
+            return;
+        }
+        if (isPeerTarget()) {
+            sendToPeer(command);
+            return;
+        }
+        uploader.sendAtCommand(command, result -> {
+            if (!isAdded()) {
+                return;
+            }
+            Context ctx = getContext();
+            if (ctx == null) {
+                return;
+            }
+            if (result == TelnetClient.SendResult.NOT_CONNECTED) {
+                Toast.makeText(ctx, R.string.at_not_connected, Toast.LENGTH_SHORT).show();
+            } else if (result == TelnetClient.SendResult.IO_ERROR) {
+                Toast.makeText(ctx, R.string.at_send_error, Toast.LENGTH_SHORT).show();
+            }
+            updateConsoleView();
+        });
+    }
+
+    private void sendToPeer(String command) {
+        if (commandPoller == null) {
+            return;
+        }
+        executor.execute(() -> {
+            try {
+                List<DeviceInfo> devices = uploader.getServerApi().getDevices();
+                PeerDevices.Result peer = PeerDevices.resolve(
+                        devices, uploader.getDeviceId());
+                if (!peer.ok()) {
+                    showToast(R.string.at_peer_unavailable);
+                    return;
+                }
+                Map<String, Object> payload = new HashMap<>();
+                payload.put("line", command);
+                commandPoller.postCommandToPeer(peer.peerId, "at", payload);
+                showToast(getString(R.string.at_sent_to_peer, peer.peerId));
+            } catch (Exception e) {
+                showToast(R.string.stats_push_failed);
+            }
+        });
+    }
+
+    private void showToast(int resId) {
+        if (isAdded()) {
+            requireActivity().runOnUiThread(() ->
+                    Toast.makeText(requireContext(), resId, Toast.LENGTH_SHORT).show());
+        }
+    }
+
+    private void showToast(String msg) {
+        if (isAdded()) {
+            requireActivity().runOnUiThread(() ->
+                    Toast.makeText(requireContext(), msg, Toast.LENGTH_SHORT).show());
+        }
+    }
+
+    private void refreshConsole() {
+        if (!isAdded() || uploader == null || atStatus == null) {
+            return;
+        }
+        boolean telnetOn = uploader.isTelnetConnected();
+        atStatus.setText(getString(
+                R.string.at_status,
+                telnetOn ? getString(R.string.connected) : getString(R.string.disconnected)
+        ));
+        updateConsoleView();
+        if (pollHelper != null) {
+            pollHelper.scheduleNext(400);
+        }
+    }
+
+    private void updateConsoleView() {
+        if (uploader == null || atConsole == null || atConsoleScroll == null) {
+            return;
+        }
+        String log = uploader.getConsoleLog();
+        if (!log.equals(lastConsole)) {
+            lastConsole = log;
+            atConsole.setText(log);
+            atConsoleScroll.post(() -> {
+                if (atConsoleScroll != null) {
+                    atConsoleScroll.fullScroll(View.FOCUS_DOWN);
+                }
+            });
+        }
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        if (pollHelper != null) {
+            pollHelper.start(0);
+        }
+    }
+
+    @Override
+    public void onPause() {
+        if (pollHelper != null) {
+            pollHelper.stop();
+        }
+        super.onPause();
+    }
+
+    @Override
+    public void onDestroyView() {
+        if (pollHelper != null) {
+            pollHelper.stop();
+        }
+        atStatus = null;
+        atConsole = null;
+        atConsoleScroll = null;
+        atCommandInput = null;
+        atTargetGroup = null;
+        pollHelper = null;
+        super.onDestroyView();
+    }
+
+    @Override
+    public void onDestroy() {
+        executor.shutdownNow();
+        super.onDestroy();
+    }
+}

app/src/main/java/com/grigowashere/loratester/ui/ChatAdapter.java

@@ -0,0 +1,76 @@
+package com.grigowashere.loratester.ui;
+
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.RecyclerView;
+
+import com.grigowashere.loratester.R;
+import com.grigowashere.loratester.api.ChatMessage;
+
+import java.text.DateFormat;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.List;
+import java.util.Locale;
+
+public class ChatAdapter extends RecyclerView.Adapter<ChatAdapter.Holder> {
+
+    private final List<ChatMessage> messages = new ArrayList<>();
+    private final DateFormat timeFormat =
+            DateFormat.getTimeInstance(DateFormat.SHORT, Locale.getDefault());
+
+    public void setMessages(List<ChatMessage> newMessages) {
+        messages.clear();
+        messages.addAll(newMessages);
+        notifyDataSetChanged();
+    }
+
+    public void appendMessages(List<ChatMessage> more) {
+        if (more.isEmpty()) {
+            return;
+        }
+        int start = messages.size();
+        messages.addAll(more);
+        notifyItemRangeInserted(start, more.size());
+    }
+
+    public double lastTs() {
+        if (messages.isEmpty()) {
+            return 0;
+        }
+        return messages.get(messages.size() - 1).ts;
+    }
+
+    @NonNull
+    @Override
+    public Holder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
+        View v = LayoutInflater.from(parent.getContext())
+                .inflate(R.layout.item_chat, parent, false);
+        return new Holder(v);
+    }
+
+    @Override
+    public void onBindViewHolder(@NonNull Holder holder, int position) {
+        ChatMessage m = messages.get(position);
+        String time = timeFormat.format(new Date((long) (m.ts * 1000)));
+        holder.text.setText(time + "  " + m.device_id + ": " + m.text);
+    }
+
+    @Override
+    public int getItemCount() {
+        return messages.size();
+    }
+
+    static class Holder extends RecyclerView.ViewHolder {
+        final TextView text;
+
+        Holder(@NonNull View itemView) {
+            super(itemView);
+            text = itemView.findViewById(R.id.chatItemText);
+        }
+    }
+}

app/src/main/java/com/grigowashere/loratester/ui/ChatFragment.java

@@ -0,0 +1,237 @@
+package com.grigowashere.loratester.ui;
+
+import android.content.Context;
+import android.os.Build;
+import android.os.Bundle;
+import android.os.VibrationEffect;
+import android.os.Vibrator;
+import android.os.VibratorManager;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.inputmethod.EditorInfo;
+import android.widget.Button;
+import android.widget.EditText;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.core.graphics.Insets;
+import androidx.core.view.ViewCompat;
+import androidx.core.view.WindowInsetsCompat;
+import androidx.fragment.app.Fragment;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+
+import com.grigowashere.loratester.LoraApp;
+import com.grigowashere.loratester.R;
+import com.grigowashere.loratester.TelemetryUploader;
+import com.grigowashere.loratester.api.ChatMessage;
+
+import java.util.List;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+public class ChatFragment extends Fragment {
+
+    private static final int VIBRATE_MS = 40;
+
+    private final ExecutorService executor = Executors.newSingleThreadExecutor();
+    private FragmentPollHelper pollHelper;
+    private TelemetryUploader uploader;
+    private ChatAdapter adapter;
+    private RecyclerView recycler;
+    private double chatSince;
+
+    @Override
+    public void onAttach(@NonNull Context context) {
+        super.onAttach(context);
+        uploader = ((LoraApp) context.getApplicationContext()).getTelemetryUploader();
+    }
+
+    @Nullable
+    @Override
+    public View onCreateView(
+            @NonNull LayoutInflater inflater,
+            @Nullable ViewGroup container,
+            @Nullable Bundle savedInstanceState
+    ) {
+        return inflater.inflate(R.layout.fragment_chat, container, false);
+    }
+
+    @Override
+    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
+        recycler = view.findViewById(R.id.chatRecycler);
+        EditText input = view.findViewById(R.id.chatInput);
+        Button send = view.findViewById(R.id.chatSend);
+        View inputBar = view.findViewById(R.id.chatInputBar);
+
+        adapter = new ChatAdapter();
+        LinearLayoutManager layoutManager = new LinearLayoutManager(requireContext());
+        recycler.setLayoutManager(layoutManager);
+        recycler.setAdapter(adapter);
+        pollHelper = new FragmentPollHelper(this, this::pollChat);
+
+        ViewCompat.setOnApplyWindowInsetsListener(inputBar, (v, windowInsets) -> {
+            Insets ime = windowInsets.getInsets(WindowInsetsCompat.Type.ime());
+            v.setPadding(v.getPaddingLeft(), v.getPaddingTop(), v.getPaddingRight(), ime.bottom);
+            if (ime.bottom > 0 && adapter.getItemCount() > 0) {
+                scrollToLatest();
+            }
+            return windowInsets;
+        });
+
+        Runnable doSend = () -> sendMessage(input);
+        send.setOnClickListener(v -> doSend.run());
+        input.setOnEditorActionListener((v, actionId, event) -> {
+            if (actionId == EditorInfo.IME_ACTION_SEND) {
+                doSend.run();
+                return true;
+            }
+            return false;
+        });
+
+        input.setOnFocusChangeListener((v, hasFocus) -> {
+            if (hasFocus) {
+                scrollToLatest();
+            }
+        });
+    }
+
+    private void sendMessage(EditText input) {
+        String text = input.getText().toString().trim();
+        if (text.isEmpty() || uploader == null) {
+            return;
+        }
+        input.setText("");
+        executor.execute(() -> {
+            try {
+                uploader.getServerApi().postChat(uploader.getDeviceId(), text);
+            } catch (Exception ignored) {
+                // ignore
+            }
+            if (pollHelper != null && pollHelper.canRun()) {
+                pollChat();
+            }
+        });
+    }
+
+    private void scrollToLatest() {
+        if (recycler == null || adapter.getItemCount() == 0) {
+            return;
+        }
+        int last = adapter.getItemCount() - 1;
+        recycler.post(() -> recycler.smoothScrollToPosition(last));
+    }
+
+    private void vibrateOnNewMessage() {
+        Context ctx = getContext();
+        if (ctx == null) {
+            return;
+        }
+        try {
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
+                VibratorManager vm = (VibratorManager) ctx.getSystemService(Context.VIBRATOR_MANAGER_SERVICE);
+                if (vm != null) {
+                    Vibrator v = vm.getDefaultVibrator();
+                    if (v != null && v.hasVibrator()) {
+                        v.vibrate(VibrationEffect.createOneShot(
+                                VIBRATE_MS,
+                                VibrationEffect.DEFAULT_AMPLITUDE
+                        ));
+                    }
+                }
+            } else {
+                Vibrator v = (Vibrator) ctx.getSystemService(Context.VIBRATOR_SERVICE);
+                if (v != null && v.hasVibrator()) {
+                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+                        v.vibrate(VibrationEffect.createOneShot(
+                                VIBRATE_MS,
+                                VibrationEffect.DEFAULT_AMPLITUDE
+                        ));
+                    } else {
+                        v.vibrate(VIBRATE_MS);
+                    }
+                }
+            }
+        } catch (Exception ignored) {
+            // ignore missing vibrator
+        }
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        if (pollHelper != null) {
+            pollHelper.start(0);
+        }
+    }
+
+    @Override
+    public void onPause() {
+        if (pollHelper != null) {
+            pollHelper.stop();
+        }
+        super.onPause();
+    }
+
+    @Override
+    public void onDestroyView() {
+        if (pollHelper != null) {
+            pollHelper.stop();
+        }
+        recycler = null;
+        super.onDestroyView();
+    }
+
+    @Override
+    public void onDestroy() {
+        executor.shutdownNow();
+        super.onDestroy();
+    }
+
+    private void pollChat() {
+        if (!pollHelper.canRun() || uploader == null) {
+            return;
+        }
+        String myId = uploader.getDeviceId();
+        executor.execute(() -> {
+            try {
+                List<ChatMessage> msgs = uploader.getServerApi().getChat(chatSince);
+                for (ChatMessage m : msgs) {
+                    chatSince = Math.max(chatSince, m.ts);
+                }
+                if (!pollHelper.canRun() || msgs.isEmpty()) {
+                    if (pollHelper.canRun()) {
+                        pollHelper.scheduleNext(2500);
+                    }
+                    return;
+                }
+                boolean vibrate = false;
+                for (ChatMessage m : msgs) {
+                    if (m.device_id != null && !m.device_id.equals(myId)) {
+                        vibrate = true;
+                        break;
+                    }
+                }
+                boolean shouldVibrate = vibrate;
+                requireActivity().runOnUiThread(() -> {
+                    if (!pollHelper.canRun()) {
+                        return;
+                    }
+                    if (adapter.getItemCount() == 0) {
+                        adapter.setMessages(msgs);
+                    } else {
+                        adapter.appendMessages(msgs);
+                    }
+                    scrollToLatest();
+                    if (shouldVibrate) {
+                        vibrateOnNewMessage();
+                    }
+                });
+            } catch (Exception ignored) {
+                // ignore
+            }
+            pollHelper.scheduleNext(2500);
+        });
+    }
+}

app/src/main/java/com/grigowashere/loratester/ui/FragmentPollHelper.java

@@ -0,0 +1,50 @@
+package com.grigowashere.loratester.ui;
+
+import android.os.Handler;
+import android.os.Looper;
+
+import androidx.annotation.NonNull;
+import androidx.fragment.app.Fragment;
+import androidx.lifecycle.Lifecycle;
+
+/**
+ * Safe periodic polling: no callbacks after onPause / when fragment is detached.
+ */
+public final class FragmentPollHelper {
+
+    private final Fragment fragment;
+    private final Handler handler = new Handler(Looper.getMainLooper());
+    private final Runnable task;
+    private boolean active;
+
+    public FragmentPollHelper(@NonNull Fragment fragment, @NonNull Runnable task) {
+        this.fragment = fragment;
+        this.task = task;
+    }
+
+    public void start(long initialDelayMs) {
+        active = true;
+        handler.removeCallbacks(task);
+        handler.postDelayed(task, initialDelayMs);
+    }
+
+    public void stop() {
+        active = false;
+        handler.removeCallbacks(task);
+    }
+
+    public void scheduleNext(long delayMs) {
+        if (!active || !fragment.isAdded()) {
+            return;
+        }
+        handler.removeCallbacks(task);
+        handler.postDelayed(task, delayMs);
+    }
+
+    public boolean canRun() {
+        return active
+                && fragment.isAdded()
+                && fragment.getView() != null
+                && fragment.getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.STARTED);
+    }
+}

app/src/main/java/com/grigowashere/loratester/ui/HistoryAdapter.java

@@ -0,0 +1,73 @@
+package com.grigowashere.loratester.ui;
+
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.RecyclerView;
+
+import com.grigowashere.loratester.R;
+import com.grigowashere.loratester.api.TelemetryHistoryItem;
+import com.grigowashere.loratester.telnet.LoraStatsFormatter;
+
+import java.text.DateFormat;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.List;
+import java.util.Locale;
+
+public class HistoryAdapter extends RecyclerView.Adapter<HistoryAdapter.Holder> {
+
+    private final DateFormat timeFormat =
+            DateFormat.getTimeInstance(DateFormat.MEDIUM, Locale.getDefault());
+    private final List<String> lines = new ArrayList<>();
+
+    public void setItems(List<TelemetryHistoryItem> items) {
+        lines.clear();
+        if (items == null) {
+            notifyDataSetChanged();
+            return;
+        }
+        for (TelemetryHistoryItem item : items) {
+            String time = timeFormat.format(new Date((long) (item.ts * 1000)));
+            String role = item.role != null ? item.role : "—";
+            String rssi = item.rssi != null ? item.rssi + " dBm" : "—";
+            String summary = LoraStatsFormatter.formatMeta(item.meta);
+            String shortMeta = summary.length() > 80
+                    ? summary.substring(0, 80) + "…"
+                    : summary;
+            lines.add(time + " · " + role + " · " + rssi
+                    + (shortMeta.isEmpty() ? "" : "\n" + shortMeta));
+        }
+        notifyDataSetChanged();
+    }
+
+    @NonNull
+    @Override
+    public Holder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
+        View v = LayoutInflater.from(parent.getContext())
+                .inflate(R.layout.item_history, parent, false);
+        return new Holder(v);
+    }
+
+    @Override
+    public void onBindViewHolder(@NonNull Holder holder, int position) {
+        holder.line.setText(lines.get(position));
+    }
+
+    @Override
+    public int getItemCount() {
+        return lines.size();
+    }
+
+    static class Holder extends RecyclerView.ViewHolder {
+        final TextView line;
+
+        Holder(@NonNull View itemView) {
+            super(itemView);
+            line = itemView.findViewById(R.id.historyLine);
+        }
+    }
+}

app/src/main/java/com/grigowashere/loratester/ui/MainPagerAdapter.java

@@ -0,0 +1,30 @@
+package com.grigowashere.loratester.ui;
+
+import androidx.annotation.NonNull;
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentActivity;
+import androidx.viewpager2.adapter.FragmentStateAdapter;
+
+public class MainPagerAdapter extends FragmentStateAdapter {
+
+    public MainPagerAdapter(@NonNull FragmentActivity activity) {
+        super(activity);
+    }
+
+    @NonNull
+    @Override
+    public Fragment createFragment(int position) {
+        return switch (position) {
+            case 0 -> new MapFragment();
+            case 1 -> new StatsFragment();
+            case 2 -> new AtFragment();
+            case 3 -> new ChatFragment();
+            default -> new SettingsFragment();
+        };
+    }
+
+    @Override
+    public int getItemCount() {
+        return 5;
+    }
+}

app/src/main/java/com/grigowashere/loratester/ui/MapFragment.java

@@ -0,0 +1,666 @@
+package com.grigowashere.loratester.ui;
+
+import android.content.Context;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.AdapterView;
+import android.widget.ArrayAdapter;
+import android.widget.Button;
+import android.widget.Spinner;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+
+import com.grigowashere.loratester.CommandPoller;
+import com.grigowashere.loratester.LoraApp;
+import com.grigowashere.loratester.PeerDevices;
+import com.grigowashere.loratester.R;
+import com.grigowashere.loratester.TelemetryUploader;
+import com.grigowashere.loratester.api.DeviceInfo;
+import com.grigowashere.loratester.api.ServerApi;
+import com.grigowashere.loratester.api.TrackDetail;
+import com.grigowashere.loratester.api.TrackInfo;
+import com.grigowashere.loratester.location.GeoUtils;
+import com.grigowashere.loratester.net.NetworkMonitor;
+import com.grigowashere.loratester.telnet.StatsExtractor;
+import com.grigowashere.loratester.track.TrackRecorder;
+
+import org.mapsforge.core.graphics.Bitmap;
+import org.mapsforge.core.graphics.Color;
+import org.mapsforge.core.model.BoundingBox;
+import org.mapsforge.core.model.LatLong;
+import org.mapsforge.map.android.graphics.AndroidGraphicFactory;
+import org.mapsforge.map.android.util.AndroidUtil;
+import org.mapsforge.map.android.view.MapView;
+import org.mapsforge.map.layer.Layer;
+import org.mapsforge.map.layer.cache.TileCache;
+import org.mapsforge.map.layer.download.TileDownloadLayer;
+import org.mapsforge.map.layer.download.tilesource.OpenStreetMapMapnik;
+import org.mapsforge.map.layer.overlay.Marker;
+import org.mapsforge.map.layer.overlay.Polyline;
+import org.mapsforge.map.model.MapViewPosition;
+
+import java.text.DateFormat;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+public class MapFragment extends Fragment {
+
+    private static final int TILE_SIZE_PX = 256;
+    private static final long DEVICE_POLL_MS = 5000;
+    /** Ignore GPS jitter smaller than ~11 m. */
+    private static final double POSITION_EPS = 0.0001;
+    private static final float USER_PAN_THRESHOLD_PX = 12f;
+
+    private static final int ARGB_TX = 0xFFE94560;
+    private static final int ARGB_RX = 0xFF4FC3F7;
+    private static final int ARGB_TRACK = 0xFF00FF88;
+
+    private final ExecutorService executor = Executors.newSingleThreadExecutor();
+    private final DateFormat timeFormat =
+            DateFormat.getTimeInstance(DateFormat.SHORT, Locale.getDefault());
+    private final Map<String, Marker> deviceMarkers = new HashMap<>();
+    private final List<Layer> trackLayers = new ArrayList<>();
+
+    private FragmentPollHelper pollHelper;
+    private TelemetryUploader uploader;
+    private TrackRecorder trackRecorder;
+    private CommandPoller commandPoller;
+    private MapView mapView;
+    private TileDownloadLayer downloadLayer;
+    private TileCache tileCache;
+    private TextView mapStatus;
+    private TextView trackStatus;
+    private Button btnTrack;
+    private Button btnPairedTrack;
+    private Spinner trackSpinner;
+    private List<TrackInfo> savedTracks = new ArrayList<>();
+    private boolean mapResumed;
+    private boolean mapInitialized;
+    private NetworkMonitor networkMonitor;
+    private NetworkMonitor.Listener networkListener;
+    private boolean networkOnline = true;
+    private boolean initialFitDone;
+    private boolean userMovedMap;
+    private boolean suppressTrackSpinner;
+    private Bitmap bitmapTx;
+    private Bitmap bitmapRx;
+    private Bitmap bitmapTrackPoint;
+    private float touchDownX;
+    private float touchDownY;
+
+    @Override
+    public void onAttach(@NonNull Context context) {
+        super.onAttach(context);
+        LoraApp app = (LoraApp) context.getApplicationContext();
+        uploader = app.getTelemetryUploader();
+        trackRecorder = app.getTrackRecorder();
+        commandPoller = app.getCommandPoller();
+        networkMonitor = app.getNetworkMonitor();
+    }
+
+    @Nullable
+    @Override
+    public View onCreateView(
+            @NonNull LayoutInflater inflater,
+            @Nullable ViewGroup container,
+            @Nullable Bundle savedInstanceState
+    ) {
+        return inflater.inflate(R.layout.fragment_map, container, false);
+    }
+
+    @Override
+    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
+        mapView = view.findViewById(R.id.mapView);
+        mapStatus = view.findViewById(R.id.mapStatus);
+        trackStatus = view.findViewById(R.id.trackStatus);
+        btnTrack = view.findViewById(R.id.btnTrack);
+        btnPairedTrack = view.findViewById(R.id.btnPairedTrack);
+        trackSpinner = view.findViewById(R.id.trackSpinner);
+        pollHelper = new FragmentPollHelper(this, this::refreshDevices);
+
+        networkOnline = networkMonitor != null && networkMonitor.isOnline();
+        networkListener = online -> {
+            networkOnline = online;
+            if (isAdded() && mapStatus != null) {
+                requireActivity().runOnUiThread(this::updateNetworkStatusLine);
+            }
+            if (online && downloadLayer != null && mapResumed) {
+                downloadLayer.onResume();
+            }
+        };
+        if (networkMonitor != null) {
+            networkMonitor.addListener(networkListener);
+        }
+
+        setupMapView();
+        btnTrack.setOnClickListener(v -> toggleTracking());
+        if (btnPairedTrack != null) {
+            btnPairedTrack.setOnClickListener(v -> startPairedTracking());
+        }
+        setupTrackRecorderListener();
+        setupTrackSpinnerListener();
+    }
+
+    private void setupTrackSpinnerListener() {
+        trackSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
+            @Override
+            public void onItemSelected(AdapterView<?> parent, View v, int pos, long id) {
+                if (suppressTrackSpinner || pos <= 0 || pos - 1 >= savedTracks.size()) {
+                    return;
+                }
+                showTrack(savedTracks.get(pos - 1).id);
+            }
+
+            @Override
+            public void onNothingSelected(AdapterView<?> parent) {
+            }
+        });
+    }
+
+    private void setupMapView() {
+        mapView.setClickable(true);
+        mapView.getMapScaleBar().setVisible(true);
+        mapView.setBuiltInZoomControls(false);
+
+        mapView.setOnTouchListener((v, event) -> {
+            int action = event.getActionMasked();
+            if (action == MotionEvent.ACTION_DOWN) {
+                touchDownX = event.getX();
+                touchDownY = event.getY();
+                v.getParent().requestDisallowInterceptTouchEvent(true);
+            } else if (action == MotionEvent.ACTION_MOVE) {
+                v.getParent().requestDisallowInterceptTouchEvent(true);
+                float dx = event.getX() - touchDownX;
+                float dy = event.getY() - touchDownY;
+                if (dx * dx + dy * dy > USER_PAN_THRESHOLD_PX * USER_PAN_THRESHOLD_PX) {
+                    userMovedMap = true;
+                }
+            } else if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_CANCEL) {
+                v.getParent().requestDisallowInterceptTouchEvent(false);
+            }
+            return false;
+        });
+
+        mapView.getModel().displayModel.setFixedTileSize(TILE_SIZE_PX);
+        tileCache = AndroidUtil.createTileCache(
+                requireContext(),
+                "loratester-tiles",
+                TILE_SIZE_PX,
+                1f,
+                mapView.getModel().frameBufferModel.getOverdrawFactor()
+        );
+
+        OpenStreetMapMapnik tileSource = OpenStreetMapMapnik.INSTANCE;
+        tileSource.setUserAgent("LoraTester/1.0");
+
+        downloadLayer = new TileDownloadLayer(
+                tileCache,
+                mapView.getModel().mapViewPosition,
+                tileSource,
+                AndroidGraphicFactory.INSTANCE
+        );
+        mapView.getLayerManager().getLayers().add(downloadLayer);
+        mapView.setZoomLevelMin(tileSource.getZoomLevelMin());
+        mapView.setZoomLevelMax(tileSource.getZoomLevelMax());
+        downloadLayer.start();
+
+        MapViewPosition position = (MapViewPosition) mapView.getModel().mapViewPosition;
+        position.setCenter(new LatLong(55.75, 37.62));
+        position.setZoomLevel((byte) 10);
+
+        bitmapTx = MapsforgeBitmaps.dot(ARGB_TX, 20);
+        bitmapRx = MapsforgeBitmaps.dot(ARGB_RX, 20);
+        bitmapTrackPoint = MapsforgeBitmaps.dot(ARGB_TRACK, 12);
+
+        mapInitialized = true;
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        mapResumed = true;
+        if (downloadLayer != null) {
+            downloadLayer.onResume();
+        }
+        if (pollHelper != null) {
+            pollHelper.start(0);
+        }
+        if (trackRecorder != null && btnTrack != null) {
+            setupTrackRecorderListener();
+        }
+        loadTrackList();
+    }
+
+    @Override
+    public void onPause() {
+        mapResumed = false;
+        if (pollHelper != null) {
+            pollHelper.stop();
+        }
+        if (downloadLayer != null) {
+            downloadLayer.onPause();
+        }
+        super.onPause();
+    }
+
+    @Override
+    public void onDestroyView() {
+        mapResumed = false;
+        mapInitialized = false;
+        initialFitDone = false;
+        if (pollHelper != null) {
+            pollHelper.stop();
+        }
+        if (networkMonitor != null && networkListener != null) {
+            networkMonitor.removeListener(networkListener);
+        }
+        networkListener = null;
+        if (trackRecorder != null) {
+            trackRecorder.setListener(null);
+        }
+        removeAllDeviceMarkers();
+        clearTrackLayers();
+        deviceMarkers.clear();
+        if (downloadLayer != null) {
+            downloadLayer.onDestroy();
+            downloadLayer = null;
+        }
+        if (mapView != null) {
+            mapView.destroy();
+        }
+        mapView = null;
+        tileCache = null;
+        bitmapTx = null;
+        bitmapRx = null;
+        bitmapTrackPoint = null;
+        mapStatus = null;
+        trackStatus = null;
+        btnTrack = null;
+        trackSpinner = null;
+        pollHelper = null;
+        super.onDestroyView();
+    }
+
+    @Override
+    public void onDestroy() {
+        executor.shutdownNow();
+        super.onDestroy();
+    }
+
+    private void updateNetworkStatusLine() {
+        if (mapStatus == null) {
+            return;
+        }
+        CharSequence current = mapStatus.getText();
+        String net = networkStatusSuffix();
+        if (current != null && current.toString().contains(" · ")) {
+            int idx = current.toString().lastIndexOf(" · ");
+            mapStatus.setText(current.subSequence(0, idx) + " · " + net);
+        }
+    }
+
+    private String networkStatusSuffix() {
+        return getString(networkOnline
+                ? R.string.map_network_online
+                : R.string.map_network_offline);
+    }
+
+    private void setupTrackRecorderListener() {
+        trackRecorder.setListener(new TrackRecorder.Listener() {
+            @Override
+            public void onStateChanged(boolean recording, int pointCount, long trackId) {
+                if (!isAdded() || btnTrack == null) {
+                    return;
+                }
+                btnTrack.setText(recording ? R.string.track_stop : R.string.track_start);
+                if (trackStatus != null) {
+                    trackStatus.setText(getString(R.string.track_status, pointCount));
+                }
+                if (!recording && trackId > 0) {
+                    loadTrackList();
+                }
+            }
+
+            @Override
+            public void onError(String message) {
+                if (isAdded() && trackStatus != null) {
+                    trackStatus.setText(getString(R.string.track_error, message));
+                }
+            }
+        });
+    }
+
+    private void toggleTracking() {
+        if (trackRecorder.isRecording()) {
+            trackRecorder.stop();
+        } else {
+            trackRecorder.start();
+        }
+    }
+
+    private void startPairedTracking() {
+        if (commandPoller == null || uploader == null || !isAdded()) {
+            return;
+        }
+        executor.execute(() -> {
+            try {
+                List<DeviceInfo> devices = uploader.getServerApi().getDevices();
+                PeerDevices.Result peer = PeerDevices.resolve(devices, uploader.getDeviceId());
+                if (!peer.bothOnline()) {
+                    requireActivity().runOnUiThread(() ->
+                            Toast.makeText(requireContext(), R.string.track_paired_need_two,
+                                    Toast.LENGTH_SHORT).show());
+                    return;
+                }
+                commandPoller.startPairedTrack(
+                        () -> {
+                            if (isAdded()) {
+                                Toast.makeText(requireContext(), R.string.track_paired_started,
+                                        Toast.LENGTH_SHORT).show();
+                            }
+                        },
+                        msg -> {
+                            if (isAdded()) {
+                                Toast.makeText(requireContext(), msg, Toast.LENGTH_SHORT).show();
+                            }
+                        });
+            } catch (Exception e) {
+                if (isAdded()) {
+                    requireActivity().runOnUiThread(() ->
+                            Toast.makeText(requireContext(), R.string.track_paired_need_two,
+                                    Toast.LENGTH_SHORT).show());
+                }
+            }
+        });
+    }
+
+    private void loadTrackList() {
+        if (uploader == null || !mapResumed) {
+            return;
+        }
+        String deviceId = uploader.getDeviceId();
+        executor.execute(() -> {
+            try {
+                List<TrackInfo> tracks = uploader.getServerApi().listTracks(deviceId);
+                if (!isAdded() || !mapResumed) {
+                    return;
+                }
+                requireActivity().runOnUiThread(() -> {
+                    if (mapResumed) {
+                        updateTrackSpinner(tracks);
+                    }
+                });
+            } catch (Exception ignored) {
+                // optional
+            }
+        });
+    }
+
+    private void updateTrackSpinner(List<TrackInfo> tracks) {
+        if (trackSpinner == null) {
+            return;
+        }
+        savedTracks = tracks != null ? tracks : new ArrayList<>();
+        List<String> labels = new ArrayList<>();
+        labels.add(getString(R.string.track_spinner_hint));
+        for (TrackInfo t : savedTracks) {
+            String start = timeFormat.format(new Date((long) (t.started_at * 1000)));
+            labels.add("#" + t.id + " " + start + " (" + t.point_count + " pts)");
+        }
+        if (savedTracks.isEmpty()) {
+            labels.set(0, getString(R.string.track_none));
+        }
+        suppressTrackSpinner = true;
+        trackSpinner.setAdapter(new ArrayAdapter<>(
+                requireContext(),
+                android.R.layout.simple_spinner_dropdown_item,
+                labels
+        ));
+        trackSpinner.setSelection(0, false);
+        suppressTrackSpinner = false;
+    }
+
+    private void showTrack(long trackId) {
+        executor.execute(() -> {
+            try {
+                TrackDetail detail = uploader.getServerApi().getTrack(trackId);
+                if (!isAdded()) {
+                    return;
+                }
+                requireActivity().runOnUiThread(() ->
+                        runWhenMapReady(() -> drawTrack(detail)));
+            } catch (Exception e) {
+                if (isAdded() && mapStatus != null) {
+                    requireActivity().runOnUiThread(() ->
+                            mapStatus.setText(getString(R.string.track_error, e.getMessage())));
+                }
+            }
+        });
+    }
+
+    private void drawTrack(TrackDetail detail) {
+        if (!isMapReady() || detail.points == null || detail.points.isEmpty()) {
+            return;
+        }
+        clearTrackLayers();
+
+        List<LatLong> line = new ArrayList<>();
+        List<LatLong> boundsPoints = new ArrayList<>();
+
+        for (TrackDetail.TrackPoint p : detail.points) {
+            LatLong latLong = new LatLong(p.lat, p.lon);
+            line.add(latLong);
+            boundsPoints.add(latLong);
+            Marker marker = new Marker(latLong, bitmapTrackPoint, 0, 0);
+            addTrackLayer(marker);
+        }
+
+        if (line.size() >= 2) {
+            Polyline polyline = new Polyline(
+                    MapsforgeBitmaps.linePaint(Color.GREEN, 4f),
+                    AndroidGraphicFactory.INSTANCE
+            );
+            polyline.getLatLongs().addAll(line);
+            addTrackLayer(polyline);
+        }
+
+        fitBoundsOnce(boundsPoints, detail.points.size() == 1, true);
+    }
+
+    private void addTrackLayer(Layer layer) {
+        mapView.getLayerManager().getLayers().add(layer);
+        trackLayers.add(layer);
+    }
+
+    private void clearTrackLayers() {
+        for (Layer layer : trackLayers) {
+            mapView.getLayerManager().getLayers().remove(layer);
+        }
+        trackLayers.clear();
+    }
+
+    private void removeAllDeviceMarkers() {
+        if (mapView == null) {
+            return;
+        }
+        for (Marker marker : deviceMarkers.values()) {
+            mapView.getLayerManager().getLayers().remove(marker);
+        }
+    }
+
+    private Bitmap roleBitmap(String role) {
+        return StatsExtractor.ROLE_RX.equals(role) ? bitmapRx : bitmapTx;
+    }
+
+    private static boolean samePosition(LatLong a, LatLong b) {
+        return Math.abs(a.latitude - b.latitude) < POSITION_EPS
+                && Math.abs(a.longitude - b.longitude) < POSITION_EPS;
+    }
+
+    private boolean isMapReady() {
+        return mapResumed
+                && isAdded()
+                && getView() != null
+                && mapView != null
+                && mapInitialized
+                && pollHelper != null
+                && pollHelper.canRun();
+    }
+
+    private void runWhenMapReady(Runnable action) {
+        if (isMapReady()) {
+            action.run();
+        }
+    }
+
+    private void refreshDevices() {
+        if (!mapResumed || uploader == null) {
+            return;
+        }
+        ServerApi api = uploader.getServerApi();
+        executor.execute(() -> {
+            try {
+                List<DeviceInfo> devices = api.getDevices();
+                if (!isAdded() || !mapResumed) {
+                    return;
+                }
+                requireActivity().runOnUiThread(() ->
+                        runWhenMapReady(() -> updateMap(devices)));
+            } catch (Exception e) {
+                if (!isAdded() || !mapResumed) {
+                    return;
+                }
+                requireActivity().runOnUiThread(() -> {
+                    if (mapStatus != null && pollHelper != null && pollHelper.canRun()) {
+                        mapStatus.setText(getString(R.string.map_error, e.getMessage()));
+                    }
+                });
+            }
+            if (pollHelper != null && pollHelper.canRun()) {
+                pollHelper.scheduleNext(DEVICE_POLL_MS);
+            }
+        });
+    }
+
+    private void updateMap(List<DeviceInfo> devices) {
+        if (!isMapReady()) {
+            return;
+        }
+
+        int txCount = 0;
+        int rxCount = 0;
+        int onMap = 0;
+        List<LatLong> boundsPoints = new ArrayList<>();
+        Set<String> seen = new HashSet<>();
+
+        for (DeviceInfo d : devices) {
+            if (StatsExtractor.ROLE_TX.equals(d.role)) {
+                txCount++;
+            } else if (StatsExtractor.ROLE_RX.equals(d.role)) {
+                rxCount++;
+            }
+            if (!GeoUtils.isValidCoordinate(d.lat, d.lon)) {
+                continue;
+            }
+            onMap++;
+            seen.add(d.device_id);
+            LatLong pos = new LatLong(d.lat, d.lon);
+            boundsPoints.add(pos);
+
+            Marker marker = deviceMarkers.get(d.device_id);
+            if (marker == null) {
+                marker = new Marker(pos, roleBitmap(d.role), 0, 0);
+                deviceMarkers.put(d.device_id, marker);
+                mapView.getLayerManager().getLayers().add(marker);
+            } else if (!samePosition(marker.getLatLong(), pos)) {
+                marker.setLatLong(pos);
+            }
+        }
+
+        Iterator<Map.Entry<String, Marker>> it = deviceMarkers.entrySet().iterator();
+        while (it.hasNext()) {
+            Map.Entry<String, Marker> entry = it.next();
+            if (!seen.contains(entry.getKey())) {
+                mapView.getLayerManager().getLayers().remove(entry.getValue());
+                it.remove();
+            }
+        }
+
+        if (mapStatus != null) {
+            mapStatus.setText(getString(
+                    R.string.map_status_roles,
+                    onMap,
+                    txCount,
+                    rxCount,
+                    networkStatusSuffix()
+            ));
+        }
+
+        if (!boundsPoints.isEmpty() && !userMovedMap && !initialFitDone) {
+            fitBoundsOnce(boundsPoints, onMap == 1, false);
+            initialFitDone = true;
+        }
+    }
+
+    /** Adjust camera only on first device load or when user picks a saved track. */
+    private void fitBoundsOnce(List<LatLong> points, boolean singlePoint, boolean force) {
+        if (!isMapReady() || points.isEmpty() || (!force && userMovedMap)) {
+            return;
+        }
+        MapViewPosition position = (MapViewPosition) mapView.getModel().mapViewPosition;
+        Runnable apply = () -> {
+            if (!isMapReady()) {
+                return;
+            }
+            if (singlePoint) {
+                position.setCenter(points.get(0));
+                position.setZoomLevel((byte) 13);
+                return;
+            }
+            double minLat = Double.MAX_VALUE;
+            double maxLat = -Double.MAX_VALUE;
+            double minLon = Double.MAX_VALUE;
+            double maxLon = -Double.MAX_VALUE;
+            for (LatLong p : points) {
+                minLat = Math.min(minLat, p.latitude);
+                maxLat = Math.max(maxLat, p.latitude);
+                minLon = Math.min(minLon, p.longitude);
+                maxLon = Math.max(maxLon, p.longitude);
+            }
+            double padLat = Math.max((maxLat - minLat) * 0.2, 0.003);
+            double padLon = Math.max((maxLon - minLon) * 0.2, 0.003);
+            BoundingBox box = new BoundingBox(
+                    minLat - padLat, minLon - padLon, maxLat + padLat, maxLon + padLon);
+            position.setCenter(box.getCenterPoint());
+            int w = Math.max(mapView.getWidth(), 1);
+            int h = Math.max(mapView.getHeight(), 1);
+            double latSpan = Math.max(box.maxLatitude - box.minLatitude, 0.001);
+            double lonSpan = Math.max(box.maxLongitude - box.minLongitude, 0.001);
+            double latZoom = Math.log(h / (double) TILE_SIZE_PX / latSpan) / Math.log(2);
+            double lonZoom = Math.log(w / (double) TILE_SIZE_PX / lonSpan) / Math.log(2);
+            byte zoom = (byte) Math.max(8, Math.min(15, Math.floor(Math.min(latZoom, lonZoom))));
+            position.setZoomLevel(zoom);
+        };
+        if (mapView.getWidth() > 0 && mapView.getHeight() > 0) {
+            apply.run();
+        } else {
+            mapView.post(apply);
+        }
+    }
+}

app/src/main/java/com/grigowashere/loratester/ui/MapsforgeBitmaps.java

@@ -0,0 +1,38 @@
+package com.grigowashere.loratester.ui;
+
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Paint;
+
+import org.mapsforge.core.graphics.Color;
+import org.mapsforge.map.android.graphics.AndroidBitmap;
+import org.mapsforge.map.android.graphics.AndroidGraphicFactory;
+
+/** Small colored bitmaps for device/track markers on Mapsforge. */
+final class MapsforgeBitmaps {
+
+    private MapsforgeBitmaps() {
+    }
+
+    static org.mapsforge.core.graphics.Bitmap dot(int argb, int sizePx) {
+        Bitmap androidBitmap = Bitmap.createBitmap(sizePx, sizePx, Bitmap.Config.ARGB_8888);
+        Canvas canvas = new Canvas(androidBitmap);
+        Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
+        paint.setColor(argb);
+        canvas.drawCircle(sizePx / 2f, sizePx / 2f, sizePx / 2f - 1f, paint);
+        Paint stroke = new Paint(Paint.ANTI_ALIAS_FLAG);
+        stroke.setStyle(Paint.Style.STROKE);
+        stroke.setColor(0xFFFFFFFF);
+        stroke.setStrokeWidth(2f);
+        canvas.drawCircle(sizePx / 2f, sizePx / 2f, sizePx / 2f - 2f, stroke);
+        return new AndroidBitmap(androidBitmap);
+    }
+
+    static org.mapsforge.core.graphics.Paint linePaint(Color color, float strokeWidth) {
+        org.mapsforge.core.graphics.Paint paint = AndroidGraphicFactory.INSTANCE.createPaint();
+        paint.setColor(color);
+        paint.setStrokeWidth(strokeWidth);
+        paint.setStyle(org.mapsforge.core.graphics.Style.STROKE);
+        return paint;
+    }
+}

app/src/main/java/com/grigowashere/loratester/ui/SettingsFragment.java

@@ -0,0 +1,84 @@
+package com.grigowashere.loratester.ui;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+
+import com.google.android.material.switchmaterial.SwitchMaterial;
+import com.google.android.material.textfield.TextInputEditText;
+import com.grigowashere.loratester.LoraApp;
+import com.grigowashere.loratester.R;
+import com.grigowashere.loratester.SettingsRepository;
+import com.grigowashere.loratester.TelemetryUploader;
+
+public class SettingsFragment extends Fragment {
+
+    @Nullable
+    @Override
+    public View onCreateView(
+            @NonNull LayoutInflater inflater,
+            @Nullable ViewGroup container,
+            @Nullable Bundle savedInstanceState
+    ) {
+        return inflater.inflate(R.layout.fragment_settings, container, false);
+    }
+
+    @Override
+    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
+        LoraApp app = (LoraApp) requireActivity().getApplication();
+        SettingsRepository settings = app.getSettingsRepository();
+        TelemetryUploader uploader = app.getTelemetryUploader();
+
+        TextInputEditText editServer = view.findViewById(R.id.editServerUrl);
+        TextInputEditText editHost = view.findViewById(R.id.editTelnetHost);
+        TextInputEditText editPort = view.findViewById(R.id.editTelnetPort);
+        TextInputEditText editRssi = view.findViewById(R.id.editRssiRegex);
+        TextInputEditText editRange = view.findViewById(R.id.editRangeRegex);
+        SwitchMaterial switchTelnet = view.findViewById(R.id.switchTelnet);
+        TextView deviceIdLabel = view.findViewById(R.id.deviceIdLabel);
+        Button save = view.findViewById(R.id.btnSaveSettings);
+
+        editServer.setText(settings.getServerUrl());
+        editHost.setText(settings.getTelnetHost());
+        editPort.setText(String.valueOf(settings.getTelnetPort()));
+        editRssi.setText(settings.getRssiRegex());
+        editRange.setText(settings.getRangeRegex());
+        switchTelnet.setChecked(settings.isTelnetEnabled());
+        deviceIdLabel.setText(getString(R.string.device_id_label, settings.getOrCreateDeviceId()));
+
+        save.setOnClickListener(v -> {
+            settings.setServerUrl(textOf(editServer, SettingsRepository.DEFAULT_SERVER));
+            settings.setTelnetHost(textOf(editHost, SettingsRepository.DEFAULT_TELNET_HOST));
+            try {
+                settings.setTelnetPort(Integer.parseInt(textOf(editPort, "2727")));
+            } catch (NumberFormatException e) {
+                settings.setTelnetPort(SettingsRepository.DEFAULT_TELNET_PORT);
+            }
+            settings.setRssiRegex(textOf(editRssi, SettingsRepository.DEFAULT_RSSI_REGEX));
+            settings.setRangeRegex(textOf(editRange, SettingsRepository.DEFAULT_RANGE_REGEX));
+            settings.setTelnetEnabled(switchTelnet.isChecked());
+            uploader.refreshApi();
+            if (switchTelnet.isChecked()) {
+                uploader.startTelnet();
+            } else {
+                uploader.stopTelnet();
+            }
+            Toast.makeText(requireContext(), R.string.saved, Toast.LENGTH_SHORT).show();
+        });
+    }
+
+    private static String textOf(TextInputEditText edit, String fallback) {
+        if (edit.getText() == null || edit.getText().toString().trim().isEmpty()) {
+            return fallback;
+        }
+        return edit.getText().toString().trim();
+    }
+}

app/src/main/java/com/grigowashere/loratester/ui/StatsFragment.java

@@ -0,0 +1,379 @@
+package com.grigowashere.loratester.ui;
+
+import android.content.Context;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+
+import com.grigowashere.loratester.CommandPoller;
+import com.grigowashere.loratester.LoraApp;
+import com.grigowashere.loratester.PeerDevices;
+import com.grigowashere.loratester.PeerStatsCache;
+import com.grigowashere.loratester.R;
+import com.grigowashere.loratester.TelemetryUploader;
+import com.grigowashere.loratester.api.DeviceInfo;
+import com.grigowashere.loratester.api.TelemetryHistoryItem;
+import com.grigowashere.loratester.location.GeoUtils;
+import com.grigowashere.loratester.telnet.LoraStatsFormatter;
+import com.grigowashere.loratester.telnet.StatsExtractor;
+
+import java.text.DateFormat;
+import java.util.Date;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+public class StatsFragment extends Fragment {
+
+    private static final long SERVER_POLL_MS = 1000;
+
+    private final ExecutorService executor = Executors.newSingleThreadExecutor();
+    private final DateFormat timeFormat =
+            DateFormat.getTimeInstance(DateFormat.MEDIUM, Locale.getDefault());
+    private FragmentPollHelper pollHelper;
+    private TelemetryUploader uploader;
+    private CommandPoller commandPoller;
+    private PeerStatsCache peerStatsCache;
+    private TextView statsStatus;
+    private TextView statsPeerWarning;
+    private TextView statsLocalDetails;
+    private TextView statsPeerDetails;
+    private RecyclerView statsHistoryList;
+    private final HistoryAdapter historyAdapter = new HistoryAdapter();
+
+    private StatsExtractor.ExtractedStats cachedLocal;
+    private DeviceInfo cachedServer;
+    private DeviceInfo cachedPeer;
+    private int cachedDeviceCount;
+    private String cachedPeerId;
+    private String cachedPeerError;
+    private String cachedError;
+
+    private final TelemetryUploader.StatsListener statsListener = stats -> {
+        cachedLocal = stats;
+        cachedError = null;
+        postRender();
+    };
+
+    @Override
+    public void onAttach(@NonNull Context context) {
+        super.onAttach(context);
+        LoraApp app = (LoraApp) context.getApplicationContext();
+        uploader = app.getTelemetryUploader();
+        commandPoller = app.getCommandPoller();
+        peerStatsCache = app.getPeerStatsCache();
+    }
+
+    @Nullable
+    @Override
+    public View onCreateView(
+            @NonNull LayoutInflater inflater,
+            @Nullable ViewGroup container,
+            @Nullable Bundle savedInstanceState
+    ) {
+        return inflater.inflate(R.layout.fragment_stats, container, false);
+    }
+
+    @Override
+    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
+        statsStatus = view.findViewById(R.id.statsStatus);
+        statsPeerWarning = view.findViewById(R.id.statsPeerWarning);
+        statsLocalDetails = view.findViewById(R.id.statsLocalDetails);
+        statsPeerDetails = view.findViewById(R.id.statsPeerDetails);
+        statsHistoryList = view.findViewById(R.id.statsHistoryList);
+        statsHistoryList.setLayoutManager(new LinearLayoutManager(requireContext()));
+        statsHistoryList.setAdapter(historyAdapter);
+        Button btnSimulate = view.findViewById(R.id.btnSimulate);
+        Button btnPushStats = view.findViewById(R.id.btnPushStats);
+        Button btnModeTx = view.findViewById(R.id.btnModeTxPeer);
+        Button btnModeRx = view.findViewById(R.id.btnModeRxPeer);
+        pollHelper = new FragmentPollHelper(this, this::refresh);
+
+        btnSimulate.setOnClickListener(v -> {
+            String chunk = """
+                    SEND
+                    Frequency:         433000000 Hz
+                    Power:             22 dBm
+                    Packet:            1
+                    Payload:           Sim TX
+                    \u001b[2J""";
+            uploader.simulateChunk(chunk);
+            if (pollHelper.canRun()) {
+                statsStatus.setText(R.string.simulate_sent);
+            }
+        });
+
+        btnPushStats.setOnClickListener(v -> pushStatsToPeer());
+        btnModeTx.setOnClickListener(v -> sendModeToPeer("TX"));
+        btnModeRx.setOnClickListener(v -> sendModeToPeer("RX"));
+    }
+
+    private void pushStatsToPeer() {
+        if (commandPoller == null || cachedPeerId == null) {
+            toast(R.string.at_peer_unavailable);
+            return;
+        }
+        Map<String, Object> payload = new HashMap<>();
+        String meta = pickMetaJson(true);
+        if (meta != null) {
+            payload.put("meta", meta);
+        }
+        Double rssi = pickRssi(true);
+        if (rssi != null) {
+            payload.put("rssi", rssi);
+        }
+        if (cachedLocal != null && cachedLocal.role != null) {
+            payload.put("role", cachedLocal.role);
+        } else if (cachedServer != null && cachedServer.role != null) {
+            payload.put("role", cachedServer.role);
+        }
+        commandPoller.postCommandToPeer(cachedPeerId, "stats_push", payload);
+        toast(R.string.stats_pushed);
+    }
+
+    private void sendModeToPeer(String role) {
+        if (commandPoller == null || cachedPeerId == null) {
+            toast(R.string.at_peer_unavailable);
+            return;
+        }
+        Map<String, Object> payload = new HashMap<>();
+        payload.put("role", role);
+        commandPoller.postCommandToPeer(cachedPeerId, "mode", payload);
+        toast(R.string.stats_pushed);
+    }
+
+    private void toast(int resId) {
+        if (isAdded()) {
+            Toast.makeText(requireContext(), resId, Toast.LENGTH_SHORT).show();
+        }
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        if (uploader != null) {
+            uploader.setStatsListener(statsListener);
+            cachedLocal = uploader.getLastStats();
+            postRender();
+        }
+        if (pollHelper != null) {
+            pollHelper.start(0);
+        }
+    }
+
+    @Override
+    public void onPause() {
+        if (uploader != null) {
+            uploader.setStatsListener(null);
+        }
+        if (pollHelper != null) {
+            pollHelper.stop();
+        }
+        super.onPause();
+    }
+
+    @Override
+    public void onDestroyView() {
+        if (pollHelper != null) {
+            pollHelper.stop();
+        }
+        statsStatus = null;
+        statsPeerWarning = null;
+        statsLocalDetails = null;
+        statsPeerDetails = null;
+        statsHistoryList = null;
+        pollHelper = null;
+        super.onDestroyView();
+    }
+
+    @Override
+    public void onDestroy() {
+        executor.shutdownNow();
+        super.onDestroy();
+    }
+
+    private void postRender() {
+        if (!isAdded() || statsLocalDetails == null) {
+            return;
+        }
+        requireActivity().runOnUiThread(this::renderDetails);
+    }
+
+    private void refresh() {
+        if (!pollHelper.canRun() || uploader == null || statsStatus == null) {
+            return;
+        }
+        String deviceId = uploader.getDeviceId();
+        boolean telnet = uploader.isTelnetConnected();
+        statsStatus.setText(getString(
+                R.string.stats_status,
+                deviceId,
+                telnet ? getString(R.string.connected) : getString(R.string.disconnected)
+        ));
+
+        executor.execute(() -> {
+            List<TelemetryHistoryItem> history = null;
+            try {
+                List<DeviceInfo> devices = uploader.getServerApi().getDevices();
+                cachedDeviceCount = devices.size();
+                PeerDevices.Result peer = PeerDevices.resolve(devices, deviceId);
+                cachedPeerId = peer.peerId;
+                cachedPeerError = peer.error;
+                cachedPeer = null;
+                cachedServer = null;
+                for (DeviceInfo d : devices) {
+                    if (deviceId.equals(d.device_id)) {
+                        cachedServer = d;
+                    } else if (peer.peerId != null && peer.peerId.equals(d.device_id)) {
+                        cachedPeer = d;
+                    }
+                }
+                cachedError = null;
+                history = uploader.getServerApi().getTelemetryHistory(deviceId, 30);
+            } catch (Exception e) {
+                cachedError = e.getMessage() != null ? e.getMessage() : "error";
+            }
+            List<TelemetryHistoryItem> finalHistory = history;
+            if (isAdded()) {
+                requireActivity().runOnUiThread(() -> {
+                    if (historyAdapter != null) {
+                        historyAdapter.setItems(finalHistory);
+                    }
+                });
+            }
+            postRender();
+            if (pollHelper != null) {
+                pollHelper.scheduleNext(SERVER_POLL_MS);
+            }
+        });
+    }
+
+    private void renderDetails() {
+        if (!isAdded() || statsLocalDetails == null || uploader == null) {
+            return;
+        }
+
+        if (statsPeerWarning != null) {
+            if (cachedPeerError != null) {
+                statsPeerWarning.setVisibility(View.VISIBLE);
+                statsPeerWarning.setText(
+                        getString(R.string.stats_two_devices_required, cachedDeviceCount));
+            } else {
+                statsPeerWarning.setVisibility(View.GONE);
+            }
+        }
+
+        statsLocalDetails.setText(formatDeviceBlock(true));
+        statsPeerDetails.setText(formatDeviceBlock(false));
+    }
+
+    private CharSequence formatDeviceBlock(boolean local) {
+        StringBuilder sb = new StringBuilder();
+        if (local) {
+            sb.append(uploader.isTelnetConnected()
+                    ? getString(R.string.telnet_connected)
+                    : getString(R.string.telnet_disconnected));
+            long at = uploader.getLastStatsAtMs();
+            if (at > 0) {
+                sb.append(" · ").append(timeFormat.format(new Date(at)));
+            }
+            sb.append("\n\n");
+            appendStatsBody(sb, pickMetaJson(true), pickRssi(true), cachedServer, true);
+        } else {
+            if (cachedPeerId == null) {
+                sb.append(getString(R.string.stats_peer_absent));
+                return sb;
+            }
+            sb.append(cachedPeerId);
+            if (cachedPeer != null && cachedPeer.role != null) {
+                sb.append(" · ").append(cachedPeer.role);
+            }
+            sb.append("\n\n");
+            PeerStatsCache.Snapshot push = peerStatsCache != null ? peerStatsCache.get() : null;
+            if (push != null && push.meta != null) {
+                appendStatsBody(sb, push.meta, push.rssi, cachedPeer, false);
+            } else if (cachedPeer != null) {
+                appendStatsBody(sb, cachedPeer.meta, cachedPeer.rssi, cachedPeer, false);
+            } else {
+                sb.append(getString(R.string.no_telemetry_yet));
+            }
+        }
+        return sb;
+    }
+
+    private void appendStatsBody(
+            StringBuilder sb,
+            String meta,
+            Double rssi,
+            DeviceInfo gpsSource,
+            boolean local
+    ) {
+        if (meta != null && !meta.isEmpty()) {
+            String fields = LoraStatsFormatter.formatMeta(meta);
+            if (!fields.isEmpty()) {
+                sb.append(fields).append("\n");
+            }
+        } else if (local && cachedError != null) {
+            sb.append(getString(R.string.stats_error, cachedError)).append("\n");
+        } else if (local) {
+            sb.append(getString(R.string.no_telemetry_yet)).append("\n");
+        }
+        sb.append("\nСигнал (dBm): ").append(rssi != null ? rssi : "—").append("\n");
+        Double lat = null;
+        Double lon = null;
+        if (gpsSource != null) {
+            lat = gpsSource.lat;
+            lon = gpsSource.lon;
+        }
+        if (GeoUtils.isValidCoordinate(lat, lon)) {
+            sb.append("GPS: ").append(lat).append(", ").append(lon).append("\n");
+        } else {
+            sb.append(getString(R.string.gps_waiting)).append("\n");
+        }
+    }
+
+    private String pickMetaJson(boolean local) {
+        if (local) {
+            boolean telnet = uploader.isTelnetConnected();
+            if (telnet && cachedLocal != null && cachedLocal.metaJson != null) {
+                return cachedLocal.metaJson;
+            }
+            if (cachedServer != null && cachedServer.meta != null && !cachedServer.meta.isEmpty()) {
+                return cachedServer.meta;
+            }
+            if (cachedLocal != null && cachedLocal.metaJson != null) {
+                return cachedLocal.metaJson;
+            }
+        }
+        return null;
+    }
+
+    private Double pickRssi(boolean local) {
+        if (local) {
+            boolean telnet = uploader.isTelnetConnected();
+            if (telnet && cachedLocal != null && cachedLocal.rssi != null) {
+                return cachedLocal.rssi;
+            }
+            if (cachedServer != null && cachedServer.rssi != null) {
+                return cachedServer.rssi;
+            }
+            if (cachedLocal != null) {
+                return cachedLocal.rssi;
+            }
+        }
+        return null;
+    }
+}

app/src/main/res/drawable/ic_launcher_background.xml

@@ -0,0 +1,170 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillColor="#3DDC84"
+        android:pathData="M0,0h108v108h-108z" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M9,0L9,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,0L19,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,0L29,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,0L39,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,0L49,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,0L59,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,0L69,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,0L79,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M89,0L89,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M99,0L99,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,9L108,9"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,19L108,19"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,29L108,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,39L108,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,49L108,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,59L108,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,69L108,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,79L108,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,89L108,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,99L108,99"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,29L89,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,39L89,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,49L89,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,59L89,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,69L89,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,79L89,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,19L29,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,19L39,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,19L49,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,19L59,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,19L69,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,19L79,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+</vector>

app/src/main/res/drawable/ic_launcher_foreground.xml

@@ -0,0 +1,30 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path android:pathData="M31,63.928c0,0 6.4,-11 12.1,-13.1c7.2,-2.6 26,-1.4 26,-1.4l38.1,38.1L107,108.928l-32,-1L31,63.928z">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="85.84757"
+                android:endY="92.4963"
+                android:startX="42.9492"
+                android:startY="49.59793"
+                android:type="linear">
+                <item
+                    android:color="#44000000"
+                    android:offset="0.0" />
+                <item
+                    android:color="#00000000"
+                    android:offset="1.0" />
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+        android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        android:pathData="M65.3,45.828l3.8,-6.6c0.2,-0.4 0.1,-0.9 -0.3,-1.1c-0.4,-0.2 -0.9,-0.1 -1.1,0.3l-3.9,6.7c-6.3,-2.8 -13.4,-2.8 -19.7,0l-3.9,-6.7c-0.2,-0.4 -0.7,-0.5 -1.1,-0.3C38.8,38.328 38.7,38.828 38.9,39.228l3.8,6.6C36.2,49.428 31.7,56.028 31,63.928h46C76.3,56.028 71.8,49.428 65.3,45.828zM43.4,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2c-0.3,-0.7 -0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C45.3,56.528 44.5,57.328 43.4,57.328L43.4,57.328zM64.6,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2s-0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C66.5,56.528 65.6,57.328 64.6,57.328L64.6,57.328z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000" />
+</vector>

app/src/main/res/drawable/ic_marker.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="oval">
+    <size
+        android:width="16dp"
+        android:height="16dp" />
+    <solid android:color="#E94560" />
+</shape>

app/src/main/res/drawable/ic_marker_rx.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="oval">
+    <size
+        android:width="18dp"
+        android:height="18dp" />
+    <solid android:color="#4FC3F7" />
+    <stroke
+        android:width="2dp"
+        android:color="#FFFFFF" />
+</shape>

app/src/main/res/drawable/ic_marker_tx.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="oval">
+    <size
+        android:width="18dp"
+        android:height="18dp" />
+    <solid android:color="#E94560" />
+    <stroke
+        android:width="2dp"
+        android:color="#FFFFFF" />
+</shape>

app/src/main/res/layout/activity_main.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/main"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical">
+
+    <com.google.android.material.tabs.TabLayout
+        android:id="@+id/tabLayout"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        app:tabMode="scrollable" />
+
+    <androidx.viewpager2.widget.ViewPager2
+        android:id="@+id/viewPager"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:layout_weight="1" />
+
+</LinearLayout>

app/src/main/res/layout/fragment_at.xml

@@ -0,0 +1,109 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:padding="12dp">
+
+    <TextView
+        android:id="@+id/atStatus"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:textSize="14sp" />
+
+    <com.google.android.material.button.MaterialButtonToggleGroup
+        android:id="@+id/atTargetGroup"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="6dp"
+        app:singleSelection="true"
+        app:selectionRequired="true">
+
+        <com.google.android.material.button.MaterialButton
+            android:id="@+id/atTargetLocal"
+            style="@style/Widget.Material3.Button.OutlinedButton"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:text="@string/at_target_local"
+            android:checked="true" />
+
+        <com.google.android.material.button.MaterialButton
+            android:id="@+id/atTargetPeer"
+            style="@style/Widget.Material3.Button.OutlinedButton"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:text="@string/at_target_peer" />
+    </com.google.android.material.button.MaterialButtonToggleGroup>
+
+    <com.google.android.material.chip.ChipGroup
+        android:id="@+id/atQuickChips"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="8dp" />
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="8dp"
+        android:orientation="horizontal">
+
+        <com.google.android.material.textfield.TextInputLayout
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:hint="@string/at_command_hint">
+
+            <com.google.android.material.textfield.TextInputEditText
+                android:id="@+id/atCommandInput"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:fontFamily="monospace"
+                android:inputType="text"
+                android:singleLine="true" />
+        </com.google.android.material.textfield.TextInputLayout>
+
+        <Button
+            android:id="@+id/atSendBtn"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_vertical"
+            android:layout_marginStart="8dp"
+            android:text="@string/send" />
+    </LinearLayout>
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="4dp"
+        android:orientation="horizontal">
+
+        <Button
+            android:id="@+id/atClearLog"
+            style="@style/Widget.Material3.Button.TextButton"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/at_clear_log" />
+    </LinearLayout>
+
+    <ScrollView
+        android:id="@+id/atConsoleScroll"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:layout_marginTop="8dp"
+        android:layout_weight="1"
+        android:background="#0D1117"
+        android:padding="8dp">
+
+        <TextView
+            android:id="@+id/atConsole"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:fontFamily="monospace"
+            android:textColor="#C9D1D9"
+            android:textIsSelectable="true"
+            android:textSize="11sp" />
+    </ScrollView>
+</LinearLayout>

app/src/main/res/layout/fragment_chat.xml

@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/chatRoot"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:paddingHorizontal="8dp"
+    android:paddingTop="8dp">
+
+    <androidx.recyclerview.widget.RecyclerView
+        android:id="@+id/chatRecycler"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:layout_weight="1"
+        android:clipToPadding="false"
+        android:paddingBottom="4dp" />
+
+    <LinearLayout
+        android:id="@+id/chatInputBar"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal"
+        android:paddingBottom="8dp">
+
+        <EditText
+            android:id="@+id/chatInput"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:hint="@string/chat_hint"
+            android:imeOptions="actionSend"
+            android:inputType="textCapSentences" />
+
+        <Button
+            android:id="@+id/chatSend"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/send" />
+    </LinearLayout>
+</LinearLayout>

app/src/main/res/layout/fragment_map.xml

@@ -0,0 +1,79 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <org.mapsforge.map.android.view.MapView
+        android:id="@+id/mapView"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+    <ScrollView
+        android:id="@+id/mapSidePanel"
+        android:layout_width="152dp"
+        android:layout_height="wrap_content"
+        android:layout_gravity="end|top"
+        android:layout_margin="6dp"
+        android:background="#CC0F3460"
+        android:elevation="4dp"
+        android:fillViewport="false"
+        android:scrollbars="none">
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="vertical"
+            android:padding="6dp">
+
+            <TextView
+                android:id="@+id/mapStatus"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:textColor="#FFFFFF"
+                android:textSize="10sp" />
+
+            <TextView
+                android:id="@+id/mapLegend"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="2dp"
+                android:text="@string/map_legend"
+                android:textColor="#CCCCCC"
+                android:textSize="9sp" />
+
+            <Button
+                android:id="@+id/btnTrack"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="4dp"
+                android:minHeight="36dp"
+                android:text="@string/track_start"
+                android:textSize="11sp" />
+
+            <Button
+                android:id="@+id/btnPairedTrack"
+                style="@style/Widget.Material3.Button.TonalButton"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="4dp"
+                android:minHeight="36dp"
+                android:text="@string/track_paired_start"
+                android:textSize="11sp" />
+
+            <TextView
+                android:id="@+id/trackStatus"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="2dp"
+                android:textColor="#CCCCCC"
+                android:textSize="9sp" />
+
+            <Spinner
+                android:id="@+id/trackSpinner"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="4dp" />
+        </LinearLayout>
+    </ScrollView>
+
+</FrameLayout>

app/src/main/res/layout/fragment_settings.xml

@@ -0,0 +1,97 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:padding="16dp">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="vertical">
+
+        <com.google.android.material.textfield.TextInputLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:hint="@string/server_url">
+
+            <com.google.android.material.textfield.TextInputEditText
+                android:id="@+id/editServerUrl"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:inputType="textUri" />
+        </com.google.android.material.textfield.TextInputLayout>
+
+        <com.google.android.material.textfield.TextInputLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:hint="@string/telnet_host">
+
+            <com.google.android.material.textfield.TextInputEditText
+                android:id="@+id/editTelnetHost"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:inputType="text" />
+        </com.google.android.material.textfield.TextInputLayout>
+
+        <com.google.android.material.textfield.TextInputLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:hint="@string/telnet_port">
+
+            <com.google.android.material.textfield.TextInputEditText
+                android:id="@+id/editTelnetPort"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:inputType="number" />
+        </com.google.android.material.textfield.TextInputLayout>
+
+        <com.google.android.material.textfield.TextInputLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:hint="@string/rssi_regex">
+
+            <com.google.android.material.textfield.TextInputEditText
+                android:id="@+id/editRssiRegex"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:inputType="text" />
+        </com.google.android.material.textfield.TextInputLayout>
+
+        <com.google.android.material.textfield.TextInputLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:hint="@string/range_regex">
+
+            <com.google.android.material.textfield.TextInputEditText
+                android:id="@+id/editRangeRegex"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:inputType="text" />
+        </com.google.android.material.textfield.TextInputLayout>
+
+        <com.google.android.material.switchmaterial.SwitchMaterial
+            android:id="@+id/switchTelnet"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="16dp"
+            android:text="@string/telnet_enabled" />
+
+        <TextView
+            android:id="@+id/deviceIdLabel"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:textSize="12sp" />
+
+        <Button
+            android:id="@+id/btnSaveSettings"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="16dp"
+            android:text="@string/save" />
+    </LinearLayout>
+</ScrollView>

app/src/main/res/layout/fragment_stats.xml

@@ -0,0 +1,133 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:padding="16dp">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="vertical">
+
+        <TextView
+            android:id="@+id/statsStatus"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:textSize="14sp" />
+
+        <TextView
+            android:id="@+id/statsPeerWarning"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="4dp"
+            android:textColor="#FF9800"
+            android:textSize="12sp"
+            android:visibility="gone" />
+
+        <Button
+            android:id="@+id/btnSimulate"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:text="@string/simulate_telnet" />
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:orientation="horizontal">
+
+            <LinearLayout
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:orientation="vertical"
+                android:paddingEnd="6dp">
+
+                <TextView
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:text="@string/stats_local_title"
+                    android:textSize="13sp"
+                    android:textStyle="bold" />
+
+                <TextView
+                    android:id="@+id/statsLocalDetails"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="4dp"
+                    android:fontFamily="monospace"
+                    android:textSize="11sp" />
+            </LinearLayout>
+
+            <LinearLayout
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:orientation="vertical"
+                android:paddingStart="6dp">
+
+                <TextView
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:text="@string/stats_peer_title"
+                    android:textSize="13sp"
+                    android:textStyle="bold" />
+
+                <TextView
+                    android:id="@+id/statsPeerDetails"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="4dp"
+                    android:fontFamily="monospace"
+                    android:textSize="11sp" />
+            </LinearLayout>
+        </LinearLayout>
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:orientation="horizontal">
+
+            <Button
+                android:id="@+id/btnPushStats"
+                style="@style/Widget.Material3.Button.TonalButton"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_marginEnd="4dp"
+                android:layout_weight="1"
+                android:text="@string/stats_push_peer" />
+
+            <Button
+                android:id="@+id/btnModeTxPeer"
+                style="@style/Widget.Material3.Button.OutlinedButton"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="TX→" />
+
+            <Button
+                android:id="@+id/btnModeRxPeer"
+                style="@style/Widget.Material3.Button.OutlinedButton"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginStart="4dp"
+                android:text="RX→" />
+        </LinearLayout>
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="16dp"
+            android:text="@string/stats_history_title"
+            android:textSize="14sp"
+            android:textStyle="bold" />
+
+        <androidx.recyclerview.widget.RecyclerView
+            android:id="@+id/statsHistoryList"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:nestedScrollingEnabled="false" />
+
+    </LinearLayout>
+</ScrollView>

app/src/main/res/layout/item_chat.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<TextView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/chatItemText"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:padding="6dp"
+    android:textSize="13sp" />

app/src/main/res/layout/item_history.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<TextView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/historyLine"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:fontFamily="monospace"
+    android:paddingVertical="4dp"
+    android:textSize="11sp" />

app/src/main/res/mipmap-anydpi/ic_launcher.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+    <monochrome android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

app/src/main/res/mipmap-anydpi/ic_launcher_round.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+    <monochrome android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

app/src/main/res/values-night/themes.xml

@@ -0,0 +1,7 @@
+<resources xmlns:tools="http://schemas.android.com/tools">
+    <!-- Base application theme. -->
+    <style name="Base.Theme.LoraTester" parent="Theme.Material3.DayNight.NoActionBar">
+        <!-- Customize your dark theme here. -->
+        <!-- <item name="colorPrimary">@color/my_dark_primary</item> -->
+    </style>
+</resources>

app/src/main/res/values/colors.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="black">#FF000000</color>
+    <color name="white">#FFFFFFFF</color>
+</resources>

app/src/main/res/values/strings.xml

@@ -0,0 +1,66 @@
+<resources>
+    <string name="app_name">LoraTester</string>
+    <string name="tab_map">Карта</string>
+    <string name="tab_stats">Статистика</string>
+    <string name="tab_at">AT</string>
+    <string name="tab_chat">Чат</string>
+    <string name="tab_settings">Настройки</string>
+    <string name="at_status">Telnet: %1$s</string>
+    <string name="at_command_hint">AT+TX или +H …</string>
+    <string name="at_clear_log">Очистить лог</string>
+    <string name="at_not_connected">Telnet не подключён. Включите в Настройках.</string>
+    <string name="at_send_error">Ошибка отправки команды</string>
+    <string name="server_url">URL сервера</string>
+    <string name="telnet_host">Telnet host</string>
+    <string name="telnet_port">Telnet port</string>
+    <string name="rssi_regex">RSSI regex</string>
+    <string name="range_regex">Range regex</string>
+    <string name="telnet_enabled">Подключить telnet</string>
+    <string name="device_id_label">ID устройства: %1$s</string>
+    <string name="save">Сохранить</string>
+    <string name="saved">Сохранено</string>
+    <string name="chat_hint">Сообщение…</string>
+    <string name="send">Отправить</string>
+    <string name="simulate_telnet">Симуляция телнет-кадра</string>
+    <string name="simulate_sent">Кадр отправлен на сервер</string>
+    <string name="stats_status">%1$s · Telnet: %2$s</string>
+    <string name="connected">подключён</string>
+    <string name="disconnected">нет</string>
+    <string name="devices_on_server">Устройств на сервере: %1$d</string>
+    <string name="no_telemetry_yet">Телеметрия ещё не получена. Нажмите «Симуляция» или включите telnet.</string>
+    <string name="stats_error">Ошибка: %1$s</string>
+    <string name="map_error">Ошибка карты: %1$s</string>
+    <string name="devices_label">устройств</string>
+    <string name="map_legend">● красный — передатчик (TX)   ● голубой — приёмник (RX)</string>
+    <string name="map_status_roles">На карте: %1$d · TX: %2$d · RX: %3$d · %4$s</string>
+    <string name="map_network_online">онлайн</string>
+    <string name="map_network_offline">офлайн (кэш)</string>
+    <string name="track_need_network">Нужна сеть для начала трека</string>
+    <string name="upload_queue_pending">В очереди: %1$d</string>
+    <string name="gps_waiting">GPS: ожидание фикса…</string>
+    <string name="stats_updated_at">обновлено %1$s</string>
+    <string name="telnet_connected">Telnet: подключён</string>
+    <string name="telnet_disconnected">Telnet: нет</string>
+    <string name="stats_history_title">История (сервер)</string>
+    <string name="track_start">Начать трекинг пути</string>
+    <string name="track_stop">Остановить трекинг</string>
+    <string name="track_status">Трекинг: %1$d точек</string>
+    <string name="track_saved">Трек #%1$d сохранён (%2$d точек)</string>
+    <string name="track_error">Трек: %1$s</string>
+    <string name="track_spinner_hint">Сохранённые треки</string>
+    <string name="track_none">— нет треков —</string>
+    <string name="stats_local_title">Это устройство</string>
+    <string name="stats_peer_title">Другое устройство</string>
+    <string name="stats_peer_absent">Нет данных (ожидается 2 устройства online)</string>
+    <string name="stats_two_devices_required">Нужно ровно 2 устройства на сервере (сейчас %1$d)</string>
+    <string name="stats_push_peer">Отправить статистику на другое</string>
+    <string name="stats_pushed">Статистика отправлена</string>
+    <string name="stats_push_failed">Не удалось отправить</string>
+    <string name="at_target_local">Локально</string>
+    <string name="at_target_peer">На другое устройство</string>
+    <string name="at_sent_to_peer">Команда отправлена на %1$s</string>
+    <string name="at_peer_unavailable">Нет второго устройства</string>
+    <string name="track_paired_start">Старт трека (оба)</string>
+    <string name="track_paired_started">Синхронный старт запланирован</string>
+    <string name="track_paired_need_two">Нужны 2 устройства online</string>
+</resources>

app/src/main/res/values/themes.xml

@@ -0,0 +1,9 @@
+<resources xmlns:tools="http://schemas.android.com/tools">
+    <!-- Base application theme. -->
+    <style name="Base.Theme.LoraTester" parent="Theme.Material3.DayNight.NoActionBar">
+        <!-- Customize your light theme here. -->
+        <!-- <item name="colorPrimary">@color/my_light_primary</item> -->
+    </style>
+
+    <style name="Theme.LoraTester" parent="Base.Theme.LoraTester" />
+</resources>

app/src/main/res/xml/backup_rules.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+   Sample backup rules file; uncomment and customize as necessary.
+   See https://developer.android.com/guide/topics/data/autobackup
+   for details.
+   Note: This file is ignored for devices older than API 31
+   See https://developer.android.com/about/versions/12/backup-restore
+-->
+<full-backup-content>
+    <!--
+   <include domain="sharedpref" path="."/>
+   <exclude domain="sharedpref" path="device.xml"/>
+-->
+</full-backup-content>

app/src/main/res/xml/data_extraction_rules.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+   Sample data extraction rules file; uncomment and customize as necessary.
+   See https://developer.android.com/about/versions/12/backup-restore#xml-changes
+   for details.
+-->
+<data-extraction-rules>
+    <cloud-backup>
+        <!-- TODO: Use <include> and <exclude> to control what is backed up.
+        <include .../>
+        <exclude .../>
+        -->
+    </cloud-backup>
+    <!--
+    <device-transfer>
+        <include .../>
+        <exclude .../>
+    </device-transfer>
+    -->
+</data-extraction-rules>

app/src/main/res/xml/network_security_config.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<network-security-config>
+    <domain-config cleartextTrafficPermitted="true">
+        <domain includeSubdomains="true">grigowashere.ru</domain>
+        <domain includeSubdomains="false">localhost</domain>
+        <domain includeSubdomains="false">127.0.0.1</domain>
+        <domain includeSubdomains="false">10.0.2.2</domain>
+    </domain-config>
+</network-security-config>

app/src/test/java/com/grigowashere/loratester/AtCommandFormatterTest.java

@@ -0,0 +1,29 @@
+package com.grigowashere.loratester;
+
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+
+import com.grigowashere.loratester.telnet.AtCommandFormatter;
+
+import org.junit.Test;
+
+import java.nio.charset.StandardCharsets;
+
+public class AtCommandFormatterTest {
+
+    @Test
+    public void addsAtPrefix() {
+        assertEquals("AT+H", AtCommandFormatter.normalize("+H"));
+    }
+
+    @Test
+    public void keepsExistingAt() {
+        assertEquals("AT+TX", AtCommandFormatter.normalize("AT+TX"));
+    }
+
+    @Test
+    public void wireEndsWithCrLf() {
+        byte[] wire = AtCommandFormatter.toWireBytes("AT+H");
+        assertEquals("AT+H\r\n", new String(wire, StandardCharsets.UTF_8));
+    }
+}

app/src/test/java/com/grigowashere/loratester/ExampleUnitTest.java

@@ -0,0 +1,17 @@
+package com.grigowashere.loratester;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+public class ExampleUnitTest {
+    @Test
+    public void addition_isCorrect() {
+        assertEquals(4, 2 + 2);
+    }
+}

app/src/test/java/com/grigowashere/loratester/GeoUtilsTest.java

@@ -0,0 +1,21 @@
+package com.grigowashere.loratester;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import com.grigowashere.loratester.location.GeoUtils;
+
+import org.junit.Test;
+
+public class GeoUtilsTest {
+
+    @Test
+    public void rejectsNullIsland() {
+        assertFalse(GeoUtils.isValidCoordinate(0.0, 0.0));
+    }
+
+    @Test
+    public void acceptsRealCoords() {
+        assertTrue(GeoUtils.isValidCoordinate(55.75, 37.62));
+    }
+}

app/src/test/java/com/grigowashere/loratester/LoraFrameExtractTest.java

@@ -0,0 +1,105 @@
+package com.grigowashere.loratester;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
+import com.grigowashere.loratester.telnet.StatsExtractor;
+import com.grigowashere.loratester.telnet.TelnetFrameParser;
+
+import org.junit.Test;
+
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.List;
+
+public class LoraFrameExtractTest {
+
+    private static final String SEND_FRAME = """
+             SEND
+             Frequency:         433000000 Hz
+             Power:             22 dBm
+             Spreading Factor:  12
+             Bandwidth:         125 kHz
+             Packet:            304
+             Payload:           Test TX!
+             TX Speed:          0.60 pkt/s, 155 bit/s
+            """;
+
+    private static final String RECEIVE_FRAME = """
+             RECEIVE
+             Frequency:         433000000 Hz
+             Power:             0 dBm
+             Packet Number:     0
+             Payload:           test
+             RSSI:              -78
+             SNR:               10.5
+             RX Speed:          0.45 pkt/s, 120 bit/s
+             PER:               0.00 %
+            """;
+
+    private static final String FULL_SEND = """
+             SEND
+             Frequency:         433000000 Hz
+             Power:             22 dBm
+             Spreading Factor:  12
+             Bandwidth:         125 kHz
+             Code Rate:         4/5
+             Packet:            304
+             Payload:           Test TX!
+             TX Speed:          0.60 pkt/s, 155 bit/s
+            """;
+
+    @Test
+    public void parsesAllLabeledLinesFromSendScreen() {
+        StatsExtractor extractor = StatsExtractor.withDefaults();
+        StatsExtractor.ExtractedStats stats = extractor.extract(FULL_SEND);
+        assertTrue(stats.metaJson.contains("\"fields\""));
+        assertTrue(stats.metaJson.contains("Frequency"));
+        assertTrue(stats.metaJson.contains("Spreading Factor"));
+        assertTrue(stats.metaJson.contains("Packet"));
+        assertTrue(stats.metaJson.contains("Payload"));
+    }
+
+    @Test
+    public void parsesSendFrameAsTransmitter() {
+        StatsExtractor extractor = StatsExtractor.withDefaults();
+        StatsExtractor.ExtractedStats stats = extractor.extract(FULL_SEND);
+
+        assertEquals("SEND", stats.frameType);
+        assertEquals(StatsExtractor.ROLE_TX, stats.role);
+        assertEquals(22.0, stats.rssi, 0.01);
+        assertNotNull(stats.metaJson);
+        assertTrue(stats.metaJson.contains("\"role\":\"TX\""));
+        assertTrue(stats.metaJson.contains("Test TX!"));
+    }
+
+    @Test
+    public void parsesReceiveFrameAsReceiver() {
+        StatsExtractor extractor = StatsExtractor.withDefaults();
+        StatsExtractor.ExtractedStats stats = extractor.extract(RECEIVE_FRAME);
+
+        assertEquals("RECEIVE", stats.frameType);
+        assertEquals(StatsExtractor.ROLE_RX, stats.role);
+        assertEquals(-78.0, stats.rssi, 0.01);
+        assertEquals(10.5, stats.snrDb, 0.01);
+        assertTrue(stats.metaJson.contains("\"fields\""));
+    }
+
+    @Test
+    public void splitsTwoFramesByReceiveHeaderWithoutEsc() {
+        List<String> frames = new ArrayList<>();
+        TelnetFrameParser parser = new TelnetFrameParser(frames::add);
+        String stream = SEND_FRAME + "\n" + RECEIVE_FRAME;
+        parser.append(stream.getBytes(StandardCharsets.UTF_8));
+        parser.flush();
+        assertTrue(frames.size() >= 1);
+        boolean hasSend = false;
+        boolean hasReceive = false;
+        for (String f : frames) {
+            if (f.contains("SEND")) hasSend = true;
+            if (f.contains("RECEIVE")) hasReceive = true;
+        }
+        assertTrue(hasSend || frames.get(0).contains("SEND"));
+    }
+}

app/src/test/java/com/grigowashere/loratester/TelemetryUploadTest.java

@@ -0,0 +1,84 @@
+package com.grigowashere.loratester;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import com.grigowashere.loratester.api.ServerApi;
+import com.grigowashere.loratester.api.TelemetryPayload;
+import com.grigowashere.loratester.telnet.StatsExtractor;
+import com.grigowashere.loratester.telnet.TelnetFrameParser;
+
+import org.junit.Test;
+
+import java.nio.charset.StandardCharsets;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicReference;
+
+import okhttp3.mockwebserver.MockResponse;
+import okhttp3.mockwebserver.MockWebServer;
+import okhttp3.mockwebserver.RecordedRequest;
+
+public class TelemetryUploadTest {
+
+    @Test
+    public void frameTriggersTelemetryPost() throws Exception {
+        try (MockWebServer server = new MockWebServer()) {
+            server.enqueue(new MockResponse().setBody("{\"ok\":true}"));
+            server.start();
+
+            String baseUrl = server.url("/").toString();
+            if (baseUrl.endsWith("/")) {
+                baseUrl = baseUrl.substring(0, baseUrl.length() - 1);
+            }
+
+            ServerApi api = new ServerApi(baseUrl);
+            StatsExtractor extractor = StatsExtractor.withDefaults();
+            AtomicReference<String> postedMeta = new AtomicReference<>();
+            CountDownLatch latch = new CountDownLatch(1);
+
+            TelnetFrameParser parser = new TelnetFrameParser(frame -> {
+                StatsExtractor.ExtractedStats stats = extractor.extract(frame);
+                TelemetryPayload payload = new TelemetryPayload(
+                        "test-device",
+                        55.75,
+                        37.62,
+                        stats.rssi,
+                        stats.rangeM,
+                        null,
+                        stats.metaJson,
+                        stats.role,
+                        System.currentTimeMillis() / 1000.0
+                );
+                try {
+                    api.postTelemetry(payload);
+                    postedMeta.set(stats.metaJson);
+                    latch.countDown();
+                } catch (Exception e) {
+                    throw new RuntimeException(e);
+                }
+            });
+
+            String chunk = """
+                    SEND
+                    Power:             22 dBm
+                    RSSI:              -72
+                    range:             1200
+                    \u001b[2J""";
+            parser.append(chunk.getBytes(StandardCharsets.UTF_8));
+
+            assertTrue(latch.await(5, TimeUnit.SECONDS));
+
+            RecordedRequest req = server.takeRequest(5, TimeUnit.SECONDS);
+            assertEquals("POST", req.getMethod());
+            assertEquals("android", req.getHeader(ServerApi.HEADER_LORA_CLIENT));
+            assertTrue(req.getPath().contains("/api/telemetry"));
+            String body = req.getBody().readUtf8();
+            assertTrue(body.contains("test-device"));
+            assertTrue(body.contains("\"meta\""));
+            assertTrue(body.contains("\"fields\""));
+            assertTrue(postedMeta.get().contains("SEND"));
+            assertTrue(postedMeta.get().contains("TX"));
+        }
+    }
+}

app/src/test/java/com/grigowashere/loratester/TelnetClientSendTest.java

@@ -0,0 +1,76 @@
+package com.grigowashere.loratester;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import com.grigowashere.loratester.telnet.TelnetClient;
+
+import org.junit.Test;
+
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.ServerSocket;
+import java.net.Socket;
+import java.nio.charset.StandardCharsets;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicReference;
+
+public class TelnetClientSendTest {
+
+    @Test
+    public void sendAtCommandWritesCrLfLine() throws Exception {
+        AtomicReference<String> received = new AtomicReference<>();
+        CountDownLatch connectedLatch = new CountDownLatch(1);
+
+        try (ServerSocket serverSocket = new ServerSocket(0)) {
+            int port = serverSocket.getLocalPort();
+            Thread acceptThread = new Thread(() -> {
+                try (Socket client = serverSocket.accept()) {
+                    connectedLatch.countDown();
+                    InputStream in = client.getInputStream();
+                    OutputStream out = client.getOutputStream();
+                    byte[] buf = new byte[256];
+                    int n = in.read(buf);
+                    if (n > 0) {
+                        received.set(new String(buf, 0, n, StandardCharsets.UTF_8));
+                    }
+                    out.write("OK\r\n".getBytes(StandardCharsets.UTF_8));
+                    out.flush();
+                    Thread.sleep(300);
+                } catch (Exception ignored) {
+                }
+            });
+            acceptThread.start();
+
+            TelnetClient telnet = new TelnetClient("127.0.0.1", port, new TelnetClient.Listener() {
+                @Override
+                public void onConnected() {
+                }
+
+                @Override
+                public void onDisconnected() {
+                }
+
+                @Override
+                public void onBytes(byte[] data, int length) {
+                }
+
+                @Override
+                public void onError(String message) {
+                }
+            });
+            telnet.start();
+            assertTrue(connectedLatch.await(5, TimeUnit.SECONDS));
+            Thread.sleep(300);
+
+            TelnetClient.SendResult result = telnet.sendAtCommand("AT+H");
+            assertEquals(TelnetClient.SendResult.SENT, result);
+            Thread.sleep(400);
+
+            telnet.stop();
+            acceptThread.join(2000);
+            assertEquals("AT+H\r\n", received.get());
+        }
+    }
+}

app/src/test/java/com/grigowashere/loratester/TelnetFrameParserTest.java

@@ -0,0 +1,66 @@
+package com.grigowashere.loratester;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import com.grigowashere.loratester.telnet.TelnetFrameParser;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.List;
+
+public class TelnetFrameParserTest {
+
+    private final List<String> frames = new ArrayList<>();
+    private TelnetFrameParser parser;
+
+    @Before
+    public void setUp() {
+        frames.clear();
+        parser = new TelnetFrameParser(frames::add);
+    }
+
+    @Test
+    public void splitsOnAnsiClear() {
+        byte[] data = "frame1\u001b[2Jframe2".getBytes(StandardCharsets.UTF_8);
+        parser.append(data);
+        assertEquals(1, frames.size());
+        assertEquals("frame1", frames.get(0));
+        parser.flush();
+        assertEquals(2, frames.size());
+        assertEquals("frame2", frames.get(1));
+    }
+
+    @Test
+    public void splitsOnFormFeed() {
+        byte[] data = "alpha\u000cbeta".getBytes(StandardCharsets.UTF_8);
+        parser.append(data);
+        parser.flush();
+        assertEquals(2, frames.size());
+        assertEquals("alpha", frames.get(0));
+        assertEquals("beta", frames.get(1));
+    }
+
+    @Test
+    public void twoFramesInOneChunk() {
+        byte[] data = "A\u001b[2JB\u001b[2JC".getBytes(StandardCharsets.UTF_8);
+        parser.append(data);
+        parser.flush();
+        assertEquals(3, frames.size());
+        assertEquals("A", frames.get(0));
+        assertEquals("B", frames.get(1));
+        assertEquals("C", frames.get(2));
+    }
+
+    @Test
+    public void flushEmitsTrailingBuffer() {
+        parser.append("tail only".getBytes(StandardCharsets.UTF_8));
+        assertEquals(0, frames.size());
+        parser.flush();
+        assertEquals(1, frames.size());
+        assertTrue(frames.get(0).contains("tail"));
+    }
+}

build.gradle.kts

@@ -0,0 +1,4 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+plugins {
+    alias(libs.plugins.android.application) apply false
+}

gradle.properties

@@ -0,0 +1,21 @@
+# Project-wide Gradle settings.
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. For more details, visit
+# https://developer.android.com/r/tools/gradle-multi-project-decoupled-projects
+# org.gradle.parallel=true
+# AndroidX package structure to make it clearer which packages are bundled with the
+# Android operating system, and which are packaged with your app's APK
+# https://developer.android.com/topic/libraries/support-library/androidx-rn
+android.useAndroidX=true
+# Enables namespacing of each library's R class so that its R class includes only the
+# resources declared in the library itself and none from the library's dependencies,
+# thereby reducing the size of the R class for that library
+android.nonTransitiveRClass=true

gradle/libs.versions.toml

@@ -0,0 +1,42 @@
+[versions]
+agp = "8.9.0"
+junit = "4.13.2"
+junitVersion = "1.3.0"
+espressoCore = "3.7.0"
+appcompat = "1.7.1"
+material = "1.13.0"
+activity = "1.9.3"
+constraintlayout = "2.2.1"
+okhttp = "4.12.0"
+gson = "2.11.0"
+playServicesLocation = "21.3.0"
+mapsforge = "0.21.0"
+viewpager2 = "1.1.0"
+fragment = "1.8.5"
+recyclerview = "1.3.2"
+mockwebserver = "4.12.0"
+
+[libraries]
+junit = { group = "junit", name = "junit", version.ref = "junit" }
+ext-junit = { group = "androidx.test.ext", name = "junit", version.ref = "junitVersion" }
+espresso-core = { group = "androidx.test.espresso", name = "espresso-core", version.ref = "espressoCore" }
+appcompat = { group = "androidx.appcompat", name = "appcompat", version.ref = "appcompat" }
+material = { group = "com.google.android.material", name = "material", version.ref = "material" }
+activity = { group = "androidx.activity", name = "activity", version.ref = "activity" }
+constraintlayout = { group = "androidx.constraintlayout", name = "constraintlayout", version.ref = "constraintlayout" }
+okhttp = { group = "com.squareup.okhttp3", name = "okhttp", version.ref = "okhttp" }
+gson = { group = "com.google.code.gson", name = "gson", version.ref = "gson" }
+play-services-location = { group = "com.google.android.gms", name = "play-services-location", version.ref = "playServicesLocation" }
+mapsforge-core = { group = "org.mapsforge", name = "mapsforge-core", version.ref = "mapsforge" }
+mapsforge-map = { group = "org.mapsforge", name = "mapsforge-map", version.ref = "mapsforge" }
+mapsforge-map-android = { group = "org.mapsforge", name = "mapsforge-map-android", version.ref = "mapsforge" }
+mapsforge-map-reader = { group = "org.mapsforge", name = "mapsforge-map-reader", version.ref = "mapsforge" }
+mapsforge-themes = { group = "org.mapsforge", name = "mapsforge-themes", version.ref = "mapsforge" }
+viewpager2 = { group = "androidx.viewpager2", name = "viewpager2", version.ref = "viewpager2" }
+fragment = { group = "androidx.fragment", name = "fragment", version.ref = "fragment" }
+recyclerview = { group = "androidx.recyclerview", name = "recyclerview", version.ref = "recyclerview" }
+mockwebserver = { group = "com.squareup.okhttp3", name = "mockwebserver", version.ref = "mockwebserver" }
+
+[plugins]
+android-application = { id = "com.android.application", version.ref = "agp" }
+

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+#Thu Jun 04 08:48:49 MSK 2026
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.11.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,185 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"