offline track

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

@@ -67,6 +67,15 @@ public class CommandPoller {
                 }
             }
 
+            @Override
+            public void onSyncComplete(long trackId, int pointCount) {
+                if (pendingAckSessionId > 0 && trackId > 0) {
+                    long sid = pendingAckSessionId;
+                    pendingAckSessionId = -1;
+                    executor.execute(() -> ackSession(sid, trackId));
+                }
+            }
+
             @Override
             public void onError(String message) {
                 Log.w(TAG, "track: " + message);

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

@@ -31,6 +31,7 @@ public class LoraApp extends Application {
         ServerApi serverApi = new ServerApi(settingsRepository.getServerUrl());
         String deviceId = settingsRepository.getOrCreateDeviceId();
         trackRecorder = new TrackRecorder(
+                this,
                 serverApi,
                 telemetryUploader,
                 deviceId,
@@ -103,6 +104,7 @@ public class LoraApp extends Application {
         }
         ServerApi serverApi = new ServerApi(settingsRepository.getServerUrl());
         trackRecorder = new TrackRecorder(
+                this,
                 serverApi,
                 telemetryUploader,
                 settingsRepository.getOrCreateDeviceId(),

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

@@ -114,6 +114,28 @@ public class ServerApi {
         postJson("/api/tracks/" + trackId + "/finish", new HashMap<>(), true);
     }
 
+    public long syncTrack(
+            String deviceId,
+            Long trackId,
+            double startedAt,
+            List<Map<String, Object>> points,
+            boolean finish
+    ) throws IOException {
+        Map<String, Object> body = new HashMap<>();
+        body.put("device_id", deviceId);
+        if (trackId != null && trackId > 0) {
+            body.put("track_id", trackId);
+        }
+        if (startedAt > 0) {
+            body.put("started_at", startedAt);
+        }
+        body.put("points", points != null ? points : List.of());
+        body.put("finish", finish);
+        Map<String, Object> resp = postJsonMap("/api/tracks/sync", body, true);
+        Number id = (Number) resp.get("track_id");
+        return id != null ? id.longValue() : (trackId != null ? trackId : -1);
+    }
+
     public List<TrackInfo> listTracks(String deviceId) throws IOException {
         return getJsonList("/api/tracks?device_id=" + deviceId + "&limit=50", TRACK_LIST);
     }

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

@@ -32,10 +32,10 @@ public class LocationTracker {
             return;
         }
         LocationRequest request = new LocationRequest.Builder(
-                Priority.PRIORITY_HIGH_ACCURACY, 10_000L
+                Priority.PRIORITY_HIGH_ACCURACY, 1_000L
         )
-                .setMinUpdateIntervalMillis(5_000L)
+                .setMinUpdateIntervalMillis(1_000L)
-                .setMaxUpdateDelayMillis(15_000L)
+                .setMaxUpdateDelayMillis(2_000L)
                 .setWaitForAccurateLocation(false)
                 .build();
 

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

@@ -0,0 +1,161 @@
+package com.grigowashere.loratester.track;
+
+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.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/** Persists pending track points and recording state across network outages / app restarts. */
+public class TrackPointQueue {
+
+    private static final String TAG = "TrackPointQueue";
+    private static final String FILE_NAME = "track_pending_points.json";
+    private static final Gson GSON = new Gson();
+    private static final Type SNAPSHOT_TYPE = new TypeToken<Snapshot>() {}.getType();
+
+    private final File queueFile;
+
+    public TrackPointQueue(Context context) {
+        queueFile = new File(context.getFilesDir(), FILE_NAME);
+    }
+
+    public static final class Snapshot {
+        public long trackId = -1;
+        public boolean recording;
+        /** Stopped locally; waiting for upload + finish. */
+        public boolean pendingSync;
+        public int totalPoints;
+        public double startedAt;
+        public String deviceId;
+        public List<PendingPoint> pending = new ArrayList<>();
+    }
+
+    public static final class PendingPoint {
+        public double ts;
+        public double lat;
+        public double lon;
+        public Double altitude_gps;
+        public Double rssi;
+        public String role;
+        public String meta;
+
+        static PendingPoint fromMap(Map<String, Object> point) {
+            PendingPoint p = new PendingPoint();
+            p.ts = toDouble(point.get("ts"));
+            p.lat = toDouble(point.get("lat"));
+            p.lon = toDouble(point.get("lon"));
+            Object alt = point.get("altitude_gps");
+            if (alt instanceof Number) {
+                p.altitude_gps = ((Number) alt).doubleValue();
+            }
+            Object rssi = point.get("rssi");
+            if (rssi instanceof Number) {
+                p.rssi = ((Number) rssi).doubleValue();
+            }
+            Object role = point.get("role");
+            if (role != null) {
+                p.role = String.valueOf(role);
+            }
+            Object meta = point.get("meta");
+            if (meta != null) {
+                p.meta = String.valueOf(meta);
+            }
+            return p;
+        }
+
+        Map<String, Object> toMap() {
+            Map<String, Object> point = new HashMap<>();
+            point.put("ts", ts);
+            point.put("lat", lat);
+            point.put("lon", lon);
+            if (altitude_gps != null) {
+                point.put("altitude_gps", altitude_gps);
+            }
+            if (rssi != null) {
+                point.put("rssi", rssi);
+            }
+            if (role != null) {
+                point.put("role", role);
+            }
+            if (meta != null) {
+                point.put("meta", meta);
+            }
+            return point;
+        }
+
+        private static double toDouble(Object value) {
+            if (value instanceof Number) {
+                return ((Number) value).doubleValue();
+            }
+            return 0.0;
+        }
+    }
+
+    public synchronized Snapshot load() {
+        if (!queueFile.exists()) {
+            return null;
+        }
+        try (FileReader reader = new FileReader(queueFile)) {
+            Snapshot snap = GSON.fromJson(reader, SNAPSHOT_TYPE);
+            if (snap == null) {
+                return null;
+            }
+            if (snap.pending == null) {
+                snap.pending = new ArrayList<>();
+            }
+            return snap;
+        } catch (Exception e) {
+            Log.w(TAG, "load failed", e);
+            return null;
+        }
+    }
+
+    public synchronized void save(
+            String deviceId,
+            long trackId,
+            boolean recording,
+            boolean pendingSync,
+            int totalPoints,
+            double startedAt,
+            List<Map<String, Object>> pending
+    ) {
+        Snapshot snap = new Snapshot();
+        snap.deviceId = deviceId;
+        snap.trackId = trackId;
+        snap.recording = recording;
+        snap.pendingSync = pendingSync;
+        snap.totalPoints = totalPoints;
+        snap.startedAt = startedAt;
+        snap.pending = new ArrayList<>();
+        if (pending != null) {
+            for (Map<String, Object> point : pending) {
+                snap.pending.add(PendingPoint.fromMap(point));
+            }
+        }
+        persist(snap);
+    }
+
+    public synchronized void clear() {
+        if (queueFile.exists() && !queueFile.delete()) {
+            Log.w(TAG, "clear failed");
+        }
+    }
+
+    private void persist(Snapshot snap) {
+        try (FileWriter writer = new FileWriter(queueFile)) {
+            GSON.toJson(snap, writer);
+        } catch (Exception e) {
+            Log.w(TAG, "persist failed", e);
+        }
+    }
+}

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

@@ -1,9 +1,11 @@
 package com.grigowashere.loratester.track;
 
+import android.content.Context;
 import android.os.Handler;
 import android.os.Looper;
 import android.util.Log;
 
+import com.grigowashere.loratester.R;
 import com.grigowashere.loratester.TelemetryUploader;
 import com.grigowashere.loratester.api.ServerApi;
 import com.grigowashere.loratester.location.GeoUtils;
@@ -19,19 +21,26 @@ 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;
+    private static final long FLUSH_MS = 10_000;
+    /** Local-only track before first server sync (offline start). */
+    private static final long LOCAL_TRACK_ID = 0;
+
+    /** No time limit — pending points stay on disk until track stop or successful upload. */
+    public static final int MAX_OFFLINE_BUFFER_POINTS = 500_000;
 
     public interface Listener {
         void onStateChanged(boolean recording, int pointCount, long trackId);
 
         void onError(String message);
 
+        default void onSyncComplete(long trackId, int pointCount) {
+        }
+
         default void onPointRecorded(double lat, double lon) {
         }
     }
@@ -39,6 +48,8 @@ public class TrackRecorder {
     private final ServerApi serverApi;
     private final TelemetryUploader uploader;
     private final NetworkMonitor networkMonitor;
+    private final TrackPointQueue pendingQueue;
+    private final Context appContext;
     private final String deviceId;
     private final ExecutorService executor = Executors.newSingleThreadExecutor();
     private final Handler mainHandler = new Handler(Looper.getMainLooper());
@@ -53,7 +64,9 @@ public class TrackRecorder {
     private volatile double lon = Double.NaN;
     private volatile double altitude = Double.NaN;
     private volatile long trackId = -1;
+    private volatile double localStartedAt;
     private volatile boolean recording;
+    private volatile boolean pendingSync;
     private final List<Map<String, Object>> buffer = new ArrayList<>();
     private int totalPoints;
     private ScheduledFuture<?> sampleTask;
@@ -62,6 +75,7 @@ public class TrackRecorder {
     private Listener pairedListener;
 
     public TrackRecorder(
+            Context context,
             ServerApi serverApi,
             TelemetryUploader uploader,
             String deviceId,
@@ -71,11 +85,14 @@ public class TrackRecorder {
         this.uploader = uploader;
         this.deviceId = deviceId;
         this.networkMonitor = networkMonitor;
+        this.appContext = context.getApplicationContext();
+        this.pendingQueue = new TrackPointQueue(this.appContext);
         networkMonitor.addListener(online -> {
-            if (online && recording) {
+            if (online) {
-                executor.execute(this::flushBuffer);
+                executor.execute(this::syncWhenOnline);
             }
         });
+        restoreIfNeeded();
     }
 
     public void setListener(Listener listener) {
@@ -100,6 +117,10 @@ public class TrackRecorder {
         return recording;
     }
 
+    public boolean hasPendingSync() {
+        return pendingSync;
+    }
+
     public int getPointCount() {
         return totalPoints;
     }
@@ -108,30 +129,97 @@ public class TrackRecorder {
         return trackId;
     }
 
+    public int getPendingFlushCount() {
+        synchronized (buffer) {
+            return buffer.size();
+        }
+    }
+
     public void start() {
         if (recording) {
             return;
         }
-        if (!networkMonitor.isOnline()) {
+        executor.execute(() -> {
-            notifyError("Нужна сеть для начала трека");
+            if (pendingSync) {
+                syncWhenOnline();
+                if (pendingSync) {
+                    notifyError(appContext.getString(R.string.track_sync_pending));
+                    return;
+                }
+            }
+            if (!networkMonitor.isOnline()) {
+                startLocalRecording();
                 return;
             }
-        executor.execute(() -> {
             try {
+                startOnlineRecording();
+            } catch (Exception e) {
+                Log.w(TAG, "start track on server failed", e);
+                if (isReachabilityError(e)) {
+                    startLocalRecording();
+                } else {
+                    notifyError(e.getMessage() != null ? e.getMessage() : "start failed");
+                }
+            }
+        });
+    }
+
+    /** Retry upload of a track stopped offline. */
+    public void retryPendingSync() {
+        executor.execute(this::syncWhenOnline);
+    }
+
+    private void startOnlineRecording() throws Exception {
         long id = serverApi.startTrack(deviceId);
         synchronized (buffer) {
             buffer.clear();
         }
         totalPoints = 0;
         trackId = id;
+        localStartedAt = System.currentTimeMillis() / 1000.0;
         recording = true;
+        pendingSync = false;
+        persistState(false);
         startTimers();
         notifyState();
-            } catch (Exception e) {
-                Log.e(TAG, "start track failed", e);
-                notifyError(e.getMessage());
     }
-        });
+
+    private static boolean isReachabilityError(Throwable e) {
+        while (e != null) {
+            if (e instanceof java.net.UnknownHostException
+                    || e instanceof java.net.ConnectException
+                    || e instanceof java.net.SocketTimeoutException) {
+                return true;
+            }
+            String msg = e.getMessage();
+            if (msg != null) {
+                String lower = msg.toLowerCase();
+                if (lower.contains("unable to resolve host")
+                        || lower.contains("failed to connect")
+                        || lower.contains("timeout")
+                        || lower.contains("econnrefused")
+                        || lower.contains("network is unreachable")) {
+                    return true;
+                }
+            }
+            e = e.getCause();
+        }
+        return false;
+    }
+
+    private void startLocalRecording() {
+        synchronized (buffer) {
+            buffer.clear();
+        }
+        totalPoints = 0;
+        trackId = LOCAL_TRACK_ID;
+        localStartedAt = System.currentTimeMillis() / 1000.0;
+        recording = true;
+        pendingSync = false;
+        persistState(false);
+        startTimers();
+        notifyState();
+        notifyError(appContext.getString(R.string.track_offline_started));
     }
 
     public void stop() {
@@ -141,22 +229,146 @@ public class TrackRecorder {
         recording = false;
         stopTimers();
         executor.execute(() -> {
-            try {
+            boolean synced = completeTrackUpload(true);
-                flushBuffer();
+            if (!synced) {
-                if (trackId > 0) {
+                pendingSync = true;
-                    serverApi.finishTrack(trackId);
+                persistState(true);
+                notifyError(appContext.getString(R.string.track_sync_pending));
+            } else {
+                resetAfterSuccessfulSync(-1);
             }
-            } catch (Exception e) {
-                Log.e(TAG, "stop track failed", e);
-                notifyError(e.getMessage());
-            } finally {
-                trackId = -1;
             notifyState();
-            }
         });
     }
 
+    private void restoreIfNeeded() {
+        TrackPointQueue.Snapshot snap = pendingQueue.load();
+        if (snap == null) {
+            return;
+        }
+        if (snap.deviceId != null && !snap.deviceId.equals(deviceId)) {
+            return;
+        }
+        trackId = snap.trackId;
+        totalPoints = snap.totalPoints;
+        localStartedAt = snap.startedAt > 0 ? snap.startedAt : System.currentTimeMillis() / 1000.0;
+        pendingSync = snap.pendingSync;
+        synchronized (buffer) {
+            buffer.clear();
+            if (snap.pending != null) {
+                for (TrackPointQueue.PendingPoint point : snap.pending) {
+                    buffer.add(point.toMap());
+                }
+            }
+        }
+        if (snap.recording) {
+            recording = true;
+            Log.i(TAG, "restored active track " + trackId + ", pending=" + buffer.size());
+            startTimers();
+            executor.execute(this::syncWhenOnline);
+            notifyState();
+            return;
+        }
+        if (snap.pendingSync) {
+            Log.i(TAG, "restored pending sync track " + trackId + ", points=" + buffer.size());
+            executor.execute(this::syncWhenOnline);
+            notifyState();
+        }
+    }
+
+    private void syncWhenOnline() {
+        if (!networkMonitor.isOnline()) {
+            return;
+        }
+        if (recording) {
+            if (trackId == LOCAL_TRACK_ID) {
+                promoteLocalTrackToServer();
+            } else if (trackId > 0) {
+                flushBuffer();
+            }
+            return;
+        }
+        if (pendingSync) {
+            if (completeTrackUpload(true)) {
+                long finishedId = trackId > 0 ? trackId : -1;
+                int count = totalPoints;
+                resetAfterSuccessfulSync(-1);
+                notifySyncComplete(finishedId, count);
+                notifyState();
+            }
+        }
+    }
+
+    private void promoteLocalTrackToServer() {
+        if (trackId != LOCAL_TRACK_ID || !recording) {
+            return;
+        }
+        try {
+            long id = serverApi.startTrack(deviceId);
+            trackId = id;
+            flushBuffer();
+            persistState(false);
+            notifyState();
+            Log.i(TAG, "promoted local track to server id " + id);
+        } catch (Exception e) {
+            Log.w(TAG, "promote local track failed", e);
+        }
+    }
+
+    private boolean completeTrackUpload(boolean finish) {
+        if (!networkMonitor.isOnline()) {
+            return false;
+        }
+        List<Map<String, Object>> batch;
+        synchronized (buffer) {
+            if (buffer.isEmpty() && !finish) {
+                return true;
+            }
+            batch = new ArrayList<>(buffer);
+            buffer.clear();
+        }
+        try {
+            Long serverTrackId = trackId > 0 ? trackId : null;
+            long resultId = serverApi.syncTrack(
+                    deviceId,
+                    serverTrackId,
+                    localStartedAt,
+                    batch,
+                    finish
+            );
+            if (trackId <= 0) {
+                trackId = resultId;
+            }
+            persistState(false);
+            if (finish && batch.isEmpty()) {
+                return true;
+            }
+            return true;
+        } catch (Exception e) {
+            Log.e(TAG, "track sync failed", e);
+            synchronized (buffer) {
+                buffer.addAll(0, batch);
+            }
+            persistState(finish);
+            notifyError(e.getMessage());
+            return false;
+        }
+    }
+
+    private void resetAfterSuccessfulSync(long finishedTrackId) {
+        trackId = -1;
+        pendingSync = false;
+        recording = false;
+        synchronized (buffer) {
+            buffer.clear();
+        }
+        pendingQueue.clear();
+    }
+
     private void startTimers() {
+        if (sampleTask != null || flushTask != null) {
+            return;
+        }
         sampleTask = scheduler.scheduleAtFixedRate(
                 () -> executor.execute(this::samplePoint),
                 SAMPLE_MS,
@@ -210,12 +422,58 @@ public class TrackRecorder {
         }
         synchronized (buffer) {
             buffer.add(point);
+            if (buffer.size() > MAX_OFFLINE_BUFFER_POINTS) {
+                buffer.remove(0);
+                Log.w(TAG, "offline buffer trimmed at " + MAX_OFFLINE_BUFFER_POINTS);
+            }
         }
         totalPoints++;
+        persistState(false);
         notifyState();
         notifyPoint(lat, lon);
     }
 
+    private void persistState(boolean markPendingSync) {
+        List<Map<String, Object>> copy;
+        synchronized (buffer) {
+            copy = new ArrayList<>(buffer);
+        }
+        pendingQueue.save(
+                deviceId,
+                trackId,
+                recording,
+                markPendingSync || pendingSync,
+                totalPoints,
+                localStartedAt,
+                copy
+        );
+    }
+
+    private void flushBuffer() {
+        if (!recording || trackId <= 0 || !networkMonitor.isOnline()) {
+            return;
+        }
+        List<Map<String, Object>> batch;
+        synchronized (buffer) {
+            if (buffer.isEmpty()) {
+                return;
+            }
+            batch = new ArrayList<>(buffer);
+            buffer.clear();
+        }
+        try {
+            serverApi.addTrackPoints(trackId, batch);
+            persistState(false);
+        } catch (Exception e) {
+            Log.e(TAG, "flush points failed", e);
+            synchronized (buffer) {
+                buffer.addAll(0, batch);
+            }
+            persistState(false);
+            notifyError(e.getMessage());
+        }
+    }
+
     private void notifyPoint(double lat, double lon) {
         mainHandler.post(() -> {
             if (listener != null) {
@@ -227,27 +485,15 @@ public class TrackRecorder {
         });
     }
 
-    private void flushBuffer() {
+    private void notifySyncComplete(long trackId, int pointCount) {
-        if (trackId < 0) {
+        mainHandler.post(() -> {
-            return;
+            if (listener != null) {
+                listener.onSyncComplete(trackId, pointCount);
             }
-        List<Map<String, Object>> batch;
+            if (pairedListener != null) {
-        synchronized (buffer) {
+                pairedListener.onSyncComplete(trackId, pointCount);
-            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() {

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

@@ -0,0 +1,25 @@
+package com.grigowashere.loratester.ui;
+
+import com.grigowashere.loratester.api.DeviceInfo;
+
+/** Human-readable device labels (matches web deviceDisplayName). */
+public final class DeviceNames {
+
+    private DeviceNames() {
+    }
+
+    public static String displayName(DeviceInfo device, String fallbackId) {
+        if (device != null && device.label != null) {
+            String label = device.label.trim();
+            if (!label.isEmpty()
+                    && device.device_id != null
+                    && !label.equals(device.device_id)) {
+                return label;
+            }
+        }
+        if (fallbackId != null && !fallbackId.isEmpty()) {
+            return fallbackId;
+        }
+        return "—";
+    }
+}

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

@@ -111,6 +111,8 @@ public class MapFragment extends Fragment {
     private TileCache tileCache;
     private TextView mapStatus;
     private TextView mapDistance;
+    private TextView mapRxQuality;
+    private TextView mapTrackStatus;
     private TextView mapHillStatus;
     private TextView trackStatus;
     private ImageView iconServer;
@@ -189,6 +191,8 @@ public class MapFragment extends Fragment {
         mapView = view.findViewById(R.id.mapView);
         mapStatus = view.findViewById(R.id.mapStatus);
         mapDistance = view.findViewById(R.id.mapDistance);
+        mapRxQuality = view.findViewById(R.id.mapRxQuality);
+        mapTrackStatus = view.findViewById(R.id.mapTrackStatus);
         mapHillStatus = view.findViewById(R.id.mapHillStatus);
         iconServer = view.findViewById(R.id.iconServer);
         iconLora = view.findViewById(R.id.iconLora);
@@ -221,9 +225,29 @@ public class MapFragment extends Fragment {
 
         networkOnline = networkMonitor != null && networkMonitor.isOnline();
         networkListener = online -> {
+            boolean wasOnline = networkOnline;
             networkOnline = online;
             if (isAdded() && mapStatus != null) {
-                requireActivity().runOnUiThread(this::updateNetworkStatusLine);
+                requireActivity().runOnUiThread(() -> {
+                    updateNetworkStatusLine();
+                    updateTrackStatusUi();
+                });
+            }
+            if (isAdded() && trackRecorder != null && trackRecorder.isRecording()) {
+                int pending = trackRecorder.getPendingFlushCount();
+                if (!online && wasOnline) {
+                    requireActivity().runOnUiThread(() -> Toast.makeText(
+                            requireContext(),
+                            getString(R.string.track_offline_toast, pending),
+                            Toast.LENGTH_LONG
+                    ).show());
+                } else if (online && !wasOnline && pending > 0) {
+                    requireActivity().runOnUiThread(() -> Toast.makeText(
+                            requireContext(),
+                            getString(R.string.track_online_toast, pending),
+                            Toast.LENGTH_SHORT
+                    ).show());
+                }
             }
         };
         if (networkMonitor != null) {
@@ -465,6 +489,8 @@ public class MapFragment extends Fragment {
         heatmapActive = false;
         mapStatus = null;
         mapDistance = null;
+        mapRxQuality = null;
+        mapTrackStatus = null;
         trackStatus = null;
         btnTrack = null;
         btnPairedTrack = null;
@@ -507,9 +533,7 @@ public class MapFragment extends Fragment {
                 btnTrack.setActivated(recording);
                 btnTrack.setContentDescription(getString(
                         recording ? R.string.track_stop : R.string.track_start));
-                if (trackStatus != null) {
+                updateTrackStatusUi();
-                    trackStatus.setText(getString(R.string.track_status, pointCount));
-                }
                 if (recording && pointCount <= 1) {
                     clearLiveTrackLayers();
                 }
@@ -523,9 +547,26 @@ public class MapFragment extends Fragment {
 
             @Override
             public void onError(String message) {
-                if (isAdded() && trackStatus != null) {
+                if (!isAdded()) {
+                    return;
+                }
+                if (trackStatus != null) {
                     trackStatus.setText(getString(R.string.track_error, message));
                 }
+                Toast.makeText(requireContext(), message, Toast.LENGTH_LONG).show();
+            }
+
+            @Override
+            public void onSyncComplete(long trackId, int pointCount) {
+                if (!isAdded()) {
+                    return;
+                }
+                Toast.makeText(
+                        requireContext(),
+                        getString(R.string.track_sync_done, trackId, pointCount),
+                        Toast.LENGTH_LONG
+                ).show();
+                loadTrackList();
             }
 
             @Override
@@ -601,10 +642,49 @@ public class MapFragment extends Fragment {
         liveTrackMarker = null;
     }
 
+    private void updateTrackStatusUi() {
+        if (trackRecorder == null) {
+            return;
+        }
+        if (!trackRecorder.isRecording()) {
+            if (trackStatus != null) {
+                trackStatus.setText("");
+            }
+            if (mapTrackStatus != null) {
+                mapTrackStatus.setVisibility(View.GONE);
+            }
+            return;
+        }
+        int total = trackRecorder.getPointCount();
+        int pending = trackRecorder.getPendingFlushCount();
+        CharSequence line;
+        if (!networkOnline && pending > 0) {
+            line = getString(R.string.track_status_offline, total, pending);
+        } else {
+            line = getString(R.string.track_status_online, total);
+        }
+        if (trackStatus != null) {
+            trackStatus.setText(line);
+        }
+        if (mapTrackStatus != null) {
+            mapTrackStatus.setVisibility(View.VISIBLE);
+            if (!networkOnline && pending > 0) {
+                mapTrackStatus.setText(getString(R.string.map_track_status_offline, total, pending));
+            } else {
+                mapTrackStatus.setText(getString(R.string.map_track_status_online, total));
+            }
+        }
+    }
+
     private void toggleTracking() {
         if (trackRecorder.isRecording()) {
             trackRecorder.stop();
         } else {
+            if (trackRecorder.hasPendingSync()) {
+                trackRecorder.retryPendingSync();
+                Toast.makeText(requireContext(), R.string.track_sync_pending, Toast.LENGTH_SHORT).show();
+                return;
+            }
             trackRecorder.start();
         }
     }
@@ -1414,6 +1494,7 @@ public class MapFragment extends Fragment {
             ));
         }
         updateGpsDistance();
+        updateRxQuality();
         updateConnectionIcons(lastDevices, serverConnected);
         checkHeatmapGpsFollow();
 
@@ -1423,6 +1504,53 @@ public class MapFragment extends Fragment {
         }
     }
 
+    private void updateRxQuality() {
+        if (mapRxQuality == null) {
+            return;
+        }
+        Double quality = resolveRxQualityPercent();
+        if (quality != null) {
+            mapRxQuality.setVisibility(View.VISIBLE);
+            mapRxQuality.setText(getString(
+                    R.string.map_rx_quality,
+                    String.format(Locale.US, "%.0f", quality)));
+        } else {
+            mapRxQuality.setVisibility(View.VISIBLE);
+            mapRxQuality.setText(R.string.map_rx_quality_unknown);
+        }
+    }
+
+    private Double resolveRxQualityPercent() {
+        StatsExtractor.ExtractedStats localStats =
+                uploader != null ? uploader.getLastStats() : null;
+        if (localStats != null) {
+            RadioSnapshot localSnap = RadioSnapshot.fromExtracted(localStats);
+            if (StatsExtractor.ROLE_RX.equals(localSnap.role)
+                    && localSnap.rxQualityPercent != null) {
+                return localSnap.rxQualityPercent;
+            }
+        }
+        for (DeviceInfo d : lastDevices) {
+            if (!StatsExtractor.ROLE_RX.equals(d.role)) {
+                continue;
+            }
+            RadioSnapshot snap = RadioSnapshot.fromMeta(d.meta, d.role, d.rssi);
+            if (snap.rxQualityPercent != null) {
+                return snap.rxQualityPercent;
+            }
+        }
+        if (peerStatsCache != null) {
+            PeerStatsCache.Snapshot push = peerStatsCache.get();
+            if (push != null && StatsExtractor.ROLE_RX.equals(push.role) && push.meta != null) {
+                RadioSnapshot snap = RadioSnapshot.fromMeta(push.meta, push.role, push.rssi);
+                if (snap.rxQualityPercent != null) {
+                    return snap.rxQualityPercent;
+                }
+            }
+        }
+        return null;
+    }
+
     private void updateGpsDistance() {
         if (mapDistance == null) {
             return;

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

@@ -159,24 +159,48 @@ public class RadioComparePanel extends LinearLayout {
             String peerId,
             Set<String> changedLocal,
             Set<String> changedPeer
+    ) {
+        bindByRole(
+                panel,
+                local,
+                peer,
+                localId,
+                peerId,
+                localId,
+                peerId,
+                changedLocal,
+                changedPeer
+        );
+    }
+
+    public static void bindByRole(
+            RadioComparePanel panel,
+            RadioSnapshot local,
+            RadioSnapshot peer,
+            String localId,
+            String peerId,
+            String localDisplayName,
+            String peerDisplayName,
+            Set<String> changedLocal,
+            Set<String> changedPeer
     ) {
         RadioSnapshot tx = local;
         RadioSnapshot rx = peer;
-        String txId = localId;
+        String txName = localDisplayName != null ? localDisplayName : localId;
-        String rxId = peerId;
+        String rxName = peerDisplayName != null ? peerDisplayName : peerId;
         Set<String> chTx = changedLocal;
         Set<String> chRx = changedPeer;
         if (StatsExtractor.ROLE_RX.equals(local != null ? local.role : null)) {
             tx = peer;
             rx = local;
-            txId = peerId;
+            txName = peerDisplayName != null ? peerDisplayName : peerId;
-            rxId = localId;
+            rxName = localDisplayName != null ? localDisplayName : localId;
             chTx = changedPeer;
             chRx = changedLocal;
         }
         if (tx == null) tx = RadioSnapshot.empty();
         if (rx == null) rx = RadioSnapshot.empty();
-        panel.bind(tx, rx, txId, rxId, chTx, chRx);
+        panel.bind(tx, rx, txName, rxName, chTx, chRx);
     }
 
     private static String str(String v) {

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

@@ -23,11 +23,13 @@ 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.model.RadioSnapshot;
 import com.grigowashere.loratester.telnet.StatsExtractor;
 
 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;
@@ -43,6 +45,7 @@ public class StatsFragment extends Fragment {
     private PeerStatsCache peerStatsCache;
     private TextView statsStatus;
     private TextView statsPeerWarning;
+    private TextView statsDistance;
     private RadioComparePanel radioComparePanel;
     private RecyclerView statsHistoryList;
     private final HistoryAdapter historyAdapter = new HistoryAdapter();
@@ -54,6 +57,10 @@ public class StatsFragment extends Fragment {
     private String cachedPeerId;
     private String cachedPeerError;
     private int cachedDeviceCount;
+    private String cachedSelfDisplayName;
+    private String cachedPeerDisplayName;
+    private DeviceInfo cachedTxDev;
+    private DeviceInfo cachedRxDev;
 
     private final TelemetryUploader.StatsListener statsListener = stats -> postRender();
 
@@ -80,6 +87,7 @@ public class StatsFragment extends Fragment {
     public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
         statsStatus = view.findViewById(R.id.statsStatus);
         statsPeerWarning = view.findViewById(R.id.statsPeerWarning);
+        statsDistance = view.findViewById(R.id.statsDistance);
         radioComparePanel = view.findViewById(R.id.radioComparePanel);
         statsHistoryList = view.findViewById(R.id.statsHistoryList);
         statsHistoryList.setLayoutManager(new LinearLayoutManager(requireContext()));
@@ -157,6 +165,7 @@ public class StatsFragment extends Fragment {
         }
         statsStatus = null;
         statsPeerWarning = null;
+        statsDistance = null;
         radioComparePanel = null;
         statsHistoryList = null;
         pollHelper = null;
@@ -183,13 +192,17 @@ public class StatsFragment extends Fragment {
         String deviceId = uploader.getDeviceId();
         statsStatus.setText(getString(
                 R.string.stats_status,
-                deviceId,
+                cachedSelfDisplayName != null ? cachedSelfDisplayName : deviceId,
                 uploader.isTelnetConnected()
                         ? getString(R.string.connected) : getString(R.string.disconnected)
         ));
 
         executor.execute(() -> {
             List<TelemetryHistoryItem> history = null;
+            DeviceInfo txDev = null;
+            DeviceInfo rxDev = null;
+            String selfName = deviceId;
+            String peerName = cachedPeerId;
             try {
                 List<DeviceInfo> devices = uploader.getServerApi().getDevices();
                 cachedDeviceCount = devices.size();
@@ -200,12 +213,23 @@ public class StatsFragment extends Fragment {
                 DeviceInfo self = null;
                 DeviceInfo peerDev = null;
                 for (DeviceInfo d : devices) {
+                    if (StatsExtractor.ROLE_TX.equals(d.role)) {
+                        txDev = d;
+                    } else if (StatsExtractor.ROLE_RX.equals(d.role)) {
+                        rxDev = d;
+                    }
                     if (deviceId.equals(d.device_id)) {
                         self = d;
                     } else if (peer.peerId != null && peer.peerId.equals(d.device_id)) {
                         peerDev = d;
                     }
                 }
+                selfName = DeviceNames.displayName(self, deviceId);
+                peerName = DeviceNames.displayName(peerDev, peer.peerId);
+                cachedSelfDisplayName = selfName;
+                cachedPeerDisplayName = peerName;
+                cachedTxDev = txDev;
+                cachedRxDev = rxDev;
 
                 StatsExtractor.ExtractedStats localStats = uploader.getLastStats();
                 snapLocal = localStats != null
@@ -264,10 +288,32 @@ public class StatsFragment extends Fragment {
                 snapPeer,
                 uploader.getDeviceId(),
                 cachedPeerId,
+                cachedSelfDisplayName,
+                cachedPeerDisplayName,
                 chLocal,
                 chPeer
         );
+        updateStatsDistance();
         prevLocal = snapLocal;
         prevPeer = snapPeer;
     }
+
+    private void updateStatsDistance() {
+        if (statsDistance == null) {
+            return;
+        }
+        DeviceInfo tx = cachedTxDev;
+        DeviceInfo rx = cachedRxDev;
+        if (tx != null && rx != null
+                && GeoUtils.isValidCoordinate(tx.lat, tx.lon)
+                && GeoUtils.isValidCoordinate(rx.lat, rx.lon)) {
+            double dist = GeoUtils.haversineMeters(tx.lat, tx.lon, rx.lat, rx.lon);
+            statsDistance.setVisibility(View.VISIBLE);
+            statsDistance.setText(getString(
+                    R.string.stats_gps_distance,
+                    String.format(Locale.US, "%.0f", dist)));
+        } else {
+            statsDistance.setVisibility(View.GONE);
+        }
+    }
 }

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

@@ -80,6 +80,24 @@
             android:textColor="#00FF88"
             android:textSize="9sp"
             android:visibility="gone" />
+
+        <TextView
+            android:id="@+id/mapRxQuality"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="2dp"
+            android:textColor="#4FC3F7"
+            android:textSize="9sp"
+            android:visibility="gone" />
+
+        <TextView
+            android:id="@+id/mapTrackStatus"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="2dp"
+            android:textColor="#FF9800"
+            android:textSize="9sp"
+            android:visibility="gone" />
     </LinearLayout>
 
     <LinearLayout

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

@@ -24,6 +24,15 @@
             android:textSize="12sp"
             android:visibility="gone" />
 
+        <TextView
+            android:id="@+id/statsDistance"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="4dp"
+            android:textColor="#00FF88"
+            android:textSize="13sp"
+            android:visibility="gone" />
+
         <com.grigowashere.loratester.ui.RadioComparePanel
             android:id="@+id/radioComparePanel"
             android:layout_width="match_parent"

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

@@ -37,6 +37,18 @@
     <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="track_offline_started">Запись без сети — точки сохраняются на телефоне</string>
+    <string name="track_sync_pending">Трек сохранён локально — отправится при появлении сети</string>
+    <string name="track_sync_done">Трек #%1$d загружен (%2$d точек)</string>
+    <string name="track_status_online">Трекинг: %1$d точек</string>
+    <string name="track_status_offline">Трекинг: %1$d точек · буфер %2$d · офлайн</string>
+    <string name="track_offline_toast">Сеть пропала — точки сохраняются на устройстве (буфер %1$d). Без ограничения по времени, до ~500 тыс. точек.</string>
+    <string name="track_online_toast">Сеть восстановлена — отправка буфера (%1$d точек)</string>
+    <string name="map_track_status_online">Трек: %1$d точек</string>
+    <string name="map_track_status_offline">Трек: %1$d точек · буфер %2$d</string>
+    <string name="map_rx_quality">RX Quality: %1$s%%</string>
+    <string name="map_rx_quality_unknown">RX Quality: —</string>
+    <string name="stats_gps_distance">Расстояние TX↔RX: %1$s m</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>

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

@@ -0,0 +1,27 @@
+package com.grigowashere.loratester;
+
+import com.grigowashere.loratester.api.DeviceInfo;
+import com.grigowashere.loratester.ui.DeviceNames;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class DeviceNamesTest {
+
+    @Test
+    public void prefersLabelOverDeviceId() {
+        DeviceInfo d = new DeviceInfo();
+        d.device_id = "android-abc123";
+        d.label = "Pixel 7 TX";
+        assertEquals("Pixel 7 TX", DeviceNames.displayName(d, d.device_id));
+    }
+
+    @Test
+    public void fallsBackToDeviceId() {
+        DeviceInfo d = new DeviceInfo();
+        d.device_id = "android-abc123";
+        d.label = "android-abc123";
+        assertEquals("android-abc123", DeviceNames.displayName(d, d.device_id));
+    }
+}

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

@@ -0,0 +1,45 @@
+package com.grigowashere.loratester.track;
+
+import org.junit.Test;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+public class TrackPointQueueTest {
+
+    @Test
+    public void pendingPointRoundTrip() {
+        Map<String, Object> point = new HashMap<>();
+        point.put("ts", 1710000000.5);
+        point.put("lat", 59.93);
+        point.put("lon", 30.33);
+        point.put("altitude_gps", 11.0);
+        point.put("rssi", -90.0);
+        point.put("role", "RX");
+        point.put("meta", "{\"quality\":80}");
+
+        TrackPointQueue.PendingPoint pending = TrackPointQueue.PendingPoint.fromMap(point);
+        Map<String, Object> back = pending.toMap();
+
+        assertEquals(59.93, (Double) back.get("lat"), 1e-6);
+        assertEquals(30.33, (Double) back.get("lon"), 1e-6);
+        assertEquals(11.0, (Double) back.get("altitude_gps"), 1e-6);
+        assertEquals(-90.0, (Double) back.get("rssi"), 1e-6);
+        assertEquals("RX", back.get("role"));
+        assertEquals("{\"quality\":80}", back.get("meta"));
+    }
+
+    @Test
+    public void snapshotDefaults() {
+        TrackPointQueue.Snapshot snap = new TrackPointQueue.Snapshot();
+        assertEquals(-1, snap.trackId);
+        assertFalse(snap.recording);
+        assertEquals(0, snap.totalPoints);
+        assertTrue(snap.pending.isEmpty());
+    }
+}

server/README.md

@@ -22,7 +22,7 @@ python flask_app.py
 | `LORATESTER_PORT` | `7634` |
 | `LORATESTER_DB` | `./loratester.db` |
 | `LORATESTER_TELEMETRY_LIMIT` | `5000` (записей истории на устройство) |
-| `LORATESTER_TRACK_POINTS_LIMIT` | `10000` (точек на один трек) |
+| `LORATESTER_TRACK_POINTS_LIMIT` | `500000` (точек на один трек) |
 | `LORATESTER_ELEVATION_URL` | `http://192.168.1.109:8085/v1/elevation` |
 | `LORATESTER_ELEVATION_PROBE_TTL` | `60` (сек, кэш проверки доступности) |
 | `LORATESTER_ELEVATION_TIMEOUT` | `8` (сек, таймаут HTTP к сервису высот) |
@@ -40,14 +40,17 @@ docker compose up -d --build
 curl http://127.0.0.1:7634/api/health | jq
 ```
 
-Ожидается `"elevation_ok": true` если локальный Open-Meteo доступен с хоста/контейнера.
+Ожидается `"elevation_ok": true` если OpenTopoData (основной) или Open-Meteo (fallback) доступны с хоста/контейнера.
 
 Переопределить URL высот (`.env` рядом с `docker-compose.yml`):
 
 ```env
-LORATESTER_ELEVATION_URL=http://192.168.1.109:8085/v1/elevation
+LORATESTER_ELEVATION_OPENTOPO_URL=http://grigowashere.ru:5300/v1/srtm30
+LORATESTER_ELEVATION_FALLBACK_URL=http://192.168.1.109:8085/v1/elevation
 ```
 
+`LORATESTER_ELEVATION_URL` — устаревший alias для fallback (Open-Meteo-compatible).
+
 БД хранится в volume `loratester-data` (`/data/loratester.db` внутри контейнера).
 
 ## Деплой (lora.grigowashere.ru)
@@ -63,7 +66,8 @@ docker compose up -d --build
 cd /srv/storage/disk2/services/LoraTester/server
 pip install -r requirements.txt
 export LORATESTER_DB=/srv/storage/disk2/services/LoraTester/loratester.db
-export LORATESTER_ELEVATION_URL=http://192.168.1.109:8085/v1/elevation
+export LORATESTER_ELEVATION_OPENTOPO_URL=http://grigowashere.ru:5300/v1/srtm30
+export LORATESTER_ELEVATION_FALLBACK_URL=http://192.168.1.109:8085/v1/elevation
 uvicorn fastapi_app:app --host 0.0.0.0 --port 7634
 ```
 
@@ -95,11 +99,12 @@ curl http://127.0.0.1:7634/api/health
 
 ### Треки (запись с Android)
 
+- `POST /api/tracks/sync` — `{device_id, track_id?, started_at?, points[], finish?}` — офлайн-догрузка точек и завершение трека
 - `POST /api/tracks/start` — `{device_id}` → `{track_id}`
 - `POST /api/tracks/{id}/points` — `{points: [{ts, lat, lon, altitude_gps?, rssi?, role?, meta?}]}`
 - `POST /api/tracks/{id}/finish`
 - `GET /api/tracks?device_id=`
-- `GET /api/tracks/{id}` — метаданные + точки (высота terrain через локальный Open-Meteo)
+- `GET /api/tracks/{id}` — метаданные + точки (высота terrain через OpenTopoData → Open-Meteo fallback)
 
 ### Команды (очередь на устройство)
 
@@ -110,9 +115,9 @@ curl http://127.0.0.1:7634/api/health
 
 ### Профиль высот (веб, треки)
 
-- `POST /api/elevation/profile` — `{points: [{lat, lon}], step_m?: 10}` → срез рельефа (локальный Open-Meteo)
+- `POST /api/elevation/profile` — `{points: [{lat, lon}], step_m?: 10}` → срез рельефа (OpenTopoData → Open-Meteo)
 - `GET /api/tracks/{id}/elevation-profile?step_m=10` — то же по сохранённому треку
-- `GET /api/elevation/nearest-hill?lat=&lon=&radius_m=5000` — ближайшая возвышенность (прокси Open-Meteo)
+- `GET /api/elevation/nearest-hill?lat=&lon=&radius_m=5000` — ближайшая возвышенность
 - `GET /api/elevation/grid?lat=&lon=&radius_m=200&step_m=0` — сетка высот для хитмапы (100–500 m, step_m=0 авто)
 - `GET /api/commands/pending?device_id=` — Android, доставка + `delivered_at`
 - `GET /api/commands?to_device_id=&limit=` — история (веб)

server/core/config.py

@@ -8,11 +8,20 @@ DATABASE_PATH = os.environ.get(
 HOST = os.environ.get("LORATESTER_HOST", "0.0.0.0")
 PORT = int(os.environ.get("LORATESTER_PORT", "7634"))
 TELEMETRY_LIMIT = int(os.environ.get("LORATESTER_TELEMETRY_LIMIT", "5000"))
-TRACK_POINTS_LIMIT = int(os.environ.get("LORATESTER_TRACK_POINTS_LIMIT", "10000"))
+TRACK_POINTS_LIMIT = int(os.environ.get("LORATESTER_TRACK_POINTS_LIMIT", "500000"))
-ELEVATION_API_URL = os.environ.get(
+ELEVATION_OPENTOPO_URL = os.environ.get(
+    "LORATESTER_ELEVATION_OPENTOPO_URL",
+    "http://grigowashere.ru:5300/v1/srtm30",
+).rstrip("/")
+ELEVATION_FALLBACK_URL = os.environ.get(
+    "LORATESTER_ELEVATION_FALLBACK_URL",
+    os.environ.get(
         "LORATESTER_ELEVATION_URL",
         "http://192.168.1.109:8085/v1/elevation",
+    ),
 ).rstrip("/")
+# Backward-compatible alias for Open-Meteo-compatible fallback API.
+ELEVATION_API_URL = ELEVATION_FALLBACK_URL
 ELEVATION_PROBE_TTL_SEC = float(
     os.environ.get("LORATESTER_ELEVATION_PROBE_TTL", "60")
 )

server/core/elevation.py

@@ -1,4 +1,4 @@
-"""Terrain elevation via self-hosted Open-Meteo-compatible API."""
+"""Terrain elevation: OpenTopoData primary, Open-Meteo-compatible fallback."""
 
 from __future__ import annotations
 
@@ -10,8 +10,9 @@ from typing import Any, Optional
 import httpx
 
 from .config import (
-    ELEVATION_API_URL,
     ELEVATION_CONNECT_TIMEOUT,
+    ELEVATION_FALLBACK_URL,
+    ELEVATION_OPENTOPO_URL,
     ELEVATION_PROBE_TTL_SEC,
 )
 
@@ -21,8 +22,11 @@ _BATCH_SIZE = 100
 _MAX_PROFILE_POINTS = 500
 _CACHE: dict[tuple[float, float], Optional[float]] = {}
 _probe_checked_at = 0.0
-_probe_ok = False
+_probe_opentopo_ok = False
-_probe_error: Optional[str] = None
+_probe_opentopo_error: Optional[str] = None
+_probe_fallback_ok = False
+_probe_fallback_error: Optional[str] = None
+_last_fetch_source: Optional[str] = None
 
 
 def _cache_key(lat: float, lon: float) -> tuple[float, float]:
@@ -42,9 +46,8 @@ def haversine_m(lat1: float, lon1: float, lat2: float, lon2: float) -> float:
     return r * 2 * math.atan2(math.sqrt(a), math.sqrt(1 - a))
 
 
-def probe_elevation_api(force: bool = False) -> dict[str, Any]:
+def _probe_opentopodata(force: bool = False) -> dict[str, Any]:
-    """Ping elevation service before batch requests (cached for TTL)."""
+    global _probe_checked_at, _probe_opentopo_ok, _probe_opentopo_error
-    global _probe_checked_at, _probe_ok, _probe_error
 
     now = time.monotonic()
     if (
@@ -53,35 +56,129 @@ def probe_elevation_api(force: bool = False) -> dict[str, Any]:
         and now - _probe_checked_at < ELEVATION_PROBE_TTL_SEC
     ):
         return {
-            "ok": _probe_ok,
+            "ok": _probe_opentopo_ok,
-            "url": ELEVATION_API_URL,
+            "url": ELEVATION_OPENTOPO_URL,
-            "error": _probe_error,
+            "error": _probe_opentopo_error,
         }
 
     try:
         with httpx.Client(timeout=ELEVATION_CONNECT_TIMEOUT) as client:
             r = client.get(
-                ELEVATION_API_URL,
+                ELEVATION_OPENTOPO_URL,
+                params={"locations": "0.000000,0.000000"},
+            )
+            r.raise_for_status()
+            data = r.json()
+            if data.get("status") != "OK":
+                raise ValueError(f"status={data.get('status')}")
+            results = data.get("results") or []
+            if not results or results[0].get("elevation") is None:
+                raise ValueError("response has no elevation values")
+        _probe_opentopo_ok = True
+        _probe_opentopo_error = None
+        logger.info("OpenTopoData ok: %s", ELEVATION_OPENTOPO_URL)
+    except Exception as e:
+        _probe_opentopo_ok = False
+        _probe_opentopo_error = str(e)
+        logger.warning(
+            "OpenTopoData unreachable %s: %s", ELEVATION_OPENTOPO_URL, e
+        )
+
+    return {
+        "ok": _probe_opentopo_ok,
+        "url": ELEVATION_OPENTOPO_URL,
+        "error": _probe_opentopo_error,
+    }
+
+
+def _probe_fallback(force: bool = False) -> dict[str, Any]:
+    global _probe_checked_at, _probe_fallback_ok, _probe_fallback_error
+
+    now = time.monotonic()
+    if (
+        not force
+        and _probe_checked_at > 0
+        and now - _probe_checked_at < ELEVATION_PROBE_TTL_SEC
+    ):
+        return {
+            "ok": _probe_fallback_ok,
+            "url": ELEVATION_FALLBACK_URL,
+            "error": _probe_fallback_error,
+        }
+
+    try:
+        with httpx.Client(timeout=ELEVATION_CONNECT_TIMEOUT) as client:
+            r = client.get(
+                ELEVATION_FALLBACK_URL,
                 params={"latitude": "0.000000", "longitude": "0.000000"},
             )
             r.raise_for_status()
             data = r.json()
             if "elevation" not in data:
                 raise ValueError("response has no elevation field")
-        _probe_checked_at = now
+        _probe_fallback_ok = True
-        _probe_ok = True
+        _probe_fallback_error = None
-        _probe_error = None
+        logger.info("elevation fallback ok: %s", ELEVATION_FALLBACK_URL)
-        logger.info("elevation API ok: %s", ELEVATION_API_URL)
     except Exception as e:
-        _probe_checked_at = now
+        _probe_fallback_ok = False
-        _probe_ok = False
+        _probe_fallback_error = str(e)
-        _probe_error = str(e)
+        logger.warning(
-        logger.warning("elevation API unreachable %s: %s", ELEVATION_API_URL, e)
+            "elevation fallback unreachable %s: %s", ELEVATION_FALLBACK_URL, e
+        )
 
     return {
-        "ok": _probe_ok,
+        "ok": _probe_fallback_ok,
-        "url": ELEVATION_API_URL,
+        "url": ELEVATION_FALLBACK_URL,
-        "error": _probe_error,
+        "error": _probe_fallback_error,
+    }
+
+
+def probe_elevation_api(force: bool = False) -> dict[str, Any]:
+    """Ping elevation providers before batch requests (cached for TTL)."""
+    global _probe_checked_at
+
+    now = time.monotonic()
+    if (
+        not force
+        and _probe_checked_at > 0
+        and now - _probe_checked_at < ELEVATION_PROBE_TTL_SEC
+    ):
+        op = {
+            "ok": _probe_opentopo_ok,
+            "url": ELEVATION_OPENTOPO_URL,
+            "error": _probe_opentopo_error,
+        }
+        fb = {
+            "ok": _probe_fallback_ok,
+            "url": ELEVATION_FALLBACK_URL,
+            "error": _probe_fallback_error,
+        }
+    else:
+        op = _probe_opentopodata(force=True)
+        fb = _probe_fallback(force=True)
+        _probe_checked_at = now
+
+    ok = op["ok"] or fb["ok"]
+    if op["ok"]:
+        url = op["url"]
+        error = None
+    elif fb["ok"]:
+        url = fb["url"]
+        error = None
+    else:
+        url = ELEVATION_OPENTOPO_URL
+        error = f"opentopodata: {op['error']}; fallback: {fb['error']}"
+
+    return {
+        "ok": ok,
+        "url": url,
+        "error": error,
+        "opentopodata_ok": op["ok"],
+        "opentopodata_url": op["url"],
+        "opentopodata_error": op["error"],
+        "fallback_ok": fb["ok"],
+        "fallback_url": fb["url"],
+        "fallback_error": fb["error"],
     }
 
 
@@ -91,10 +188,40 @@ def elevation_status(force: bool = False) -> dict[str, Any]:
         "elevation_ok": probe["ok"],
         "elevation_url": probe["url"],
         "elevation_error": probe["error"],
+        "elevation_opentopodata_ok": probe.get("opentopodata_ok"),
+        "elevation_opentopodata_url": probe.get("opentopodata_url"),
+        "elevation_fallback_ok": probe.get("fallback_ok"),
+        "elevation_fallback_url": probe.get("fallback_url"),
     }
 
 
-def _fetch_elevation_batch(
+def _fetch_opentopodata_batch(
+    batch_lat: list[float], batch_lon: list[float]
+) -> list[Optional[float]]:
+    if not batch_lat:
+        return []
+    locations = "|".join(
+        f"{lat:.6f},{lon:.6f}" for lat, lon in zip(batch_lat, batch_lon)
+    )
+    with httpx.Client(timeout=ELEVATION_CONNECT_TIMEOUT) as client:
+        r = client.get(ELEVATION_OPENTOPO_URL, params={"locations": locations})
+        r.raise_for_status()
+        data = r.json()
+    if data.get("status") != "OK":
+        raise ValueError(f"OpenTopoData status={data.get('status')}")
+    results = data.get("results") or []
+    out: list[Optional[float]] = []
+    for j, item in enumerate(results):
+        if j >= len(batch_lat):
+            break
+        elev = item.get("elevation")
+        out.append(None if elev is None else float(elev))
+    while len(out) < len(batch_lat):
+        out.append(None)
+    return out
+
+
+def _fetch_fallback_batch(
     batch_lat: list[float], batch_lon: list[float]
 ) -> list[Optional[float]]:
     if not batch_lat:
@@ -104,7 +231,7 @@ def _fetch_elevation_batch(
         "longitude": ",".join(f"{lon:.6f}" for lon in batch_lon),
     }
     with httpx.Client(timeout=ELEVATION_CONNECT_TIMEOUT) as client:
-        r = client.get(ELEVATION_API_URL, params=params)
+        r = client.get(ELEVATION_FALLBACK_URL, params=params)
         r.raise_for_status()
         data = r.json()
     elevations = data.get("elevation") or []
@@ -112,15 +239,81 @@ def _fetch_elevation_batch(
     for j, elev in enumerate(elevations):
         if j >= len(batch_lat):
             break
-        if elev is None:
+        out.append(None if elev is None else float(elev))
-            out.append(None)
-        else:
-            out.append(float(elev))
     while len(out) < len(batch_lat):
         out.append(None)
     return out
 
 
+def _fetch_batch_with_fallback(
+    batch_lat: list[float], batch_lon: list[float]
+) -> list[Optional[float]]:
+    global _last_fetch_source
+
+    probe = probe_elevation_api()
+    op_ok = probe.get("opentopodata_ok", False)
+    fb_ok = probe.get("fallback_ok", False)
+    if not op_ok and not fb_ok:
+        return [None] * len(batch_lat)
+
+    out: list[Optional[float]] = [None] * len(batch_lat)
+    used_opentopo = False
+    used_fallback = False
+
+    if op_ok:
+        try:
+            out = _fetch_opentopodata_batch(batch_lat, batch_lon)
+            used_opentopo = any(v is not None for v in out)
+        except Exception as e:
+            logger.warning(
+                "OpenTopoData batch failed (%s points): %s", len(batch_lat), e
+            )
+            out = [None] * len(batch_lat)
+
+    missing_idx = [i for i, v in enumerate(out) if v is None]
+    if missing_idx and fb_ok:
+        miss_lat = [batch_lat[i] for i in missing_idx]
+        miss_lon = [batch_lon[i] for i in missing_idx]
+        try:
+            fb_vals = _fetch_fallback_batch(miss_lat, miss_lon)
+            for j, idx in enumerate(missing_idx):
+                out[idx] = fb_vals[j] if j < len(fb_vals) else None
+            if any(v is not None for v in fb_vals):
+                used_fallback = True
+        except Exception as e:
+            logger.warning(
+                "elevation fallback batch failed (%s points): %s",
+                len(miss_lat),
+                e,
+            )
+
+    if used_opentopo and used_fallback:
+        _last_fetch_source = "opentopodata+openmeteo"
+    elif used_opentopo:
+        _last_fetch_source = "opentopodata"
+    elif used_fallback:
+        _last_fetch_source = "openmeteo"
+    else:
+        _last_fetch_source = None
+
+    return out
+
+
+def _active_elevation_url() -> str:
+    probe = probe_elevation_api()
+    if probe.get("opentopodata_ok"):
+        return ELEVATION_OPENTOPO_URL
+    if probe.get("fallback_ok"):
+        return ELEVATION_FALLBACK_URL
+    return ELEVATION_OPENTOPO_URL
+
+
+def _active_api_source() -> str:
+    return _last_fetch_source or (
+        "opentopodata" if probe_elevation_api().get("opentopodata_ok") else "openmeteo"
+    )
+
+
 def fetch_elevation_m(lat: float, lon: float) -> Optional[float]:
     vals = fetch_elevations_batch([lat], [lon])
     return vals[0] if vals else None
@@ -135,7 +328,7 @@ def fetch_elevations_batch(
     probe = probe_elevation_api()
     if not probe["ok"]:
         logger.warning(
-            "skip elevation fetch: API unreachable (%s)",
+            "skip elevation fetch: all providers unreachable (%s)",
             probe.get("error"),
         )
         return [None] * len(lats)
@@ -159,14 +352,15 @@ def fetch_elevations_batch(
         batch_lat = pending_lat[start : start + _BATCH_SIZE]
         batch_lon = pending_lon[start : start + _BATCH_SIZE]
         try:
-            batch_vals = _fetch_elevation_batch(batch_lat, batch_lon)
+            batch_vals = _fetch_batch_with_fallback(batch_lat, batch_lon)
             for j, val in enumerate(batch_vals):
                 lat = batch_lat[j]
                 lon = batch_lon[j]
                 _CACHE[_cache_key(lat, lon)] = val
                 out[batch_i[j]] = val
             logger.info(
-                "elevation ok: %s points, sample=%s",
+                "elevation ok (%s): %s points, sample=%s",
+                _last_fetch_source,
                 len(batch_lat),
                 batch_vals[0] if batch_vals else None,
             )
@@ -178,7 +372,7 @@ def fetch_elevations_batch(
             )
             for j in range(len(batch_lat)):
                 try:
-                    single = _fetch_elevation_batch(
+                    single = _fetch_batch_with_fallback(
                         [batch_lat[j]], [batch_lon[j]]
                     )
                     val = single[0] if single else None
@@ -329,7 +523,7 @@ def build_elevation_profile(
             "total_m": 0.0,
             "api_source": "elevation",
             "api_error": f"elevation API unreachable: {probe['error']}",
-            "elevation_url": ELEVATION_API_URL,
+            "elevation_url": _active_elevation_url(),
         }
 
     lats = [s["lat"] for s in samples]
@@ -356,8 +550,8 @@ def build_elevation_profile(
         "min_elevation_m": min(elev_vals) if elev_vals else None,
         "max_elevation_m": max(elev_vals) if elev_vals else None,
         "points": profile,
-        "api_source": "elevation",
+        "api_source": _active_api_source(),
-        "elevation_url": ELEVATION_API_URL,
+        "elevation_url": _active_elevation_url(),
     }
     if not elev_vals:
         result["api_error"] = "elevation API returned no values"
@@ -429,7 +623,7 @@ def build_elevation_grid(
         return {
             "ok": False,
             "error": f"elevation API unreachable: {probe['error']}",
-            "elevation_url": ELEVATION_API_URL,
+            "elevation_url": _active_elevation_url(),
         }
 
     radius_m = max(50.0, min(float(radius_m), 500.0))
@@ -481,8 +675,8 @@ def build_elevation_grid(
         "points": points,
         "min_delta_m": round(min(deltas), 1),
         "max_delta_m": round(max(deltas), 1),
-        "api_source": "elevation",
+        "api_source": _active_api_source(),
-        "elevation_url": ELEVATION_API_URL,
+        "elevation_url": _active_elevation_url(),
     }
 
 
@@ -499,7 +693,7 @@ def find_nearest_hill(
         return {
             "ok": False,
             "error": f"elevation API unreachable: {probe['error']}",
-            "elevation_url": ELEVATION_API_URL,
+            "elevation_url": _active_elevation_url(),
         }
 
     radius_m = max(500.0, min(float(radius_m), 15_000.0))
@@ -590,6 +784,6 @@ def find_nearest_hill(
         "candidates": len(candidates),
         "radius_m": radius_m,
         "step_m": step_m,
-        "api_source": "elevation",
+        "api_source": _active_api_source(),
-        "elevation_url": ELEVATION_API_URL,
+        "elevation_url": _active_elevation_url(),
     }

server/core/storage.py

@@ -353,6 +353,79 @@ def finish_track(track_id: int) -> dict[str, Any]:
     return {"ok": True, "track_id": track_id, "ended_at": ts, "point_count": count}
 
 
+def sync_track(
+    device_id: str,
+    points: list[dict[str, Any]],
+    track_id: Optional[int] = None,
+    started_at: Optional[float] = None,
+    finish: bool = False,
+    label: Optional[str] = None,
+) -> dict[str, Any]:
+    """Upload buffered points after offline recording; optionally create track and finish."""
+    if not is_valid_device_id(device_id):
+        raise ValueError(f"invalid device_id '{device_id}'")
+    points = points or []
+
+    if track_id is not None:
+        with _db() as conn:
+            track = conn.execute(
+                "SELECT id, device_id, ended_at FROM tracks WHERE id = ?",
+                (track_id,),
+            ).fetchone()
+            if not track:
+                raise ValueError(f"track {track_id} not found")
+            if track["device_id"] != device_id:
+                raise ValueError("device_id does not match track owner")
+            if track["ended_at"] is not None:
+                raise ValueError(f"track {track_id} already finished")
+    else:
+        if not points and not finish:
+            raise ValueError("points required when creating a new track")
+        ts = float(started_at) if started_at is not None else time.time()
+        with _db() as conn:
+            cur = conn.execute(
+                """
+                INSERT INTO tracks (device_id, started_at, label)
+                VALUES (?, ?, ?)
+                """,
+                (device_id, ts, label),
+            )
+            track_id = int(cur.lastrowid)
+
+    added = 0
+    batch_size = 100
+    for i in range(0, len(points), batch_size):
+        chunk = points[i : i + batch_size]
+        if not chunk:
+            continue
+        result = add_track_points(track_id, chunk)
+        added += int(result.get("added") or 0)
+
+    finished = False
+    ended_at = None
+    point_count = added
+    if finish:
+        fin = finish_track(track_id)
+        finished = True
+        ended_at = fin.get("ended_at")
+        point_count = int(fin.get("point_count") or 0)
+    else:
+        with _db() as conn:
+            point_count = conn.execute(
+                "SELECT COUNT(*) FROM track_points WHERE track_id = ?",
+                (track_id,),
+            ).fetchone()[0]
+
+    return {
+        "ok": True,
+        "track_id": track_id,
+        "added": added,
+        "point_count": point_count,
+        "finished": finished,
+        "ended_at": ended_at,
+    }
+
+
 def list_tracks(device_id: Optional[str] = None, limit: int = 50) -> list[dict[str, Any]]:
     limit = min(max(1, limit), 200)
     with _db() as conn:

server/docker-compose.yml

@@ -10,11 +10,13 @@ services:
     environment:
       LORATESTER_DB: /data/loratester.db
       LORATESTER_PORT: "7634"
+      LORATESTER_ELEVATION_OPENTOPO_URL: ${LORATESTER_ELEVATION_OPENTOPO_URL:-http://grigowashere.ru:5300/v1/srtm30}
+      LORATESTER_ELEVATION_FALLBACK_URL: ${LORATESTER_ELEVATION_FALLBACK_URL:-http://192.168.1.109:8085/v1/elevation}
       LORATESTER_ELEVATION_URL: ${LORATESTER_ELEVATION_URL:-http://192.168.1.109:8085/v1/elevation}
       LORATESTER_ELEVATION_PROBE_TTL: ${LORATESTER_ELEVATION_PROBE_TTL:-60}
       LORATESTER_ELEVATION_TIMEOUT: ${LORATESTER_ELEVATION_TIMEOUT:-8}
       LORATESTER_TELEMETRY_LIMIT: ${LORATESTER_TELEMETRY_LIMIT:-5000}
-      LORATESTER_TRACK_POINTS_LIMIT: ${LORATESTER_TRACK_POINTS_LIMIT:-10000}
+      LORATESTER_TRACK_POINTS_LIMIT: ${LORATESTER_TRACK_POINTS_LIMIT:-500000}
 
 volumes:
   loratester-data:

server/fastapi_app.py

@@ -72,6 +72,15 @@ class TrackPointsBody(BaseModel):
     points: list[TrackPoint] = Field(default_factory=list)
 
 
+class TrackSyncBody(BaseModel):
+    device_id: str
+    track_id: Optional[int] = None
+    started_at: Optional[float] = None
+    points: list[TrackPoint] = Field(default_factory=list)
+    finish: bool = False
+    label: Optional[str] = None
+
+
 class CommandBody(BaseModel):
     from_device_id: str
     to_device_id: str
@@ -193,6 +202,26 @@ def tracks_finish(
         raise HTTPException(400, detail=str(e)) from e
 
 
+@app.post("/api/tracks/sync")
+def tracks_sync(
+    body: TrackSyncBody,
+    x_lora_client: Optional[str] = Header(None, alias=ANDROID_CLIENT_HEADER),
+):
+    _require_android(x_lora_client)
+    try:
+        points = [p.model_dump(exclude_none=True) for p in body.points]
+        return storage.sync_track(
+            body.device_id,
+            points,
+            track_id=body.track_id,
+            started_at=body.started_at,
+            finish=body.finish,
+            label=body.label,
+        )
+    except ValueError as e:
+        raise HTTPException(400, detail=str(e)) from e
+
+
 @app.get("/api/tracks")
 def tracks_list(
     device_id: Optional[str] = None,
@@ -379,7 +408,7 @@ def health():
     return {
         "ok": status["db_ok"],
         "ts": time.time(),
-        "api_build": "2026-06-16g",
+        "api_build": "2026-06-19a",
         **status,
         **elevation_status(),
     }

server/static/index.html

@@ -45,7 +45,17 @@
     }
     #elevationStatus { font-size: 0.7rem; color: #aaa; font-weight: 400; }
     #elevationCanvas { width: 100%; height: 130px; display: block; background: #0a0a14; border-radius: 4px; }
+    #elevationCanvas.elev-probe { cursor: crosshair; }
     .elev-legend { font-size: 0.7rem; }
+    #qualityVizPanel {
+      display: none; margin-top: 8px;
+    }
+    #qualityVizPanel.visible { display: block; }
+    .quality-viz-box {
+      background: #0f3460; border: 1px solid #444; border-radius: 6px; padding: 6px;
+    }
+    .quality-viz-title { font-size: 0.7rem; color: #aaa; margin-bottom: 4px; }
+    #qualityDistCanvas { width: 100%; height: 140px; display: block; background: #0a0a14; border-radius: 4px; }
     #timelineStatsPanel {
       display: none; margin-top: 10px; padding-top: 10px; border-top: 1px solid #333;
     }
@@ -106,8 +116,8 @@
     #pairedStatus { font-size: 0.75rem; color: #aaa; margin-top: 4px; }
     .muted { color: #aaa; font-size: 0.75rem; }
     .legend { font-size: 0.75rem; color: #ccc; }
-    .legend-tx { color: #e94560; }
+    .legend-tx { color: #4fc3f7; }
-    .legend-rx { color: #4fc3f7; }
+    .legend-rx { color: #e94560; }
     #mapModal {
       display: none; position: fixed; z-index: 2000;
       min-width: 260px; max-width: 360px; max-height: 70vh; overflow: auto;
@@ -320,6 +330,12 @@
           </div>
           <canvas id="elevationCanvas" width="800" height="130"></canvas>
         </div>
+        <div id="qualityVizPanel">
+          <div class="quality-viz-box">
+            <div class="quality-viz-title">RX Quality vs расстояние TX↔RX</div>
+            <canvas id="qualityDistCanvas" width="800" height="140"></canvas>
+          </div>
+        </div>
       </div>
     </div>
   </main>
@@ -332,6 +348,7 @@
   </div>
   <script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js"></script>
   <script src="/static/radio-ui.js"></script>
+  <script src="/static/quality-viz.js"></script>
   <script>
     if (typeof RadioUI === 'undefined') {
       console.error('radio-ui.js not loaded — check /static/radio-ui.js');
@@ -361,7 +378,7 @@
       { position: 'topright', collapsed: true }
     ).addTo(map);
 
-    const API_BUILD = '2026-06-16g';
+    const API_BUILD = '2026-06-16i';
 
     const markers = {};
     let selectedId = null;
@@ -430,14 +447,22 @@
     let mapRulerPointsAuto = true;
     let mapRulerManualPoints = 100;
     let mapRulerReloadTimer = null;
+    let timelineElevHoverDist = null;
+    let timelineElevCursorMarker = null;
+    let timelineElevBaseStatus = '';
+    let timelineLinkTxPos = null;
+    let timelineLinkRxPos = null;
+    let timelineElevLeaveTimer = null;
+    let timelineElevChartHover = false;
+    let qualitySamplesCache = [];
 
     const DEVICE_POLL_MS = 1000;
     const CHAT_POLL_MS = 2500;
     const TRACKS_POLL_MS = 10000;
     const TELEMETRY_POLL_MS = 2000;
 
-    const TX_COLOR = '#e94560';
+    const TX_COLOR = '#4fc3f7';
-    const RX_COLOR = '#4fc3f7';
+    const RX_COLOR = '#e94560';
 
     map.on('zoomend moveend', () => {
       if (!programmaticMove) userMovedMap = true;
@@ -1092,6 +1117,114 @@
       }
     }
 
+    function clearTimelineElevCursorMarker() {
+      if (timelineElevCursorMarker) {
+        map.removeLayer(timelineElevCursorMarker);
+        timelineElevCursorMarker = null;
+      }
+    }
+
+    function updateTimelineElevCursorMarker(pt) {
+      clearTimelineElevCursorMarker();
+      timelineElevCursorMarker = L.circleMarker([pt.lat, pt.lon], {
+        radius: 8,
+        color: '#fff',
+        weight: 2,
+        fillColor: '#00ff88',
+        fillOpacity: 0.95,
+        interactive: false
+      }).addTo(map);
+    }
+
+    function setTimelineElevCursor(distM) {
+      if (!dualTracksActive || !timelineLinkTxPos || !timelineLinkRxPos
+          || elevationPointCount(elevProfileLink) === 0) return;
+      const total = elevProfileLink.total_m
+        || lineLengthM(timelineLinkTxPos, timelineLinkRxPos);
+      timelineElevHoverDist = Math.max(0, Math.min(distM, total));
+      const pt = latLonAtLineDist(
+        timelineLinkTxPos, timelineLinkRxPos, timelineElevHoverDist);
+      updateTimelineElevCursorMarker(pt);
+      const elev = elevationAtDist(elevProfileLink, timelineElevHoverDist);
+      if (elev != null) {
+        setElevationStatus(`${timelineElevHoverDist.toFixed(0)} m · ${elev.toFixed(1)} m`);
+      }
+      drawElevationChart();
+    }
+
+    function scheduleClearTimelineElevCursor() {
+      clearTimeout(timelineElevLeaveTimer);
+      timelineElevLeaveTimer = setTimeout(() => {
+        if (timelineElevChartHover) return;
+        timelineElevHoverDist = null;
+        clearTimelineElevCursorMarker();
+        setElevationStatus(timelineElevBaseStatus);
+        drawElevationChart();
+      }, 60);
+    }
+
+    function updateElevationProbeClass() {
+      const canvas = document.getElementById('elevationCanvas');
+      if (!canvas) return;
+      canvas.classList.toggle(
+        'elev-probe',
+        dualTracksActive && elevationPointCount(elevProfileLink) > 0
+      );
+    }
+
+    function buildQualitySamples() {
+      if (!dualTracksActive || !loadedTxTrack?.points?.length || !loadedRxTrack?.points?.length) {
+        return [];
+      }
+      const samples = [];
+      const steps = Math.min(
+        200,
+        Math.max(loadedTxTrack.points.length, loadedRxTrack.points.length, 2) - 1
+      );
+      for (let i = 0; i <= steps; i++) {
+        const cursor = timelineUseProgress
+          ? { progress: i / steps }
+          : { t: overlapMin + (i / steps) * Math.max(overlapMax - overlapMin, 1e-6) };
+        const txPos = positionAtCursor(loadedTxTrack.points, cursor);
+        const rxPos = positionAtCursor(loadedRxTrack.points, cursor);
+        if (!txPos || !rxPos) continue;
+        const quality = rxQualityFromMeta(rxPos.meta);
+        if (quality == null) continue;
+        const distM = haversineM(txPos.lat, txPos.lon, rxPos.lat, rxPos.lon);
+        samples.push({ distM, quality });
+      }
+      return samples;
+    }
+
+    function currentTimelineLinkDist() {
+      if (!timelineLinkTxPos || !timelineLinkRxPos) return null;
+      return haversineM(
+        timelineLinkTxPos.lat, timelineLinkTxPos.lon,
+        timelineLinkRxPos.lat, timelineLinkRxPos.lon);
+    }
+
+    function redrawQualityDistHighlight() {
+      if (!dualTracksActive) return;
+      const distCanvas = document.getElementById('qualityDistCanvas');
+      if (!distCanvas) return;
+      QualityViz.drawQualityDistChart(
+        distCanvas, qualitySamplesCache, qualityColor, currentTimelineLinkDist());
+    }
+
+    function rebuildQualityViz() {
+      const panel = document.getElementById('qualityVizPanel');
+      if (!dualTracksActive) {
+        panel?.classList.remove('visible');
+        qualitySamplesCache = [];
+        return;
+      }
+      qualitySamplesCache = buildQualitySamples();
+      const distCanvas = document.getElementById('qualityDistCanvas');
+      QualityViz.drawQualityDistChart(
+        distCanvas, qualitySamplesCache, qualityColor, currentTimelineLinkDist());
+      panel?.classList.add('visible');
+    }
+
     function scheduleClearMapRulerCursor() {
       clearTimeout(mapRulerLeaveTimer);
       mapRulerLeaveTimer = setTimeout(() => {
@@ -1533,6 +1666,7 @@
             profile: elevProfileLink,
             label: 'рельеф TX↔RX',
             losLine: elevA != null && elevB != null ? { elevA, elevB } : null,
+            cursor: timelineElevHoverDist,
           });
           return series;
         }
@@ -1785,8 +1919,11 @@
       if (n > 0) {
         const src = profile.source === 'elevation' ? 'высоты'
           : profile.source === 'server' ? 'сервер' : (profile.source || 'данные');
-        setElevationStatus(`срез TX↔RX · ${dist.toFixed(0)} m · ${src} · ${n} точек · оранжевая — прямая`);
+        timelineElevBaseStatus =
+          `срез TX↔RX · ${dist.toFixed(0)} m · ${src} · ${n} точек · оранжевая — прямая`;
+        setElevationStatus(timelineElevBaseStatus);
       }
+      updateElevationProbeClass();
     }
 
     async function loadElevationProfiles() {
@@ -1821,7 +1958,14 @@
           : ref?.source === 'server' ? 'сервер' : (ref?.source || 'данные');
         if (dualTracksActive && elevProfileLink) {
           const n = elevationPointCount(elevProfileLink);
-          setElevationStatus(`срез TX↔RX · ${srcLabel} · ${n} точек · оранжевая — прямая`);
+          const dist = timelineLinkTxPos && timelineLinkRxPos
+            ? haversineM(
+              timelineLinkTxPos.lat, timelineLinkTxPos.lon,
+              timelineLinkRxPos.lat, timelineLinkRxPos.lon)
+            : (elevProfileLink.total_m || 0);
+          timelineElevBaseStatus =
+            `срез TX↔RX · ${dist.toFixed(0)} m · ${srcLabel} · ${n} точек · оранжевая — прямая`;
+          setElevationStatus(timelineElevBaseStatus);
         } else if (dualTracksActive && elevProfileTx && elevProfileRx) {
           const nTx = elevationPointCount(elevProfileTx);
           const nRx = elevationPointCount(elevProfileRx);
@@ -1835,6 +1979,7 @@
         setElevationStatus(err ? `ошибка: ${err}` : 'нет данных');
       }
       drawElevationChart();
+      updateElevationProbeClass();
       requestAnimationFrame(() => drawElevationChart(
         singleTrackActive
           ? { single: trackDistanceAtCursor(loadedSingleTrack, timelineCursor()) }
@@ -2132,6 +2277,14 @@
       elevProfileSingle = null;
       elevProfileLink = null;
       elevProfileLinkKey = null;
+      timelineElevHoverDist = null;
+      timelineLinkTxPos = null;
+      timelineLinkRxPos = null;
+      timelineElevBaseStatus = '';
+      clearTimelineElevCursorMarker();
+      qualitySamplesCache = [];
+      document.getElementById('qualityVizPanel')?.classList.remove('visible');
+      updateElevationProbeClass();
       drawElevationChart();
       if (playTimer) {
         clearInterval(playTimer);
@@ -2237,12 +2390,14 @@
 
       if (txPos) {
         ghostTx = L.circleMarker([txPos.lat, txPos.lon], {
-          radius: 10, color: TX_COLOR, fillColor: TX_COLOR, fillOpacity: 0.9, weight: 3
+          radius: 10, color: '#fff', fillColor: TX_COLOR, fillOpacity: 0.95, weight: 3
         }).addTo(map);
       }
       if (rxPos) {
+        const q = rxQualityFromMeta(rxPos.meta);
+        const rxGhostColor = q != null ? (qualityColor(q) || RX_COLOR) : RX_COLOR;
         ghostRx = L.circleMarker([rxPos.lat, rxPos.lon], {
-          radius: 10, color: RX_COLOR, fillColor: RX_COLOR, fillOpacity: 0.9, weight: 3
+          radius: 10, color: '#fff', fillColor: rxGhostColor, fillOpacity: 0.95, weight: 3
         }).addTo(map);
       }
       if (txPos && rxPos) {
@@ -2268,11 +2423,18 @@
         deviceDisplayName(loadedTxTrack?.device_id),
         deviceDisplayName(loadedRxTrack?.device_id)
       ));
+      timelineLinkTxPos = txPos || null;
+      timelineLinkRxPos = rxPos || null;
+
       if (txPos && rxPos) {
-        scheduleLinkElevation(txPos, rxPos).then(() => drawElevationChart());
+        scheduleLinkElevation(txPos, rxPos).then(() => {
+          drawElevationChart();
+          updateElevationProbeClass();
+        });
       } else {
         drawElevationChart();
       }
+      redrawQualityDistHighlight();
     }
 
     function updateTimelineAtSingle(cursor, openModal) {
@@ -2316,9 +2478,14 @@
     function setTimelineVisible(visible) {
       document.getElementById('trackTimeline').classList.toggle('visible', visible);
       document.getElementById('timelineStatsPanel').classList.toggle('visible', visible);
+      document.getElementById('qualityVizPanel')?.classList.toggle(
+        'visible', visible && dualTracksActive);
       setTimeout(() => {
         map.invalidateSize();
-        if (visible) drawElevationChart();
+        if (visible) {
+          drawElevationChart();
+          if (dualTracksActive) rebuildQualityViz();
+        }
       }, 80);
     }
 
@@ -2419,6 +2586,7 @@
       setTimelineVisible(true);
       updateTimelineAt(timelineCursor());
       loadElevationProfiles();
+      rebuildQualityViz();
     }
 
     async function refreshTimelineTelemetry() {
@@ -2595,6 +2763,7 @@
         updateTimelineAt(timelineCursor());
       }
 
+      rebuildQualityViz();
       const modeHint = range && range.mode === 'union' ? ' · без пересечения по времени' : '';
       document.getElementById('trackInfo').textContent =
         `TX #${loadedTxTrack.id} (${loadedTxTrack.points.length}) + RX #${loadedRxTrack.id} (${loadedRxTrack.points.length})${modeHint}`;
@@ -2689,6 +2858,26 @@
       });
     })();
 
+    (function bindTimelineElevationProbe() {
+      const canvas = document.getElementById('elevationCanvas');
+      if (!canvas) return;
+      canvas.addEventListener('mousemove', e => {
+        if (!dualTracksActive || elevationPointCount(elevProfileLink) === 0) return;
+        const layout = canvas._elevLayout;
+        if (!layout || layout.plotW <= 0) return;
+        timelineElevChartHover = true;
+        clearTimeout(timelineElevLeaveTimer);
+        const rect = canvas.getBoundingClientRect();
+        const x = e.clientX - rect.left;
+        const dist = ((x - layout.margin.l) / layout.plotW) * layout.maxDist;
+        setTimelineElevCursor(dist);
+      });
+      canvas.addEventListener('mouseleave', () => {
+        timelineElevChartHover = false;
+        scheduleClearTimelineElevCursor();
+      });
+    })();
+
     (function bindMapRulerChartProbe() {
       const canvas = document.getElementById('mapRulerCanvas');
       if (!canvas) return;

server/static/quality-viz.js

@@ -0,0 +1,96 @@
+/** RX quality vs distance chart for TX/RX track compare. */
+(function (global) {
+  'use strict';
+
+  function drawQualityDistChart(canvas, samples, qualityColor, highlightDist) {
+    if (!canvas) return;
+    const ctx = canvas.getContext('2d');
+    const w = canvas.clientWidth || 280;
+    const h = canvas.clientHeight || 140;
+    if (canvas.width !== w) canvas.width = w;
+    if (canvas.height !== h) canvas.height = h;
+    ctx.fillStyle = '#0a0a14';
+    ctx.fillRect(0, 0, w, h);
+
+    if (!samples?.length) {
+      ctx.fillStyle = '#888';
+      ctx.font = '11px system-ui';
+      ctx.fillText('нет данных качества', 12, h / 2);
+      return;
+    }
+
+    const dists = samples.map(s => s.distM);
+    const minD = Math.min(...dists);
+    const maxD = Math.max(...dists);
+    const span = Math.max(maxD - minD, 1);
+    const binCount = Math.min(20, Math.max(5, Math.ceil(span / 10)));
+    const binW = span / binCount;
+    const bins = Array.from({ length: binCount }, (_, i) => ({
+      min: minD + i * binW,
+      max: minD + (i + 1) * binW,
+      qualities: [],
+    }));
+    for (const s of samples) {
+      let idx = Math.floor((s.distM - minD) / binW);
+      if (idx >= binCount) idx = binCount - 1;
+      if (idx < 0) idx = 0;
+      bins[idx].qualities.push(s.quality);
+    }
+
+    const margin = { l: 36, r: 8, t: 16, b: 22 };
+    const plotW = w - margin.l - margin.r;
+    const plotH = h - margin.t - margin.b;
+
+    ctx.strokeStyle = '#333';
+    ctx.beginPath();
+    ctx.moveTo(margin.l, margin.t);
+    ctx.lineTo(margin.l, margin.t + plotH);
+    ctx.lineTo(margin.l + plotW, margin.t + plotH);
+    ctx.stroke();
+
+    ctx.fillStyle = '#888';
+    ctx.font = '9px system-ui';
+    ctx.fillText('0%', 2, margin.t + plotH);
+    ctx.fillText('100%', 2, margin.t + 8);
+    ctx.fillText(`${Math.round(minD)}m`, margin.l, h - 2);
+    ctx.fillText(`${Math.round(maxD)}m`, margin.l + plotW - 24, h - 2);
+    ctx.fillStyle = '#ccc';
+    ctx.font = '10px system-ui';
+    ctx.fillText('RX Quality vs расстояние', margin.l, margin.t - 4);
+
+    const barW = plotW / binCount * 0.75;
+    bins.forEach((b, i) => {
+      if (!b.qualities.length) return;
+      const avg = b.qualities.reduce((a, v) => a + v, 0) / b.qualities.length;
+      const cx = margin.l + (i + 0.5) / binCount * plotW;
+      const barH = (avg / 100) * plotH;
+      const x = cx - barW / 2;
+      const y = margin.t + plotH - barH;
+      const col = qualityColor ? qualityColor(avg) : '#888';
+      const highlight = highlightDist != null
+        && highlightDist >= b.min && highlightDist < b.max;
+      ctx.fillStyle = col;
+      ctx.globalAlpha = highlight ? 1 : 0.75;
+      ctx.fillRect(x, y, barW, barH);
+      ctx.globalAlpha = 1;
+      if (highlight) {
+        ctx.strokeStyle = '#fff';
+        ctx.lineWidth = 1.5;
+        ctx.strokeRect(x, y, barW, barH);
+      }
+    });
+
+    ctx.fillStyle = 'rgba(255,255,255,0.25)';
+    samples.forEach(s => {
+      const x = margin.l + ((s.distM - minD) / span) * plotW;
+      const y = margin.t + plotH - (s.quality / 100) * plotH;
+      ctx.beginPath();
+      ctx.arc(x, y, 1.5, 0, Math.PI * 2);
+      ctx.fill();
+    });
+  }
+
+  global.QualityViz = {
+    drawQualityDistChart,
+  };
+})(typeof window !== 'undefined' ? window : globalThis);

server/tests/test_elevation.py

@@ -23,6 +23,16 @@ class _FakeClient:
         return False
 
     def get(self, url, params=None):
+        params = params or {}
+        if "locations" in params:
+            locs = params["locations"].split("|")
+            return _FakeResponse({
+                "status": "OK",
+                "results": [
+                    {"elevation": 11.0 + i, "location": {"lat": 0, "lng": 0}}
+                    for i, _ in enumerate(locs)
+                ],
+            })
         return _FakeResponse({"elevation": [152.0]})
 
 
@@ -34,13 +44,20 @@ def test_probe_elevation_api_ok(monkeypatch):
 
     assert status["ok"] is True
     assert status["error"] is None
+    assert status["opentopodata_ok"] is True
 
 
 def test_fetch_skips_when_unreachable(monkeypatch):
     monkeypatch.setattr(
         elev,
         "probe_elevation_api",
-        lambda force=False: {"ok": False, "url": elev.ELEVATION_API_URL, "error": "down"},
+        lambda force=False: {
+            "ok": False,
+            "url": elev.ELEVATION_OPENTOPO_URL,
+            "error": "down",
+            "opentopodata_ok": False,
+            "fallback_ok": False,
+        },
     )
 
     vals = elev.fetch_elevations_batch([55.75], [37.62])
@@ -52,7 +69,13 @@ def test_build_profile_reports_unreachable(monkeypatch):
     monkeypatch.setattr(
         elev,
         "probe_elevation_api",
-        lambda force=False: {"ok": False, "url": elev.ELEVATION_API_URL, "error": "down"},
+        lambda force=False: {
+            "ok": False,
+            "url": elev.ELEVATION_OPENTOPO_URL,
+            "error": "down",
+            "opentopodata_ok": False,
+            "fallback_ok": False,
+        },
     )
 
     profile = elev.build_elevation_profile(
@@ -76,7 +99,16 @@ def test_resample_track_path_count_even_spacing():
 
 def test_build_profile_target_points(monkeypatch):
     monkeypatch.setattr(elev, "_probe_checked_at", 0.0)
-    monkeypatch.setattr(elev, "probe_elevation_api", lambda force=False: {"ok": True, "error": None})
+    monkeypatch.setattr(
+        elev,
+        "probe_elevation_api",
+        lambda force=False: {
+            "ok": True,
+            "error": None,
+            "opentopodata_ok": True,
+            "fallback_ok": True,
+        },
+    )
     monkeypatch.setattr(
         elev,
         "fetch_elevations_batch",
@@ -96,7 +128,13 @@ def test_find_nearest_hill_unreachable(monkeypatch):
     monkeypatch.setattr(
         elev,
         "probe_elevation_api",
-        lambda force=False: {"ok": False, "url": elev.ELEVATION_API_URL, "error": "down"},
+        lambda force=False: {
+            "ok": False,
+            "url": elev.ELEVATION_OPENTOPO_URL,
+            "error": "down",
+            "opentopodata_ok": False,
+            "fallback_ok": False,
+        },
     )
     result = elev.find_nearest_hill(55.75, 37.62)
     assert result["ok"] is False
@@ -104,7 +142,16 @@ def test_find_nearest_hill_unreachable(monkeypatch):
 
 def test_find_nearest_hill_picks_nearest_peak(monkeypatch):
     monkeypatch.setattr(elev, "_probe_checked_at", 0.0)
-    monkeypatch.setattr(elev, "probe_elevation_api", lambda force=False: {"ok": True, "error": None})
+    monkeypatch.setattr(
+        elev,
+        "probe_elevation_api",
+        lambda force=False: {
+            "ok": True,
+            "error": None,
+            "opentopodata_ok": True,
+            "fallback_ok": True,
+        },
+    )
 
     def fake_batch(lats, lons):
         out = []
@@ -125,7 +172,16 @@ def test_find_nearest_hill_picks_nearest_peak(monkeypatch):
 
 def test_build_elevation_grid_delta(monkeypatch):
     monkeypatch.setattr(elev, "_probe_checked_at", 0.0)
-    monkeypatch.setattr(elev, "probe_elevation_api", lambda force=False: {"ok": True, "error": None})
+    monkeypatch.setattr(
+        elev,
+        "probe_elevation_api",
+        lambda force=False: {
+            "ok": True,
+            "error": None,
+            "opentopodata_ok": True,
+            "fallback_ok": True,
+        },
+    )
 
     def fake_batch(lats, lons):
         return [100.0 + (la - 55.75) * 1000.0 for la, lo in zip(lats, lons)]
@@ -143,7 +199,16 @@ def test_build_elevation_grid_delta(monkeypatch):
 
 def test_build_elevation_grid_fine_step_small_radius(monkeypatch):
     monkeypatch.setattr(elev, "_probe_checked_at", 0.0)
-    monkeypatch.setattr(elev, "probe_elevation_api", lambda force=False: {"ok": True, "error": None})
+    monkeypatch.setattr(
+        elev,
+        "probe_elevation_api",
+        lambda force=False: {
+            "ok": True,
+            "error": None,
+            "opentopodata_ok": True,
+            "fallback_ok": True,
+        },
+    )
     monkeypatch.setattr(elev, "fetch_elevation_m", lambda lat, lon: 120.0)
     monkeypatch.setattr(
         elev,
@@ -159,7 +224,16 @@ def test_build_elevation_grid_fine_step_small_radius(monkeypatch):
 
 def test_build_elevation_grid_limits_points(monkeypatch):
     monkeypatch.setattr(elev, "_probe_checked_at", 0.0)
-    monkeypatch.setattr(elev, "probe_elevation_api", lambda force=False: {"ok": True, "error": None})
+    monkeypatch.setattr(
+        elev,
+        "probe_elevation_api",
+        lambda force=False: {
+            "ok": True,
+            "error": None,
+            "opentopodata_ok": True,
+            "fallback_ok": True,
+        },
+    )
     monkeypatch.setattr(elev, "fetch_elevation_m", lambda lat, lon: 50.0)
     monkeypatch.setattr(
         elev,
@@ -170,3 +244,31 @@ def test_build_elevation_grid_limits_points(monkeypatch):
     step = elev._resolve_grid_step(55.75, 37.62, 500.0, 5.0)
     cells = elev._sample_circular_grid(55.75, 37.62, 500.0, step)
     assert len(cells) <= elev._MAX_GRID_POINTS
+
+
+def test_fetch_uses_fallback_when_opentopo_missing(monkeypatch):
+    monkeypatch.setattr(elev, "_CACHE", {})
+    monkeypatch.setattr(
+        elev,
+        "probe_elevation_api",
+        lambda force=False: {
+            "ok": True,
+            "error": None,
+            "opentopodata_ok": True,
+            "fallback_ok": True,
+        },
+    )
+
+    def fake_opentopo(batch_lat, batch_lon):
+        return [None] * len(batch_lat)
+
+    def fake_fallback(batch_lat, batch_lon):
+        return [42.0] * len(batch_lat)
+
+    monkeypatch.setattr(elev, "_fetch_opentopodata_batch", fake_opentopo)
+    monkeypatch.setattr(elev, "_fetch_fallback_batch", fake_fallback)
+
+    vals = elev.fetch_elevations_batch([55.75], [37.62])
+
+    assert vals == [42.0]
+    assert elev._last_fetch_source == "openmeteo"

server/tests/test_schema.py

@@ -45,6 +45,50 @@ def test_old_telemetry_without_meta_gets_migrated(temp_db):
     conn.close()
 
 
+def test_sync_track_offline_upload(temp_db, monkeypatch):
+    storage.init_db()
+    monkeypatch.setattr(storage, "fetch_elevation_m", lambda lat, lon: 100.0)
+
+    start = storage.start_track("android-12345678")
+    tid = start["track_id"]
+
+    result = storage.sync_track(
+        "android-12345678",
+        [
+            {"ts": 1.0, "lat": 55.75, "lon": 37.62, "role": "TX"},
+            {"ts": 2.0, "lat": 55.751, "lon": 37.621, "role": "TX"},
+        ],
+        track_id=tid,
+        finish=True,
+    )
+    assert result["added"] == 2
+    assert result["finished"] is True
+    assert result["point_count"] == 2
+
+    track = storage.get_track(tid)
+    assert len(track["points"]) == 2
+    assert track["ended_at"] is not None
+
+
+def test_sync_track_create_offline(temp_db, monkeypatch):
+    storage.init_db()
+    monkeypatch.setattr(storage, "fetch_elevation_m", lambda lat, lon: 50.0)
+
+    result = storage.sync_track(
+        "android-abcdef01",
+        [
+            {"ts": 10.0, "lat": 59.93, "lon": 30.33, "role": "RX"},
+        ],
+        track_id=None,
+        started_at=10.0,
+        finish=True,
+    )
+    assert result["track_id"] > 0
+    assert result["point_count"] == 1
+    track = storage.get_track(result["track_id"])
+    assert track["started_at"] == 10.0
+
+
 def test_tracks_crud(temp_db):
     storage.init_db()
     start = storage.start_track("android-12345678")