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+# Agents — Traccar Client
+
+## Verify before claiming
+
+- Run `flutter analyze` before every commit — this project had 22 deprecated API violations (`.withOpacity()` → `.withValues(alpha:)`, `value` → `initialValue` on `DropdownButtonFormField`, `activeColor` → `activeThumbColor` on `Switch`)
+- Always run `flutter build apk --debug` to confirm the APK builds after any Dart or Kotlin change
+
+## Commands
+
+```bash
+flutter analyze          # lint + typecheck (run before commit)
+flutter build apk --debug  # build Android APK
+dart format .            # format all Dart files
+```
+
+## Architecture
+
+- **Flutter** Android app with a **MethodChannel** (`com.traccar.client/tracking`) bridging to native Kotlin services
+- **4 screens**: `PermissionScreen` → `MainScreen` → `SettingsScreen` / `StatusScreen`
+- **LocationBridge** (`lib/bridge/location_bridge.dart`) — the only Dart→Native bridge; all tracking starts here
+- **Native**: Kotlin services in `android/app/src/main/kotlin/com/traccar/traccar_client/`
+  - `BridgeModule.kt` — method channel handler
+  - `service/LocationTrackingService.kt` — foreground service
+  - `location/HeartbeatScheduler.kt` — AlarmManager-based heartbeat (not WorkManager — WorkManager runs in separate process and static callbacks are lost)
+
+## Key patterns & gotchas
+
+- **Permission flow**: `locationAlways` (background) requires `locationWhenInUse` to be granted first. Always request WhenInUse → then Always. Check `isPermanentlyDenied` and call `openAppSettings()` to direct user to app settings.
+- **Battery optimization**: Use `PowerManager.isIgnoringBatteryOptimizations(packageName)` via `BridgeModule` to detect if app is excluded from Doze. Open settings with `ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS` intent.
+- **Dark theme**: Set globally on `MaterialApp` (`scaffoldBackgroundColor`, `brightness: Brightness.dark`, `ColorScheme.dark`). Use `ZoomPageTransitionsBuilder` to avoid white flash on page transitions (not `FadeUpwardsPageTransitionsBuilder`).
+- **Tracking config**: Config dict must be passed to `startTracking()` and also sent via `updateConfig()` separately. Both calls are needed.
+- **`permission_screen.dart` state**: Permissions are checked at init via `_checkPermissions()`. State must be re-checked after each request call, not assumed from the request result.
+- **`preferences.dart`**: Uses static `SharedPreferences` instance. `Preferences.init()` must be called before `runApp()`.
+
+## Style conventions
+
+- Monospace fonts, dark `#0d0d0d` background, teal `#00bcd4` accent, green `#00e676` for active/granted states
+- All UI text uses `fontFamily: 'monospace'`
+- Replace `Color.withOpacity(x)` → `Color.withValues(alpha: x)` (deprecated in recent Flutter)
+- Remove unused imports before committing
+
+## Monorepo context
+
+The sibling `traccar-client-android` directory is the **original Java app** — reference it for expected server request format: POST to `serverUrl?id=deviceId&lat=...&lon=...&timestamp=...&is_moving=0`. The `is_moving` threshold is `speed > 1.0 m/s`.
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