feat: add SOS Emergency feature with sender/receiver integration, audio recording, and boot resilience

app/build.gradle.kts

@@ -258,13 +258,14 @@ android {
                 val total = project.findProperty("testShardTotal")?.toString()?.toIntOrNull()
                 if (shard != null && total != null && total > 1) {
                     val testSourceDir = project.file("src/test/java")
-                    val allTestClasses = project.fileTree(testSourceDir) {
-                        include("**/*Test.kt")
-                    }.files.map { f ->
-                        f.relativeTo(testSourceDir)
-                            .path.replace(File.separatorChar, '.')
-                            .removeSuffix(".kt")
-                    }.sorted()
+                    val allTestClasses =
+                        project.fileTree(testSourceDir) {
+                            include("**/*Test.kt")
+                        }.files.map { f ->
+                            f.relativeTo(testSourceDir)
+                                .path.replace(File.separatorChar, '.')
+                                .removeSuffix(".kt")
+                        }.sorted()
                     val shardClasses = allTestClasses.filterIndexed { i, _ -> i % total == shard }
                     shardClasses.forEach { cls -> it.filter.includeTestsMatching(cls) }
                 }

app/src/main/AndroidManifest.xml

@@ -50,6 +50,7 @@
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_DATA_SYNC" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_CONNECTED_DEVICE" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_SPECIAL_USE" />
 
     <!-- Notification permission (Android 13+) -->
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
@@ -68,12 +69,16 @@
     <uses-permission android:name="android.permission.RECORD_AUDIO" />
     <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
     <uses-permission android:name="android.permission.USE_FULL_SCREEN_INTENT" />
+    <!-- Covers both ReticulumService and SosTriggerService (app-wide, not per-service) -->
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_MICROPHONE" />
     <!-- Required to show incoming call screen over other apps when phone is unlocked -->
     <!-- and app is closed (Android 10+ background activity launch restriction) -->
     <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
     <uses-feature android:name="android.hardware.microphone" android:required="false" />
 
+    <!-- Auto-start after device boot -->
+    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
+
     <!-- Companion Device Manager (Android 12+) for RNode association -->
     <uses-feature android:name="android.software.companion_device_setup" android:required="false" />
     <uses-permission android:name="android.permission.REQUEST_COMPANION_RUN_IN_BACKGROUND" />
@@ -157,6 +162,19 @@
                 android:resource="@xml/usb_device_filter" />
         </activity>
 
+        <!-- SOS Trigger Detection Service -->
+        <!-- Foreground service that keeps the process alive for accelerometer-based -->
+        <!-- SOS gesture detection (shake/tap) when the app is in the background -->
+        <service
+            android:name=".service.SosTriggerService"
+            android:enabled="true"
+            android:exported="false"
+            android:foregroundServiceType="specialUse|microphone">
+            <property
+                android:name="android.app.PROPERTY_SPECIAL_USE_FGS_SUBTYPE"
+                android:value="Emergency SOS gesture detection via accelerometer" />
+        </service>
+
         <!-- Reticulum Background Service -->
         <!-- Runs in separate process to allow clean restarts when applying config changes -->
         <!-- BLE functionality is now integrated via KotlinBLEBridge (no separate service needed) -->
@@ -180,6 +198,16 @@
             </intent-filter>
         </service>
 
+        <!-- Auto-start services after device boot -->
+        <receiver
+            android:name=".receiver.BootReceiver"
+            android:enabled="true"
+            android:exported="false">
+            <intent-filter>
+                <action android:name="android.intent.action.BOOT_COMPLETED" />
+            </intent-filter>
+        </receiver>
+
         <!-- FileProvider for sharing identity files -->
         <provider
             android:name="androidx.core.content.FileProvider"

app/src/main/aidl/com/lxmf/messenger/IReticulumService.aidl

@@ -409,7 +409,7 @@ interface IReticulumService {
      * @param iconBgColor Optional icon background color hex string (3 bytes RGB, e.g., "1E88E5")
      * @return JSON string with result: {"success": true, "message_hash": "...", "delivery_method": "..."}
      */
-    String sendLxmfMessageWithMethod(in byte[] destHash, String content, in byte[] sourceIdentityPrivateKey, String deliveryMethod, boolean tryPropagationOnFail, in byte[] imageData, String imageFormat, String imageDataPath, in Map fileAttachments, in Map fileAttachmentPaths, String replyToMessageId, String iconName, String iconFgColor, String iconBgColor);
+    String sendLxmfMessageWithMethod(in byte[] destHash, String content, in byte[] sourceIdentityPrivateKey, String deliveryMethod, boolean tryPropagationOnFail, in byte[] imageData, String imageFormat, String imageDataPath, in Map fileAttachments, in Map fileAttachmentPaths, String replyToMessageId, String iconName, String iconFgColor, String iconBgColor, String telemetryJson, in byte[] audioData, String audioDataPath, String sosState);
 
     /**
      * Provide an alternative relay for message retry.

app/src/main/java/com/lxmf/messenger/ColumbaApplication.kt

@@ -14,6 +14,9 @@ import com.lxmf.messenger.reticulum.protocol.ServiceReticulumProtocol
 import com.lxmf.messenger.service.IdentityResolutionManager
 import com.lxmf.messenger.service.MessageCollector
 import com.lxmf.messenger.service.PropagationNodeManager
+import com.lxmf.messenger.service.SosActiveTracker
+import com.lxmf.messenger.service.SosManager
+import com.lxmf.messenger.service.SosTriggerDetector
 import com.lxmf.messenger.service.TelemetryCollectorManager
 import com.lxmf.messenger.startup.ConfigApplyFlagManager
 import com.lxmf.messenger.startup.ServiceIdentityVerifier
@@ -88,6 +91,15 @@ class ColumbaApplication : Application() {
     @Inject
     lateinit var telemetryCollectorManager: TelemetryCollectorManager
 
+    @Inject
+    lateinit var sosManager: SosManager
+
+    @Inject
+    lateinit var sosTriggerDetector: SosTriggerDetector
+
+    @Inject
+    lateinit var receivedLocationDao: com.lxmf.messenger.data.db.dao.ReceivedLocationDao
+
     // Application-level coroutine scope for app-wide operations
     // Uses Dispatchers.Default for background initialization (no main-thread work needed)
     // SupervisorJob ensures failures don't crash the entire app
@@ -137,6 +149,26 @@ class ColumbaApplication : Application() {
 
         android.util.Log.d("ColumbaApplication", "Main app process detected ($processName) - proceeding with auto-initialization")
 
+        // Start SOS trigger detector (observes settings, starts/stops accelerometer listener)
+        sosTriggerDetector.startObserving()
+        // Restore SOS active state if app was restarted while SOS was active
+        sosManager.restoreIfActive()
+        // Restore SOS active tracker from recent trail data (receiver side)
+        applicationScope.launch {
+            try {
+                val recentSenders =
+                    receivedLocationDao.getRecentSosTrailSenders(
+                        sinceTimestamp = System.currentTimeMillis() - 24 * 3600_000L,
+                    )
+                if (recentSenders.isNotEmpty()) {
+                    SosActiveTracker.restoreFromSenders(recentSenders.toSet())
+                    android.util.Log.d("ColumbaApplication", "Restored ${recentSenders.size} SOS active senders")
+                }
+            } catch (e: Exception) {
+                android.util.Log.w("ColumbaApplication", "Failed to restore SOS active senders", e)
+            }
+        }
+
         // Preload theme preference into DataStore's in-memory cache
         // This eliminates theme flash on app startup by ensuring the theme is cached
         // before MainActivity renders. Combined with SplashScreen API for zero-flash UX.

app/src/main/java/com/lxmf/messenger/IncomingCallActivity.kt

@@ -76,6 +76,15 @@ class IncomingCallActivity : ComponentActivity() {
             return
         }
 
+        // SOS silent auto-answer: if SOS is active and setting is enabled, answer immediately
+        val app = applicationContext as? ColumbaApplication
+        if (app?.sosManager?.shouldAutoAnswer() == true) {
+            Log.i(TAG, "SOS silent auto-answer: answering call automatically")
+            answerCall()
+            currentIdentityHash.value?.let { navigateToActiveCall(it) }
+            return
+        }
+
         // Show over lock screen and turn screen on
         configureWindowForIncomingCall()