android: reduce battery usage by not using permanent wakelock (#6176)

* android, desktop: core API event timeout setting

* chat_recv_msg_wait with STM timeout

* Revert "chat_recv_msg_wait with STM timeout"

This reverts commit fdfa2964c5.

* do not use permanent wake lock

* wakelock option, get wakelock on network information change

* remove option

apps/multiplatform/android/src/main/java/chat/simplex/app/SimplexApp.kt

@@ -46,6 +46,7 @@ class SimplexApp: Application(), LifecycleEventObserver {
 
   override fun onCreate() {
     super.onCreate()
+    AppContextProvider.initialize(this)
     if (ProcessPhoenix.isPhoenixProcess(this)) {
       return
     } else {

apps/multiplatform/android/src/main/java/chat/simplex/app/SimplexService.kt

@@ -144,11 +144,18 @@ class SimplexService: Service() {
           return@withLongRunningApi
         }
         saveServiceState(self, ServiceState.STARTED)
-        wakeLock = (getSystemService(Context.POWER_SERVICE) as PowerManager).run {
-          newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, WAKE_LOCK_TAG).apply {
-            acquire()
-          }
-        }
+// Permanent wakelock prevents deep sleep and results in high battery usage.
+// Instead, the app relies on being whitelisted for unrestricted battery usage,
+// and also takes wakelock on network events and on network information changes, which allows it to reconnect.
+// Network events and information changes are delivered even when device is in deep sleep.
+// Possibly, we may need to additionally use "alarms" to wake the app periodically,
+// but in all pre-release tests the app was reliably delivering messages in deep sleep, even restored dropped connections.
+//
+//        wakeLock = (getSystemService(Context.POWER_SERVICE) as PowerManager).run {
+//          newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, WAKE_LOCK_TAG).apply {
+//            acquire()
+//          }
+//        }
       } finally {
         isCheckingNewMessages = false
       }
@@ -167,7 +174,7 @@ class SimplexService: Service() {
     }
     return null
   }
-  
+
   private fun createServiceNotification(title: String, text: String): Notification {
     val pendingIntent: PendingIntent = Intent(this, MainActivity::class.java).let { notificationIntent ->
       PendingIntent.getActivity(this, 0, notificationIntent, PendingIntent.FLAG_IMMUTABLE)