Background persistence (#505)

* persistence step 1

* fix build

* messages in the background work, notifications not yet

* app state store

* DM icon shows up

* notification launches when app is closed!

* keep ui updated

* lifecycle fixes

* extensive logging, maybe revert later

* send nickname in announcement

* quit in notification

* setting in about sheet

* fix quit bitchat

* lifecycle fixes

* power mode based on background state

* stats for both direciotns

* fix graph persistence

* better counting

* count per device

* only compute when debug sheet is open? untested

* fix read receipts

* fix read receipts fully

* fix unread badge if messages have been read in focus

* foreground promotion fix

* fix app kill in notification

* adjust to new tor

* nice

* about sheet design

app/src/main/java/com/bitchat/android/mesh/BluetoothConnectionManager.kt

@@ -149,6 +149,7 @@ class BluetoothConnectionManager(
         
         try {
             isActive = true
+            Log.d(TAG, "ConnectionManager activated (permissions and adapter OK)")
 
         // set the adapter's name to our 8-character peerID for iOS privacy, TODO: Make this configurable
         // try {
@@ -179,6 +180,7 @@ class BluetoothConnectionManager(
                         this@BluetoothConnectionManager.isActive = false
                         return@launch
                     }
+                    Log.d(TAG, "GATT Server started")
                 } else {
                     Log.i(TAG, "GATT Server disabled by debug settings; not starting")
                 }
@@ -189,6 +191,7 @@ class BluetoothConnectionManager(
                         this@BluetoothConnectionManager.isActive = false
                         return@launch
                     }
+                    Log.d(TAG, "GATT Client started")
                 } else {
                     Log.i(TAG, "GATT Client disabled by debug settings; not starting")
                 }
@@ -214,6 +217,7 @@ class BluetoothConnectionManager(
         isActive = false
         
         connectionScope.launch {
+            Log.d(TAG, "Stopping client/server and power components...")
             // Stop component managers
             clientManager.stop()
             serverManager.stop()
@@ -230,6 +234,18 @@ class BluetoothConnectionManager(
             Log.i(TAG, "All Bluetooth services stopped")
         }
     }
+
+    /**
+     * Indicates whether this instance can be safely reused for a future start.
+     * Returns false if its coroutine scope has been cancelled.
+     */
+    fun isReusable(): Boolean {
+        val active = connectionScope.isActive
+        if (!active) {
+            Log.d(TAG, "BluetoothConnectionManager isReusable=false (scope cancelled)")
+        }
+        return active
+    }
     
     /**
      * Set app background state for power optimization