Autodisconnect from device, when the flight screen remove from the backstack

app/src/main/java/com/helible/pilot/BluetoothController.kt

@@ -241,7 +241,7 @@ class AndroidBluetoothController(private val context: Context) : BluetoothContro
         if(dataTransferService == null) {
             return null
         }
-        dataTransferService?.sendMessage("R1399\n\r".toByteArray())
+        dataTransferService?.sendMessage("R1250\n\r".toByteArray())
         return message
     }
 

app/src/main/java/com/helible/pilot/BluetoothViewModel.kt

@@ -1,6 +1,5 @@
 package com.helible.pilot
 
-import android.bluetooth.BluetoothDevice
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import kotlinx.coroutines.Job
@@ -84,7 +83,7 @@ class BluetoothViewModel(
                 }
             }
         }
-            .catch { throwable ->
+            .catch { _ ->
                 bluetoothController.closeConnection()
                 _state.update {
                     it.copy(

app/src/main/java/com/helible/pilot/MainActivity.kt

@@ -8,6 +8,7 @@ import android.os.Bundle
 import android.util.Log
 import android.widget.Toast
 import androidx.activity.ComponentActivity
+import androidx.activity.compose.BackHandler
 import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.compose.setContent
 import androidx.activity.result.contract.ActivityResultContracts
@@ -162,6 +163,11 @@ class MainActivity : ComponentActivity() {
                                     bluetoothViewModel.connectToDevice(device)
                                 }
                             }
+                            BackHandler {
+                                bluetoothViewModel.disconnectFromDevice()
+                                Log.i("FlightScreen", "Disconnected from device")
+                                navController.navigate("scanner")
+                            }
                             when {
                                 bluetoothState.isConnecting -> {
                                     Column(