Now app can create connection and talk with the device

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

@@ -28,7 +28,6 @@ import kotlinx.coroutines.flow.flow
 import kotlinx.coroutines.flow.flowOn
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.onCompletion
-import kotlinx.coroutines.flow.toSet
 import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
 import java.io.IOException
@@ -147,7 +146,8 @@ class AndroidBluetoothController(private val context: Context) : BluetoothContro
     )
 
     companion object {
-        const val SERVICE_UUID = "af7cc14b-cffa-4a3d-b677-01b0ff0a93d7"
+        // SPP service UUID
+        const val SERVICE_UUID = "00001101-0000-1000-8000-00805F9B34FB"
     }
 
     init {
@@ -241,7 +241,7 @@ class AndroidBluetoothController(private val context: Context) : BluetoothContro
         if(dataTransferService == null) {
             return null
         }
-        dataTransferService?.sendMessage(message.toByteArray())
+        dataTransferService?.sendMessage("R1399\n\r".toByteArray())
         return message
     }
 

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

@@ -15,6 +15,8 @@ import kotlinx.coroutines.flow.launchIn
 import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.flow.update
+import kotlinx.coroutines.launch
+
 class BluetoothViewModel(
     private val bluetoothController: BluetoothController
 ) : ViewModel() {
@@ -130,4 +132,10 @@ class BluetoothViewModel(
     fun cancelScan() {
         bluetoothController.cancelDiscovery()
     }
+
+    fun sendMessage(message: KMessage) {
+        viewModelScope.launch {
+            bluetoothController.trySendMessage(message)
+        }
+    }
 }

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

@@ -98,6 +98,7 @@ class MainActivity : ComponentActivity() {
                 if (bluetoothState.isConnected) {
                     Toast.makeText(applicationContext, "Подключение завершено", Toast.LENGTH_LONG)
                         .show()
+                    bluetoothViewModel.sendMessage(KMessage(1u,2u,3u,false, false))
                 }
             }
 
@@ -105,7 +106,7 @@ class MainActivity : ComponentActivity() {
 
             LaunchedEffect(key1 = bluetoothState.errorMessage) {
                 bluetoothState.errorMessage?.let { message ->
-                    Toast.makeText(applicationContext, message, Toast.LENGTH_LONG).show()
+                    Toast.makeText(applicationContext, "Ошибка: $message", Toast.LENGTH_LONG).show()
                     navController.navigate("scanner")
                 }
             }