Better UI layout on the device screen

app/src/main/java/com/helible/pilot/viewmodels/BluetoothDataTransferService.kt

@@ -0,0 +1,51 @@
+package com.helible.pilot.viewmodels
+
+import android.bluetooth.BluetoothSocket
+import android.util.Log
+import com.helible.pilot.KMessage
+import com.helible.pilot.toKMessage
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.flow
+import kotlinx.coroutines.flow.flowOn
+import kotlinx.coroutines.withContext
+
+import java.io.IOException
+
+class TransferFailedException : IOException("Reading incoming data failed")
+
+class BluetoothDataTransferService(
+    private val socket: BluetoothSocket,
+) {
+    fun listenForIncomingMessages(): Flow<String> {
+        return flow {
+            if (!socket.isConnected)
+                return@flow
+            val buffer = ByteArray(128)
+            while (true) {
+                val byteCount: Int = try {
+                    socket.inputStream.read(buffer)
+                } catch (e: IOException) {
+                    throw TransferFailedException()
+                }
+                val strData: String = buffer.decodeToString(endIndex = byteCount)
+                emit(
+                    strData
+                )
+                Log.i("BluetoothController", "Received: ${strData.dropLast(2)}")
+            }
+        }.flowOn(Dispatchers.IO)
+    }
+
+    suspend fun sendMessage(bytes: ByteArray): Boolean {
+        return withContext(Dispatchers.IO) {
+            try {
+                socket.outputStream.write(bytes)
+            } catch (e: IOException) {
+                e.printStackTrace()
+                return@withContext false
+            }
+            true
+        }
+    }
+}