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POAndroid bluetooth in a service stops sending data after 561K
 

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  1. POAndroid bluetooth in a service stops sending data after 561K
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    <p>I wrote a service to send sensor data over bluetooth on android. Although I got no errors my C# client stops getting data after I sent exactly 561K data. At this moment it seems like my android continues to send data but my client doesn't get any. After a while, android also stops sending data. I tried different configurations. My program always stops sending data after "Service->Server". I don't get any errors but it stops sending. Here is android program.</p> <pre><code>@Override public synchronized int onStartCommand(Intent intent, int flags, int startId) { Log.i(EXTRA_MESSAGE,"onStartCommand"); if(isRunning) Log.e(EXTRA_MESSAGE, "I am already running"); else { isRunning = true; BluetoothDevice selectedDevice = (BluetoothDevice) intent.getParcelableExtra(EXTRA_MESSAGE); if(selectedDevice == null) {Log.i(EXTRA_MESSAGE,"null it is "); return -1;} connect = new ConnectThread(selectedDevice); connect.start(); mHandler =new Handler(){ @Override public void handleMessage(Message msg) { super.handleMessage(msg); switch(msg.what){ case SUCCESS_CONNECT: connected = new ConnectedThread((BluetoothSocket) msg.obj); Toast.makeText(getApplicationContext(), "Connected", 0).show(); //connected.write(("Connected").getBytes()); Log.i(EXTRA_MESSAGE, "we are connected"); isConnected = true; break; case MESSAGE_READ: Toast.makeText(getApplicationContext(), ((byte[]) msg.obj).toString(), 0).show(); break; } } }; mSensor = (SensorManager) getSystemService(SENSOR_SERVICE); sSensor = mSensor.getDefaultSensor(Sensor.TYPE_ORIENTATION); mSensor.registerListener(this, sSensor,SensorManager.SENSOR_DELAY_NORMAL); // sSensor = mSensor.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); // mSensor.registerListener(this, sSensor,SensorManager.SENSOR_DELAY_NORMAL); sSensor = mSensor.getDefaultSensor(Sensor.TYPE_GYROSCOPE); mSensor.registerListener(this, sSensor,SensorManager.SENSOR_DELAY_NORMAL); } return super.onStartCommand(intent, flags, startId); } @Override @Override public void onSensorChanged(SensorEvent event) { Log.i(EXTRA_MESSAGE, "Sensor data arrived"); if(isConnected ) { String toSend = Integer.toString(event.sensor.getType())+ ":" + Long.toString(event.timestamp)+ ":"; for(float f : event.values){ toSend = toSend + Float.toString(f)+":"; } // connected.write(toSend.getBytes()); } } private class ConnectThread extends Thread { private final BluetoothSocket mmSocket; private final BluetoothDevice mmDevice; public ConnectThread(BluetoothDevice device) { // Use a temporary object that is later assigned to mmSocket, // because mmSocket is final BluetoothSocket tmp = null; mmDevice = device; // Get a BluetoothSocket to connect with the given BluetoothDevice try { // MY_UUID is the app's UUID string, also used by the server code tmp = device.createRfcommSocketToServiceRecord(MY_UUID); Log.i(EXTRA_MESSAGE,"connectThread started successfully"); } catch (IOException e) { } mmSocket = tmp; } public void run() { // Cancel discovery because it will slow down the connection try { // Connect the device through the socket. This will block // until it succeeds or throws an exception mmSocket.connect(); Log.i(EXTRA_MESSAGE,"connectThread connect successfully"); } catch (IOException connectException) { // Unable to connect; close the socket and get out Log.i(EXTRA_MESSAGE,"connectThread connect exception"); try { mmSocket.close(); } catch (IOException closeException) { } } // Do work to manage the connection (in a separate thread) mHandler.obtainMessage(SUCCESS_CONNECT, mmSocket).sendToTarget(); } /** Will cancel an in-progress connection, and close the socket */ public void cancel() { try { mmSocket.close(); } catch (IOException e) { } } } private class ConnectedThread extends Thread { private final BluetoothSocket mmSocket; private final InputStream mmInStream; private final OutputStream mmOutStream; public boolean shouldContinue = true; int nBytes =0; public ConnectedThread(BluetoothSocket socket) { mmSocket = socket; InputStream tmpIn = null; OutputStream tmpOut = null; // Get the input and output streams, using temp objects because // member streams are final try { tmpIn = socket.getInputStream(); tmpOut = socket.getOutputStream(); Log.i(EXTRA_MESSAGE,"connectedThread sockets"); } catch (IOException e) { } mmInStream = tmpIn; mmOutStream = tmpOut; } public void run() { byte[] buffer; // buffer store for the stream int bytes; // bytes returned from read() // Keep listening to the InputStream until an exception occurs while(shouldContinue) { try { // Read from the InputStream buffer = new byte[1024]; bytes = mmInStream.read(buffer); // Send the obtained bytes to the UI activity Log.e(EXTRA_MESSAGE, " We read"); mHandler.obtainMessage(MESSAGE_READ, bytes, -1, buffer) .sendToTarget(); } catch (IOException e) { break; } } } /* Call this from the main activity to send data to the remote device */ public void write(byte[] bytes) { try { Log.i(EXTRA_MESSAGE,"Service-&gt;Server"); mmOutStream.write(bytes); nBytes += bytes.length; Log.i(EXTRA_MESSAGE,"ok" + String.valueOf(nBytes )); } catch (IOException e) { Log.i(EXTRA_MESSAGE,"exception"); } } /* Call this from the main activity to shutdown the connection */ public void cancel() { try { shouldContinue = false; mmSocket.close(); } catch (IOException e) { } } } </code></pre> <p>Also my c# thread is as follows</p> <pre><code> public void ServerConnectThread() { serverStarted = true; int counter = 0; updateUI("Server started, waiting for clients"); BluetoothListener blueListener = new BluetoothListener(mUUID); blueListener.Start(); BluetoothClient conn = blueListener.AcceptBluetoothClient(); updateUI("Client has connected"); Stream mStream = conn.GetStream(); while (true) { try { //handle server connection byte[] received = new byte[1024]; mStream.Read(received, 0, received.Length); counter += Encoding.ASCII.GetString(received).Length; String[] fields = Encoding.ASCII.GetString(received).Split(':'); double[] data = new double[3]; for (int i = 2; i &lt; 5; i++) data[i-2] = double.Parse(fields[i]); //mSource.notifyObserver(Int16.Parse(fields[0]), data); updateUI(counter.ToString() + " "+ fields[2]+ ":" + fields[3] + ":" + fields[4]); byte[] sent = Encoding.ASCII.GetBytes("Hello World"); mStream.Write(sent, 0, sent.Length); } catch (IOException exception)`enter code here` { updateUI("Client has disconnected!!!!"); } } } </code></pre> <p>One final thing is I've found thousands of 561K android program which sounded a little interesting.</p>
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