******************************************************************************
    MAIN ACTIVITY FILE
    ******************************************************************************

    package com.djag.tcpclitest2;

    imports...

    public class MainActivity extends Activity {

    EditText edittext_Host;
    EditText edittext_Port;
    Button button_Connect;
    Button button_Stop;

    @Override
    protected void onCreate(Bundle savedInstanceState)
            {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);

            edittext_Host = (EditText)findViewById(R.id.editText_Host);
            edittext_Port = (EditText)findViewById(R.id.editText_Port);
            button_Connect = (Button)findViewById(R.id.button_Connect);
            button_Stop = (Button)findViewById(R.id.button_Stop);

            if (receiver != null) registerReceiver(receiver, new IntentFilter(NOTIFICATIONMAIN));

            button_Connect.setOnClickListener(new View.OnClickListener()
                    {
                    @Override
                    public void onClick(View view)
                            {
                            StartControlService();
                            }
                    });

            button_Stop.setOnClickListener(new View.OnClickListener()
                    {
                    @Override
                    public void onClick(View view)
                            {
                            StopControlService();
                            }
                    });

            }

    @Override
    protected void onDestroy()
            {
            super.onDestroy();

            if (receiver != null) unregisterReceiver(receiver);
            }

    // Start control service
    public void StartControlService()
            {
            Intent intent = new Intent(this, ControlService.class);
            //intent.putExtra(ControlService.HOST, edittext_Host.getText().toString());
            //intent.putExtra(ControlService.PORT, edittext_Port.getText().toString());
            startService(intent);
            }

    // Request to stop control service
    public void StopControlService()
            {
            Intent ComIntent = new Intent(NOTIFICATIONSERVICE);
            ComIntent.putExtra(CONTROL, REQUESTCLOSE);
            ComIntent.putExtra(DATA, "");
            sendBroadcast(ComIntent);
            }

    private BroadcastReceiver receiver = new BroadcastReceiver()
            {
            @Override
            public void onReceive(Context context, Intent intent)
                    {
                    Bundle bundle = intent.getExtras();
                    if (bundle != null)
                            {
                            TextView textView_Status = (TextView) findViewById(R.id.textView_Status);
                            int Control = bundle.getInt(CONTROL);
                            String Data = bundle.getString(DATA);
                            switch (Control)
                                    {
                                    case NOTIFYCONNECTING: ...
                                    case NOTIFYCONNECTED: ...
                                    case NOTIFYCANTCONNECT: ...
                                    case NOTIFYDISCONNECTED: ...
                                    case NOTIFYDATARECEIVED: ...
                                    case RESPONSESTATUS: ...
                                    case RESPONSEINFO: ...
                                    case LOG: ...
                                    }
                            }
                    }
            };
    }


    ******************************************************************************
    SERVICE FILE
    ******************************************************************************

    package com.djag.tcpclitest2;

    imports...

    public class ControlService extends Service implements Runnable
    {
    private volatile boolean Terminate = false;

    private static final int SERVICE_NOTIFICATION_ID = 1000;

    @Override
    public IBinder onBind(Intent intent)
            {
            return null;
            }

    @Override
    public void onCreate()
            {
            // Start foreground
            final Intent intent = new Intent(this, ControlService.class);
            intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
            NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
            builder.setTicker(getString(R.string.app_name));
            builder.setContentTitle(getString(R.string.app_name));
            builder.setContentText(getString(R.string.app_name));
            builder.setSmallIcon(R.drawable.notification_icon);
            builder.setContentIntent(PendingIntent.getActivity(this, 0, intent, 0));
            builder.setContentIntent(PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT));
            Notification notification = builder.build();
            startForeground(SERVICE_NOTIFICATION_ID, notification);

            }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId)
            {
            Thread t = new Thread(this);
            t.start();

            return START_REDELIVER_INTENT;
            }

    @Override
    public void onDestroy()
            {

            }

    @Override
    public void run()
            {
            if (receiver != null) registerReceiver(receiver, new IntentFilter(NOTIFICATIONSERVICE));

            while (!Thread.currentThread().isInterrupted() && !Terminate)
                    {
                    synchronized (this) // not necessary
                            {

                            // Here only TCP communications
                            // Broadcast messages to the main activity using NotifyMsg

                            try { Thread.sleep(50); } catch (Exception e) { }
                            }
                    }

            if (receiver != null) unregisterReceiver(receiver);

            stopSelf();
            }

    public void NotifyMsg(int Cmd, String Dat)
            {
            Intent ComIntent = new Intent(NOTIFICATIONMAIN);
            ComIntent.putExtra(CONTROL, Cmd);
            ComIntent.putExtra(DATA, Dat);
            sendBroadcast(ComIntent);
            }

    // Receive broadcast messages from the main activity
    private BroadcastReceiver receiver = new BroadcastReceiver()
            {
            @Override
            public void onReceive(Context context, Intent intent)
                    {
                    Bundle bundle = intent.getExtras();
                    if (bundle != null)
                            {
                            int Control = bundle.getInt(CONTROL);
                            String Data = bundle.getString(DATA);
                            switch (Control)
                                    {
                                    ...
                                    ...
                                    case REQUESTCLOSE:
                                            Terminate = true;
                                            break;
                                    }
                            }
                    }
            };
    }