title: UUID bluetooth and android devices
body: <p>I'm trying to develop an application for Android devices that connects two devices, but the problem is that I can only connect (using Bluetooth) with PC Bluetooth or devices with another OS than Android.</p>
  
  <p>I think that the problem is the UUID, right now I'm using, in <code>BluetoothCommandService.java</code>:</p>
  
  <pre><code>private static final 
          UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb");
  </code></pre>
  
  <p>And then:<BR></p>
  
  <pre><code>    private class ConnectThread extends Thread {
      private final BluetoothSocket mmSocket;
      private final BluetoothDevice mmDevice;
  
      public ConnectThread(BluetoothDevice device) {
          mmDevice = device;
          BluetoothSocket tmp = null;
  
          // Get a BluetoothSocket for a connection with the
          // given BluetoothDevice
          try {
              tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
          } catch (IOException e) {
              Log.e(LOG_TAG, "create() failed", e);
          }
          mmSocket = tmp;
      }
  </code></pre>
  
  <p>Anyway i leave here all the code related to BluetoothCommandService.java: <BR></p>
  
  <pre><code>    package com.example.vista;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.util.UUID;
  
  import android.bluetooth.BluetoothAdapter;
  import android.bluetooth.BluetoothDevice;
  import android.bluetooth.BluetoothSocket;
  import android.content.Context;
  import android.os.Bundle;
  import android.os.Handler;
  import android.os.Message;
  import android.telephony.TelephonyManager;
  import android.util.Log;
  
  public class BluetoothCommandService {
      // Debugging
      private static final String LOG_TAG = "BluetoothCommandService";
      private static final boolean DEBUG = true;
  
      // Unique UUID for this application
      private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb");
  
      /*TelephonyManager tManager = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
      String uuid = tManager.getDeviceId();*/
  
  
      // Member fields
      private final BluetoothAdapter mAdapter;
      private final Handler mHandler;
      private ConnectThread mConnectThread;
      private ConnectedThread mConnectedThread;
      private int mState;
  //    private BluetoothDevice mSavedDevice;
  //    private int mConnectionLostCount;
  
      // Constants that indicate the current connection state
      public static final int STATE_NONE = 0;       // we're doing nothing
      public static final int STATE_LISTEN = 1;     // now listening for incoming connections
      public static final int STATE_CONNECTING = 2; // now initiating an outgoing connection
      public static final int STATE_CONNECTED = 3;  // now connected to a remote device
  
      // Constants that indicate command to computer
      public static final int EXIT_CMD = -1;
      public static final int VOL_UP = 1;
      public static final int VOL_DOWN = 2;
      public static final int MOUSE_MOVE = 3;
  
      /**
       * Constructor. Prepares a new BluetoothChat session.
       * @param context  The UI Activity Context
       * @param handler  A Handler to send messages back to the UI Activity
       */
      public BluetoothCommandService(Context context, Handler handler) {
          if (DEBUG) Log.e(LOG_TAG, "BluetoothCommandService");
          mAdapter = BluetoothAdapter.getDefaultAdapter();
          mState = STATE_NONE;
          //mConnectionLostCount = 0;
          mHandler = handler;
      }
  
      /**
       * Set the current state of the chat connection
       * @param state  An integer defining the current connection state
       */
      private synchronized void setState(int state) {
          if (DEBUG) Log.e(LOG_TAG, "setState() " + mState + " -&gt; " + state);
          mState = state;
  
          // Give the new state to the Handler so the UI Activity can update
          mHandler.obtainMessage(Buscarpartida.MESSAGE_STATE_CHANGE, state, -1).sendToTarget();
      }
  
      /**
       * Return the current connection state. */
      public synchronized int getState() {
          Log.e(LOG_TAG, "MSTATE "+ mState);
          return mState;
      }
  
      /**
       * Start the chat service. Specifically start AcceptThread to begin a
       * session in listening (server) mode. Called by the Activity onResume() */
      public synchronized void start() {
          if (DEBUG) Log.e(LOG_TAG, "start");
  
          // Cancel any thread attempting to make a connection
          if (mConnectThread != null) {mConnectThread.cancel(); mConnectThread = null;}
  
          // Cancel any thread currently running a connection
          if (mConnectedThread != null) {mConnectedThread.cancel(); mConnectedThread = null;}
  
  
          setState(STATE_NONE);
          Log.e(LOG_TAG, "start fin "+ mState);
      }
  
      /**
       * Start the ConnectThread to initiate a connection to a remote device.
       * @param device  The BluetoothDevice to connect
       */
      public synchronized void connect(BluetoothDevice device) {
          if (DEBUG) Log.e(LOG_TAG, "connect to: " + device);
  
          // Cancel any thread attempting to make a connection
          if (mState == STATE_CONNECTING) {
              if (mConnectThread != null) {mConnectThread.cancel(); mConnectThread = null;}
          }
  
          // Cancel any thread currently running a connection
          if (mConnectedThread != null) {mConnectedThread.cancel(); mConnectedThread = null;}
  
          // Start the thread to connect with the given device
          mConnectThread = new ConnectThread(device);
          mConnectThread.start();
  
          setState(STATE_CONNECTING);
      }
  
      /**
       * Start the ConnectedThread to begin managing a Bluetooth connection
       * @param socket  The BluetoothSocket on which the connection was made
       * @param device  The BluetoothDevice that has been connected
       */
      public synchronized void connected(BluetoothSocket socket, BluetoothDevice device) {
          // Cancel the thread that completed the connection
          if (mConnectThread != null) {mConnectThread.cancel(); mConnectThread = null;}
  
          // Cancel any thread currently running a connection
          if (mConnectedThread != null) {mConnectedThread.cancel(); mConnectedThread = null;}
  
          // Start the thread to manage the connection and perform transmissions
          mConnectedThread = new ConnectedThread(socket);
          mConnectedThread.start();
  
          // Send the name of the connected device back to the UI Activity
          Message msg = mHandler.obtainMessage(Buscarpartida.MESSAGE_DEVICE_NAME);
          Bundle bundle = new Bundle();
          bundle.putString(Buscarpartida.DEVICE_NAME, device.getName());
          msg.setData(bundle);
          mHandler.sendMessage(msg);
  
  
  
          setState(STATE_CONNECTED);
      }
  
      /**
       * Stop all threads
       */
      public synchronized void stop() {
          if (DEBUG) Log.e(LOG_TAG, "stop");
          if (mConnectThread != null) {mConnectThread.cancel(); mConnectThread = null;}
          if (mConnectedThread != null) {mConnectedThread.cancel(); mConnectedThread = null;}
  
          setState(STATE_NONE);
          if (DEBUG) Log.e(LOG_TAG, "stop fin "+ mState);
      }
  
      /**
       * Write to the ConnectedThread in an unsynchronized manner
       * @param out The bytes to write
       * @see ConnectedThread#write(byte[])
       */
      public void write(byte[] out) {
          // Create temporary object
          ConnectedThread r;
          // Synchronize a copy of the ConnectedThread
          synchronized (this) {
              if (mState != STATE_CONNECTED) return;
              r = mConnectedThread;
          }
          // Perform the write unsynchronized
          r.write(out);
      }
  
      public void write(int out) {
          // Create temporary object
          ConnectedThread r;
          // Synchronize a copy of the ConnectedThread
          synchronized (this) {
              if (mState != STATE_CONNECTED) return;
              r = mConnectedThread;
          }
          // Perform the write unsynchronized
          r.write(out);
      }
  
      /**
       * Indicate that the connection attempt failed and notify the UI Activity.
       */
      private void connectionFailed() {
          setState(STATE_LISTEN);
  
          // Send a failure message back to the Activity
          Message msg = mHandler.obtainMessage(Buscarpartida.MESSAGE_TOAST);
          Bundle bundle = new Bundle();
          bundle.putString(Buscarpartida.TOAST, "Imposible Conectar");
          msg.setData(bundle);
          mHandler.sendMessage(msg);
      }
  
      /**
       * Indicate that the connection was lost and notify the UI Activity.
       */
      private void connectionLost() {
  //        mConnectionLostCount++;
  //        if (mConnectionLostCount &lt; 3) {
  //          // Send a reconnect message back to the Activity
  //          Message msg = mHandler.obtainMessage(Main.MESSAGE_TOAST);
  //          Bundle bundle = new Bundle();
  //          bundle.putString(Main.TOAST, "Device connection was lost. Reconnecting...");
  //          msg.setData(bundle);
  //          mHandler.sendMessage(msg);
  //          
  //          connect(mSavedDevice);      
  //        } else {
              setState(STATE_LISTEN);
              // Send a failure message back to the Activity
              Message msg = mHandler.obtainMessage(Buscarpartida.MESSAGE_TOAST);
              Bundle bundle = new Bundle();
              bundle.putString(Buscarpartida.TOAST, "Conexion Perdida");
              msg.setData(bundle);
              mHandler.sendMessage(msg);
  //        }
      }
  
      /**
       * This thread runs while attempting to make an outgoing connection
       * with a device. It runs straight through; the connection either
       * succeeds or fails.
       */
      private class ConnectThread extends Thread {
          private final BluetoothSocket mmSocket;
          private final BluetoothDevice mmDevice;
  
          public ConnectThread(BluetoothDevice device) {
              mmDevice = device;
              BluetoothSocket tmp = null;
  
              // Get a BluetoothSocket for a connection with the
              // given BluetoothDevice
              try {
                  tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
              } catch (IOException e) {
                  Log.e(LOG_TAG, "create() failed", e);
              }
              mmSocket = tmp;
          }
  
          public void run() {
              setName("ConnectThread");
  
              // Always cancel discovery because it will slow down a connection
              mAdapter.cancelDiscovery();
              Log.e(LOG_TAG, "cancelDiscovery()");
              // Make a connection to the BluetoothSocket
              try {
                  // This is a blocking call and will only return on a
                  // successful connection or an exception
  
                  mmSocket.connect();
                  Log.e(LOG_TAG, "mmSocket.connect()");
  
              } catch (IOException e) {
                  connectionFailed();
                  Log.e(LOG_TAG, " connectionFailed()");
                  // Close the socket
                  try {
                      mmSocket.close();
                  } catch (IOException e2) {
                      Log.e(LOG_TAG, "unable to close() socket during connection failure", e2);
                  }
                  // Start the service over to restart listening mode
                  Log.e(LOG_TAG, "run2()");
                  BluetoothCommandService.this.start();
  
                  return;
              }
  
              // Reset the ConnectThread because we're done
              synchronized (BluetoothCommandService.this) {
                  mConnectThread = null;
              }
  
              // Start the connected thread
              connected(mmSocket, mmDevice);
          }
  
          public void cancel() {
              try {
                  mmSocket.close();
              } catch (IOException e) {
                  Log.e(LOG_TAG, "close() of connect socket failed", e);
              }
          }
      }
  
      /**
       * This thread runs during a connection with a remote device.
       * It handles all incoming and outgoing transmissions.
       */
      private class ConnectedThread extends Thread {
          private final BluetoothSocket mmSocket;
          private final InputStream mmInStream;
          private final OutputStream mmOutStream;
  
          public ConnectedThread(BluetoothSocket socket) {
              Log.e(LOG_TAG, "create ConnectedThread");
              mmSocket = socket;
              InputStream tmpIn = null;
              OutputStream tmpOut = null;
  
              // Get the BluetoothSocket input and output streams
              try {
                  tmpIn = socket.getInputStream();
                  tmpOut = socket.getOutputStream();
              } catch (IOException e) {
                  Log.e(LOG_TAG, "temp sockets not created", e);
              }
  
              mmInStream = tmpIn;
              mmOutStream = tmpOut;
          }
  
          public void run() {
              Log.e(LOG_TAG, "runrer");
              byte[] buffer = new byte[1024];
  
              // Keep listening to the InputStream while connected
              while (true) {
                  try {
                      // Read from the InputStream
                      int bytes = mmInStream.read(buffer);
  
                      // Send the obtained bytes to the UI Activity
                      mHandler.obtainMessage(Buscarpartida.MESSAGE_READ, bytes, -1, buffer)
                              .sendToTarget();
                  } catch (IOException e) {
                      Log.e(LOG_TAG, "disconnected", e);
                      connectionLost();
                      break;
                  }
              }
          }
  
  
          /**
           * Write to the connected OutStream.
           * @param buffer  The bytes to write
           */
          public void write(byte[] buffer) {
              try {
                  mmOutStream.write(buffer);
  
                  // Share the sent message back to the UI Activity
  //                mHandler.obtainMessage(BluetoothChat.MESSAGE_WRITE, -1, -1, buffer)
  //                        .sendToTarget();
              } catch (IOException e) {
                  Log.e(LOG_TAG, "Exception during write", e);
              }
          }
  
          public void write(int out) {
              try {
                  mmOutStream.write(out);
  
                  // Share the sent message back to the UI Activity
  //                mHandler.obtainMessage(BluetoothChat.MESSAGE_WRITE, -1, -1, buffer)
  //                        .sendToTarget();
              } catch (IOException e) {
                  Log.e(LOG_TAG, "Exception during write", e);
              }
          }
  
          public void cancel() {
              try {
                  mmOutStream.write(EXIT_CMD);
                  mmSocket.close();
              } catch (IOException e) {
                  Log.e(LOG_TAG, "close() of connect socket failed", e);
              }
          }
      }
  }
  </code></pre>
  
  <p>Thank you very much!</p>