android - Bluetooth Connection failed "java.io.IOException: read failed, socket might closed or timeout, read ret: -1"

Question

I am trying to connect devices through my app installed in Nexus 5.I want to make an app like rainbow contacts in android. In my app I aim to connect to another device through Bluetooth and transfer set of contacts or files. I followed this question, but the workaround mentioned there is not working for me Here is my full code. This is the code snippet from my application where I have tried to get the socket and make connections.

I am able to get through pairing device dialog ,but when i trying to paired then error is raised

//to create socket
if (secure) {
            bluetoothSocket = device.createRfcommSocketToServiceRecord(uuid);
        } else {
            bluetoothSocket = device.createInsecureRfcommSocketToServiceRecord(uuid);
        }
//connection establishment
try {

                bluetoothSocket.connect();
                success = true;
                break;
            } catch (IOException e) {
                //try the fallback
                try {
                    Class<?> clazz = tmp.getRemoteDevice().getClass();
                    Class<?>[] paramTypes = new Class<?>[] {Integer.TYPE};
                    Method m = clazz.getMethod("createRfcommSocket", paramTypes);
                    Object[] params = new Object[] {Integer.valueOf(1)};
                    bluetoothSocket  = (BluetoothSocket) m.invoke(tmp.getRemoteDevice(), params);
                    Thread.sleep(500);
                    bluetoothSocket.connect();
                    success = true;
                    break;
                } catch (FallbackException e1) {
                    Log.w("BT", "Could not initialize FallbackBluetoothSocket classes.", e);
                } catch (InterruptedException e1) {
                    Log.w("BT", e1.getMessage(), e1);
                } catch (IOException e1) {
                    Log.w("BT", "Fallback failed. Cancelling.", e1);
                }
            }

Error I am getting

09-06 13:44:57.247  27860-27860/com.example.gauravdubey.myapplication I/BT﹕ Attempting to connect to Protocol: 00001101-0000-1000-8000-00805f9b34fb
09-06 13:44:57.247  27860-27860/com.example.gauravdubey.myapplication W/BluetoothAdapter﹕ getBluetoothService() called with no BluetoothManagerCallback
09-06 13:44:57.247  27860-27860/com.example.gauravdubey.myapplication D/BluetoothSocket﹕ connect(), SocketState: INIT, mPfd: {ParcelFileDescriptor: FileDescriptor[56]}
09-06 13:44:58.667  27860-27860/com.example.gauravdubey.myapplication W/BluetoothAdapter﹕ getBluetoothService() called with no BluetoothManagerCallback
09-06 13:44:58.667  27860-27860/com.example.gauravdubey.myapplication D/BluetoothSocket﹕ connect(), SocketState: INIT, mPfd: {ParcelFileDescriptor: FileDescriptor[59]}
09-06 13:45:03.267  27860-27860/com.example.gauravdubey.myapplication W/BT﹕ Fallback failed. Cancelling.
    java.io.IOException: read failed, socket might closed or timeout, read ret: -1
            at android.bluetooth.BluetoothSocket.readAll(BluetoothSocket.java:505)
            at android.bluetooth.BluetoothSocket.waitSocketSignal(BluetoothSocket.java:482)
            at android.bluetooth.BluetoothSocket.connect(BluetoothSocket.java:324)
            at com.example.gauravdubey.myapplication.BluetoothConnector$FallbackBluetoothSocket.connect(BluetoothConnector.java:198)
            at com.example.gauravdubey.myapplication.BluetoothConnector.connect(BluetoothConnector.java:62)
            at com.example.gauravdubey.myapplication.ConnectThread.run(ConnectThread.java:101)
            at com.example.gauravdubey.myapplication.MainActivity$1.onItemClick(MainActivity.java:288)
            at android.widget.AdapterView.performItemClick(AdapterView.java:299)
            at android.widget.AbsListView.performItemClick(AbsListView.java:1113)
            at android.widget.AbsListView$PerformClick.run(AbsListView.java:2911)
            at android.widget.AbsListView$3.run(AbsListView.java:3645)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5001)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
            at dalvik.system.NativeStart.main(Native Method)
09-06 13:45:03.267  27860-27860/com.example.gauravdubey.myapplication V/connectThread﹕ Could not connect to device: B0:D0:9C:8B:A4:47
09-06 13:45:03.267  27860-27860/com.example.gauravdubey.myapplication I/Choreographer﹕ Skipped 361 frames!  The application may be doing too much work on its main thread.

So what i am doing wrong ? any help would be appreciated

Answer 1

In the constructor of BluetoothConnector.java, a list of uuidCandidates is passed.

public BluetoothConnector(BluetoothDevice device, boolean secure, BluetoothAdapter adapter,
                              List<UUID> uuidCandidates) 
          {
        this.device = device;
        this.secure = secure;
        this.adapter = adapter;
        this.uuidCandidates = uuidCandidates;

        if (this.uuidCandidates == null || this.uuidCandidates.isEmpty()) {
            this.uuidCandidates = new ArrayList<UUID>();
            this.uuidCandidates.add(UUID.fromString("fa87c0d0-afac-11de-8a39-0800200c9a66"));
        }
    }

Have you passed it null?

If yes,then try calling device.fetchUuidsWithSdp() for the Bluetooth device you want to connect and receive BluetoothDevice.ACTION_UUID intent in your receiver.As this will fetch a list of uuids supported for the device.