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 throu

Answer 1

Within the try ("//try the fallback") use this:

socket =(BluetoothSocket) device.getClass().getMethod("createRfcommSocket", new Class[] {int.class}).invoke(device,1);
socket.connect();

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Another tip may be to use a different UUID, it may solve the problem.

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I don't know if you tryed it yet, but similarly to what has been done in the bluetooth chat example, just before creating your ConnectThread, call this function:

public synchronized void connect(BluetoothDevice 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);
}