Getting Java.io.ioexception: Read Failed, Socket Might Closed Or Timeout, Read Ret: -1 While Printing Via Bluetooth Printer

Code is working fine for first time only, if i am trying to connect it again it is throwing this exception: read failed, socket might closed or timeout, read ret: -1 This is my f

Solution 1:

You should close your socket after using it :

publicbooleanopenBT(Context context)throws IOException {
try {
    // Standard SerialPortService IDUUIDuuid= UUID.fromString("00001101-0000-1000-8000-00805f9b34fb");
    mmSocket = mmDevice.createRfcommSocketToServiceRecord(uuid);
    mBluetoothAdapter.cancelDiscovery();

    mmSocket.connect();

    mmOutputStream = newDataOutputStream(mmSocket.getOutputStream());
    mmInputStream = newDataInputStream(mmSocket.getInputStream());

    mmSocket.close(); //Socket closed
} catch (NullPointerException e) {
    e.printStackTrace();
    returnfalse;
} catch (Exception e) { 
     e.printStackTrace();
    returnfalse;

}

returntrue;}

Solution 2:

Check your UUID and try this if you don't know the UUID:

UUIDuuidSting=null;
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1) {
    uuidSting = bluetoothDevice.getUuids()[0].getUuid();
}

instead use:

UUIDuuid= UUID.fromString("00001101-0000-1000-8000-00805f9b34fb");