@Override
 public void receiveData(byte[] data) {
   for (IBluetoothHandler btHandler : bluetoothHandlers) btHandler.receiveHandler(data);
 }
 /*
    This function adds discovered device to the list and notify.
 */
 protected void addDiscoveredList(BluetoothDevice device) {
   discoveredDevices.add(device);
   for (IBluetoothHandler btHandler : bluetoothHandlers) btHandler.discoveryHandler(device);
 }