BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                int pin = intent.getIntExtra("android.bluetooth.device.extra.PAIRING_KEY", 0);

                Class<?> btDeviceInstance = Class.forName(BluetoothDevice.class.getCanonicalName());

                Method convert = btDeviceInstance.getMethod("convertPinToBytes", String.class);

                byte[] pinBytes = (byte[]) convert.invoke(device, pin);

                Method setPin = btDeviceInstance.getMethod("setPin", byte[].class);
                Boolean success = (Boolean) setPin.invoke(device, pinBytes);
                if (success)
                    Log.d(TAG, "Success to add the PIN.");

                device.getClass().getMethod("setPairingConfirmation", boolean.class).invoke(device, true);

                setBluetoothPairingPin(device, String.valueOf(pin));