android.bluetooth.BluetoothGattDescriptor Java Examples

@Test
public void setNotifyIndicationTest() throws Exception {
    BluetoothGattCallback callback = connectAndGetCallback();

    BluetoothGattService service = new BluetoothGattService(SERVICE_UUID, 0);
    BluetoothGattCharacteristic characteristic = new BluetoothGattCharacteristic(UUID.fromString("00002A1C-0000-1000-8000-00805f9b34fb"),PROPERTY_INDICATE,0);
    BluetoothGattDescriptor descriptor = new BluetoothGattDescriptor(UUID.fromString("00002902-0000-1000-8000-00805f9b34fb"),0);
    service.addCharacteristic(characteristic);
    characteristic.addDescriptor(descriptor);

    when(gatt.getServices()).thenReturn(Arrays.asList(service));
    callback.onConnectionStateChange(gatt, GATT_SUCCESS, STATE_CONNECTED);

    peripheral.setNotify(characteristic, true);
    verify(gatt).setCharacteristicNotification(characteristic, true);
    assertEquals(BluetoothGattDescriptor.ENABLE_INDICATION_VALUE[0], descriptor.getValue()[0]);
    assertEquals(BluetoothGattDescriptor.ENABLE_INDICATION_VALUE[1], descriptor.getValue()[1]);
    verify(gatt).writeDescriptor(descriptor);

    callback.onDescriptorWrite(gatt, descriptor, 0);
    verify(peripheralCallback).onNotificationStateUpdate(peripheral, characteristic, 0);
}
 

@Test
public void setNotifyDisableTest() throws Exception {
    BluetoothGattCallback callback = connectAndGetCallback();
    callback.onConnectionStateChange(gatt, GATT_SUCCESS, STATE_CONNECTED);

    BluetoothGattService service = new BluetoothGattService(SERVICE_UUID, 0);
    BluetoothGattCharacteristic characteristic = new BluetoothGattCharacteristic(UUID.fromString("00002A1C-0000-1000-8000-00805f9b34fb"),PROPERTY_NOTIFY,0);
    BluetoothGattDescriptor descriptor = new BluetoothGattDescriptor(UUID.fromString("00002902-0000-1000-8000-00805f9b34fb"),0);
    service.addCharacteristic(characteristic);
    characteristic.addDescriptor(descriptor);

    when(gatt.getServices()).thenReturn(Arrays.asList(service));

    peripheral.setNotify(characteristic, false);
    verify(gatt).setCharacteristicNotification(characteristic, false);
    assertEquals(BluetoothGattDescriptor.DISABLE_NOTIFICATION_VALUE[0], descriptor.getValue()[0]);
    assertEquals(BluetoothGattDescriptor.DISABLE_NOTIFICATION_VALUE[1], descriptor.getValue()[1]);
    verify(gatt).writeDescriptor(descriptor);

    callback.onDescriptorWrite(gatt, descriptor, 0);

    verify(peripheralCallback).onNotificationStateUpdate(peripheral, characteristic, 0);
}
 

@SuppressLint("NewApi")
private void getChartacteristicValue(
		BluetoothGattCharacteristic characteristic) {
	// TODO Auto-generated method stub
	List<BluetoothGattDescriptor> des = characteristic.getDescriptors();
	Intent mIntent = new Intent(ACTION_CHAR_READED);
	if (des.size() != 0) {
		mIntent.putExtra("desriptor1", des.get(0).getUuid().toString());
		mIntent.putExtra("desriptor2", des.get(1).getUuid().toString());
	}
	mIntent.putExtra("StringValue", characteristic.getStringValue(0));
	String hexValue = Utils.bytesToHex(characteristic.getValue());
	mIntent.putExtra("HexValue", hexValue.toString());
	mIntent.putExtra("time", DateUtil.getCurrentDatatime());
	sendBroadcast(mIntent);
}
 

@NonNull
private Completable setupCharacteristicNotification(
        final UUID bluetoothGattCharacteristicUUID,
        final NotificationSetupMode setupMode,
        final boolean enabled,
        final boolean isIndication
) {
    if (setupMode == NotificationSetupMode.DEFAULT) {
        final byte[] enableValue = isIndication ? ENABLE_INDICATION_VALUE : ENABLE_NOTIFICATION_VALUE;
        return getClientConfigurationDescriptor(bluetoothGattCharacteristicUUID)
                .flatMapCompletable(new Function<BluetoothGattDescriptor, Completable>() {
                    @Override
                    public Completable apply(BluetoothGattDescriptor bluetoothGattDescriptor) {
                        return writeDescriptor(bluetoothGattDescriptor, enabled ? enableValue : DISABLE_NOTIFICATION_VALUE);
                    }
                });
    } else {
        return Completable.complete();
    }

}
 

public void setNotificationForCharacteristic(BluetoothGattCharacteristic ch, boolean enabled) {
    if (mBluetoothAdapter == null || mBluetoothGatt == null) return;
    
    boolean success = mBluetoothGatt.setCharacteristicNotification(ch, enabled);
    if(!success) {
    	Log.e("------", "Seting proper notification status for characteristic failed!");
    }
    
    // This is also sometimes required (e.g. for heart rate monitors) to enable notifications/indications
    // see: https://developer.bluetooth.org/gatt/descriptors/Pages/DescriptorViewer.aspx?u=org.bluetooth.descriptor.gatt.client_characteristic_configuration.xml
    BluetoothGattDescriptor descriptor = ch.getDescriptor(UUID.fromString("00002902-0000-1000-8000-00805f9b34fb"));
    if(descriptor != null) {
    	byte[] val = enabled ? BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE : BluetoothGattDescriptor.DISABLE_NOTIFICATION_VALUE;
     descriptor.setValue(val);
     mBluetoothGatt.writeDescriptor(descriptor);
    }
}
 

/**
 * Enables or disables notification on a give characteristic.
 *
 * @param characteristic Characteristic to act on.
 * @param enabled If true, enable notification.  False otherwise.
 */
public void setCharacteristicNotification(BluetoothGattCharacteristic characteristic,
                                          boolean enabled) {
    if (mBluetoothAdapter == null || mBluetoothGatt == null) {
        Log.w(TAG, "BluetoothAdapter not initialized");
        return;
    }
    mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);

    // This is specific to Heart Rate Measurement.
    if (UUID_HEART_RATE_MEASUREMENT.equals(characteristic.getUuid())) {
        BluetoothGattDescriptor descriptor = characteristic.getDescriptor(
                UUID.fromString(SampleGattAttributes.CLIENT_CHARACTERISTIC_CONFIG));
        descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
        mBluetoothGatt.writeDescriptor(descriptor);
    }
}
 

/**
   * Enables or disables notification on a give characteristic.
   * @param characteristic Characteristic to act on.
   * @param enabled If true, enable notification.  False otherwise.
   * @param immediate setNotification immediately, don't enqueue
   */
  public void setCharacteristicNotification(BTDeviceInfo 					deviceInfo, 
  										  BluetoothGattCharacteristic 	characteristic,
                                            boolean 						enabled) throws DeviceManagerException {
  	Log.d(TAG, "setCharacteristicNotification " + deviceInfo.getDeviceAddress() + " name = " + deviceInfo.getDevice().getName());
      if (mBluetoothAdapter == null) { 
         	throw new DeviceManagerException(mContext.getString(R.string.adapter_uninitialized));
      }
      if (deviceInfo.getGatt() == null) {
          throw new DeviceManagerException(String.format("%s %s", mContext.getString(R.string.no_gatt_info), deviceInfo.getDeviceAddress()));
      }
      
      // if there are no notification requests outstanding, we can issue one right away.
      deviceInfo.enqueueCommand(new BTLECommandSetCharacteristicNotification(deviceInfo, characteristic, true));
      // this is some serious "guess the magic word".  You have to write this characteristic to receive notififcations.
      // setCharacteristicNotification() isn't enough.
      // from http://stackoverflow.com/questions/17910322/android-ble-api-gatt-notification-not-received
      BluetoothGattDescriptor descriptor = characteristic.getDescriptor(UUID.fromString(BTUUID.CHARACTERISTIC_UPDATE_NOTIFICATION_DESCRIPTOR_UUID));
      descriptor.setValue(enabled ? BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE : new byte[] { 0x00, 0x00 });
deviceInfo.enqueueCommand(new BTLECommandWriteDescriptor(deviceInfo, descriptor));
  }
 

@Test
public void testCopyDescriptor(){
    byte[] data = new byte[]{0x01, 0x02, 0x03};
    BluetoothGattDescriptor descriptor = mock(BluetoothGattDescriptor.class);
    // this should be the same as the real thing, the data inside could change as it's pointing
    // to something else.
    when(descriptor.getValue()).thenReturn(data);
    when(descriptor.getUuid()).thenReturn(UUID.fromString("E69169D1-11A7-4545-B7FC-02A3ADFC3EAC"));
    when(descriptor.getPermissions()).thenReturn(BluetoothGattDescriptor.PERMISSION_READ);
    BluetoothGattDescriptorCopy result = new GattUtils().copyDescriptor(descriptor);
    if(result == null) {
        fail(String.format(Locale.ENGLISH, "The result was null for descriptor: %s, with data: %s", descriptor.getUuid(), Arrays.toString(descriptor.getValue())));
        return;
    }
    data[2] = 0x04;
    Assert.assertNotEquals(Arrays.hashCode(data), Arrays.hashCode(result.getValue()));
}
 

@Test
public void testCopyDescriptorWithNullValue(){
    byte[] data = null;
    BluetoothGattDescriptor descriptor = mock(BluetoothGattDescriptor.class);
    // this should be the same as the real thing, the data inside could change as it's pointing
    // to something else.
    when(descriptor.getValue()).thenReturn(data);
    when(descriptor.getUuid()).thenReturn(UUID.fromString("E69169D1-11A7-4545-B7FC-02A3ADFC3EAC"));
    when(descriptor.getPermissions()).thenReturn(BluetoothGattDescriptor.PERMISSION_READ);
    BluetoothGattDescriptorCopy result = new GattUtils().copyDescriptor(descriptor);
    if(result == null) {
        fail(String.format(Locale.ENGLISH, "The result was null for descriptor: %s, with data: %s", descriptor.getUuid(), Arrays.toString(descriptor.getValue())));
        return;
    }
    Assert.assertNull(result.getValue());
}
 

@Test
public void testCopyCharacteristicWithDescriptorChild(){
    byte[] data = null;
    BluetoothGattCharacteristic characteristic = mock(BluetoothGattCharacteristic.class);
    // this should be the same as the real thing, the data inside could change as it's pointing
    // to something else.
    when(characteristic.getValue()).thenReturn(data);
    when(characteristic.getUuid()).thenReturn(UUID.fromString("E69169D1-11A7-4545-B7FC-02A3ADFC3EAC"));
    when(characteristic.getPermissions()).thenReturn(BluetoothGattCharacteristic.PERMISSION_READ);
    when(characteristic.getProperties()).thenReturn(BluetoothGattCharacteristic.PROPERTY_NOTIFY);
    BluetoothGattDescriptor descriptor = mock(BluetoothGattDescriptor.class);
    // this should be the same as the real thing, the data inside could change as it's pointing
    // to something else.
    when(descriptor.getValue()).thenReturn(data);
    when(descriptor.getUuid()).thenReturn(UUID.fromString("E69169D1-11A7-4545-B7FC-02A3ADFC3EAC"));
    when(descriptor.getPermissions()).thenReturn(BluetoothGattDescriptor.PERMISSION_READ);
    characteristic.addDescriptor(descriptor);
    BluetoothGattCharacteristicCopy result = new GattUtils().copyCharacteristic(characteristic);
    if(result == null) {
        fail(String.format(Locale.ENGLISH, "The result was null for characteristic: %s, with data: %s", characteristic.getUuid(), Arrays.toString(characteristic.getValue())));
        return;
    }
    Assert.assertNotEquals(descriptor, characteristic.getDescriptor(descriptor.getUuid()));
}
 

@Override
public void onDescriptorWrite(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) {
    Log.d(TAG_LOG, " onDescriptorWrite:: " + status);
    // Notification source
    if (status == BluetoothGatt.GATT_SUCCESS) {
        Log.d(TAG_LOG, "status: write success ");
        //find music controll service
        Log.d(TAG_LOG, "*+*+*+*+*+*+*+*+*+*+ find music control");
        BluetoothGattService service = bluetooth_gatt.getService(UUID.fromString(service_ams));
        if(service != null) {
            BluetoothGattCharacteristic chara = service.getCharacteristic(UUID.fromString(characteristics_entity_update));
            if(chara != null) {
                chara.setValue(new byte[]{(byte) 0x02, (byte) 0x00, (byte) 0x02});
                bluetooth_gatt.writeCharacteristic(chara);
            }
        }
    }
}
 

@Override
public void onExecute(@NonNull BluetoothGatt gatt) {
    BluetoothGattDescriptor d = extractDescriptor(gatt);
    if (d == null) {
        postOnError(ErrorStrings.NO_DESCRIPTOR);
        return;
    }

    if (!d.setValue(data)) {
        postOnError(ErrorStrings.VALUE_STORE_FAIL);
        return;
    }

    if (!gatt.writeDescriptor(d)) {
        postOnError(ErrorStrings.WRITE_OP_INIT_FAIL);
    }
}
 

/**
 * Enables or disables notification on a give characteristic.
 *
 * @param address        The address.
 * @param characteristic Characteristic to act on.
 * @param enabled        If true, enable notification.  False otherwise.
 */
public void setCharacteristicNotification(String address,
                                          BluetoothGattCharacteristic characteristic,
                                          boolean enabled) {
    if (mBluetoothAdapter == null || mBluetoothGattMap.get(address) == null) {
        Log.w(TAG, "BluetoothAdapter not initialized");
        return;
    }
    mBluetoothGattMap.get(address).setCharacteristicNotification(characteristic, enabled);

    BluetoothGattDescriptor descriptor = characteristic.getDescriptor(
            UUID.fromString(GattAttributes.DESCRIPTOR_CLIENT_CHARACTERISTIC_CONFIGURATION));
    descriptor.setValue(enabled ? BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE :
            BluetoothGattDescriptor.DISABLE_NOTIFICATION_VALUE);
    mBluetoothGattMap.get(address).writeDescriptor(descriptor);
}
 

public void characteristicDisableNotify(@NonNull final BluetoothGattCharacteristic characteristic, CompletionHandler completionHandler) {
    final String identifier = getCharacteristicIdentifier(characteristic);
    BleCommand command = new BleCommand(BleCommand.BLECOMMANDTYPE_SETNOTIFY, kDebugCommands ? identifier : null, completionHandler) {

        @Override
        public void execute() {

            BluetoothGattDescriptor descriptor = characteristic.getDescriptor(kClientCharacteristicConfigUUID);
            if (mBluetoothGatt != null && descriptor != null && (characteristic.getProperties() & BluetoothGattCharacteristic.PROPERTY_NOTIFY) != 0) {
                mNotifyHandlers.remove(identifier);
                descriptor.setValue(BluetoothGattDescriptor.DISABLE_NOTIFICATION_VALUE);
                mBluetoothGatt.writeDescriptor(descriptor);
            } else {
                Log.w(TAG, "disable notify: client config descriptor not found for characteristic: " + characteristic.getUuid().toString());
                finishExecutingCommand(BluetoothGatt.GATT_FAILURE);
            }
        }
    };
    mCommmandQueue.add(command);
}
 

private boolean internalEnableNotifications(final BluetoothGattCharacteristic characteristic) {
	final BluetoothGatt gatt = bluetoothGatt;
	if (gatt == null || characteristic == null)
		return false;

	// Check characteristic property
	final int properties = characteristic.getProperties();
	if ((properties & BluetoothGattCharacteristic.PROPERTY_NOTIFY) == 0)
		return false;

	gatt.setCharacteristicNotification(characteristic, true);
	final BluetoothGattDescriptor descriptor = characteristic.getDescriptor(CLIENT_CHARACTERISTIC_CONFIG_DESCRIPTOR_UUID);
	if (descriptor != null) {
		descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
		return internalWriteDescriptorWorkaround(descriptor);
	}
	return false;
}
 

private boolean internalEnableNotifications(@Nullable final BluetoothGattCharacteristic characteristic) {
	final BluetoothGatt gatt = bluetoothGatt;
	if (gatt == null || characteristic == null || !connected)
		return false;

	final BluetoothGattDescriptor descriptor = getCccd(characteristic, BluetoothGattCharacteristic.PROPERTY_NOTIFY);
	if (descriptor != null) {
		log(Log.DEBUG, "gatt.setCharacteristicNotification(" + characteristic.getUuid() + ", true)");
		gatt.setCharacteristicNotification(characteristic, true);

		descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
		log(Log.VERBOSE, "Enabling notifications for " + characteristic.getUuid());
		log(Log.DEBUG, "gatt.writeDescriptor(" +
				BleManager.CLIENT_CHARACTERISTIC_CONFIG_DESCRIPTOR_UUID + ", value=0x01-00)");
		return internalWriteDescriptorWorkaround(descriptor);
	}
	return false;
}
 

private BleGattExecutor.ServiceAction serviceIndicateAction(final BluetoothGattService gattService, final String characteristicUuidString, final boolean enable) {
    return new BleGattExecutor.ServiceAction() {
        @Override
        public boolean execute(BluetoothGatt bluetoothGatt) {
            if (characteristicUuidString != null) {
                final UUID characteristicUuid = UUID.fromString(characteristicUuidString);
                final BluetoothGattCharacteristic dataCharacteristic = gattService.getCharacteristic(characteristicUuid);

                if (dataCharacteristic == null) {
                    Log.w(TAG, "Characteristic with UUID " + characteristicUuidString + " not found");
                    return true;
                }

                final UUID clientCharacteristicConfiguration = UUID.fromString(CHARACTERISTIC_CONFIG);
                final BluetoothGattDescriptor config = dataCharacteristic.getDescriptor(clientCharacteristicConfiguration);
                if (config == null)
                    return true;

                // enableNotification/disable remotely
                config.setValue(enable ? BluetoothGattDescriptor.ENABLE_INDICATION_VALUE : BluetoothGattDescriptor.DISABLE_NOTIFICATION_VALUE);
                bluetoothGatt.writeDescriptor(config);

                return false;
            } else {
                Log.w(TAG, "Characteristic UUID is null");
                return true;
            }
        }
    };
}
 

/**
 * Returns the Client Characteristic Config Descriptor if the characteristic has the
 * required property. It may return null if the CCCD is not there.
 *
 * @param characteristic   the characteristic to look the CCCD in.
 * @param requiredProperty the required property: {@link BluetoothGattCharacteristic#PROPERTY_NOTIFY}
 *                         or {@link BluetoothGattCharacteristic#PROPERTY_INDICATE}.
 * @return The CCC descriptor or null if characteristic is null, if it doesn't have the
 * required property, or if the CCCD is missing.
 */
private static BluetoothGattDescriptor getCccd(@Nullable final BluetoothGattCharacteristic characteristic,
											   final int requiredProperty) {
	if (characteristic == null)
		return null;

	// Check characteristic property
	final int properties = characteristic.getProperties();
	if ((properties & requiredProperty) == 0)
		return null;

	return characteristic.getDescriptor(BleManager.CLIENT_CHARACTERISTIC_CONFIG_DESCRIPTOR_UUID);
}
 

@Override public void onDescriptorWriteRequest( final BluetoothDevice device, final int requestId, final BluetoothGattDescriptor descriptor, final boolean preparedWrite, final boolean responseNeeded, final int offset, final byte[] value)
{
	m_server.getManager().getPostManager().runOrPostToUpdateThread(new Runnable()
	{
		@Override public void run()
		{
			onWriteRequest_updateThread(device, value, requestId, offset, preparedWrite, responseNeeded, descriptor.getCharacteristic().getService().getUuid(), descriptor.getCharacteristic().getUuid(), descriptor.getUuid());
		}
	});
   }
 

public void setCharacteristicIndication(BluetoothGattCharacteristic characteristic, boolean enabled) {
    Log.i(TAG, "Characteristic setting indication");
    if (mBluetoothGatt != null) {
        mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);
        BluetoothGattDescriptor descriptor = characteristic.getDescriptor(UUID.fromString(HM10Attributes.CLIENT_CHARACTERISTIC_CONFIG));
        Log.i(TAG, "Descriptor found: " + descriptor.getUuid());
        descriptor.setValue(BluetoothGattDescriptor.ENABLE_INDICATION_VALUE);
        mBluetoothGatt.writeDescriptor(descriptor);
    }
}
 

@Override public void onDescriptorWriteRequest( final BluetoothDevice device, final int requestId, final BluetoothGattDescriptor descriptor, final boolean preparedWrite, final boolean responseNeeded, final int offset, final byte[] value)
{
	m_server.getManager().getPostManager().runOrPostToUpdateThread(new Runnable()
	{
		@Override public void run()
		{
			onWriteRequest_updateThread(device, value, requestId, offset, preparedWrite, responseNeeded, descriptor.getCharacteristic().getService().getUuid(), descriptor.getCharacteristic().getUuid(), descriptor.getUuid());
		}
	});
   }
 

@Override
public void onDescriptorWrite(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) {
    Log.i(TAG, "Wrote a discriptor, status: " + status);
    if(step == 2 && currentGattTask == GATT_SETUP) {
        setListeners(2);
    } else if(step == 3) {
        setListeners(3);
    } else if(step == 4) {
        setListeners(4);
    } else if(step == 5) {
        Log.i(TAG, "Done setting Listeners");
    }
}
 

@Override
public void onDescriptorRead(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) {

    Log.d(TAG, "DescriptorRead, : Status " + status + " Data : " + new String(descriptor.getValue(), StandardCharsets.UTF_8));

    if (status != BluetoothGatt.GATT_SUCCESS) {
        Log.e(TAG, "Failed to read descriptor");
        EventBus.getDefault().post(new DeviceConnectionEvent(ESPConstants.EVENT_DEVICE_CONNECTION_FAILED));
        return;
    }

    byte[] data = descriptor.getValue();

    String value = new String(data, StandardCharsets.UTF_8);
    uuidMap.put(value, descriptor.getCharacteristic().getUuid().toString());
    Log.d(TAG, "Value : " + value + " for UUID : " + descriptor.getCharacteristic().getUuid().toString());

    if (isReadingDescriptors) {

        readNextDescriptor();

    } else {

        BluetoothGattCharacteristic characteristic = service.getCharacteristic(UUID.fromString(uuidMap.get(ESPConstants.HANDLER_PROTO_VER)));

        if (characteristic != null) {
            // Write anything. It doesn't matter. We need to read characteristic and for that we need to write something.
            characteristic.setValue("ESP");
            bluetoothGatt.writeCharacteristic(characteristic);
        }
    }
}
 

@Override
public void onServicesDiscovered(BluetoothGatt gatt, int status) {
    super.onServicesDiscovered(gatt, status);
    if (status == BluetoothGatt.GATT_SUCCESS) {
        writeLine("Service discovery completed!");
    }
    else {
        writeLine("Service discovery failed with status: " + status);
    }
    // Save reference to each characteristic.
    tx = gatt.getService(UART_UUID).getCharacteristic(TX_UUID);
    rx = gatt.getService(UART_UUID).getCharacteristic(RX_UUID);
    // Setup notifications on RX characteristic changes (i.e. data received).
    // First call setCharacteristicNotification to enable notification.
    if (!gatt.setCharacteristicNotification(rx, true)) {
        writeLine("Couldn't set notifications for RX characteristic!");
    }
    // Next update the RX characteristic's client descriptor to enable notifications.
    if (rx.getDescriptor(CLIENT_UUID) != null) {
        BluetoothGattDescriptor desc = rx.getDescriptor(CLIENT_UUID);
        desc.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
        if (!gatt.writeDescriptor(desc)) {
            writeLine("Couldn't write RX client descriptor value!");
        }
    }
    else {
        writeLine("Couldn't get RX client descriptor!");
    }
}
 

@Override
public final boolean writeDescriptor(BluetoothGattDescriptor descriptor)
{
    if (m_gatt != null && descriptor != null)
    {
        return m_gatt.writeDescriptor(descriptor);
    }
    return false;
}
 

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public BLEServicePeripheral(final Activity activity) {
    super(activity);

    mBtAdvertiser = mBtAdapter.getBluetoothLeAdvertiser();
    mBtGattCharacteristic = new BluetoothGattCharacteristic(
            UUID.fromString(CHARACTERISTIC_UUID),
            BluetoothGattCharacteristic.PROPERTY_NOTIFY | BluetoothGattCharacteristic.PROPERTY_READ | BluetoothGattCharacteristic.PROPERTY_WRITE
            , BluetoothGattDescriptor.PERMISSION_WRITE | BluetoothGattCharacteristic.PERMISSION_READ);
    BluetoothGattDescriptor dataDescriptor = new BluetoothGattDescriptor(
            UUID.fromString(CHARACTERISTIC_CONFIG_UUID),
            BluetoothGattDescriptor.PERMISSION_WRITE | BluetoothGattDescriptor.PERMISSION_READ);
    mBtGattCharacteristic.addDescriptor(dataDescriptor);
}
 

protected void writeNextDescriptor() {
    if (iterDescriptor.hasNext()) {
        lastDescriptor = iterDescriptor.next();

        if (lastDescriptor.getCharacteristic() == mBluetoothCharact) {
            lastDescriptor.setValue(Common.isSetProperty(Common.PropertyType.NOTIFY, mBluetoothCharact
                    .getProperties()) ? BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE
                    : BluetoothGattDescriptor.ENABLE_INDICATION_VALUE);
            //mBluetoothLeService.writeDescriptor(mDevice, lastDescriptor);
            mDevice.writeDescriptor(lastDescriptor);
        }
    }
}
 

public WriteGattServerCharacteristicDescriptorValueTransaction(@Nullable GattServerConnection connection, GattState successEndState, BluetoothGattService service, BluetoothGattCharacteristic characteristic, BluetoothGattDescriptor descriptor, byte[] data) {
    super(connection, successEndState);
    this.descriptor = descriptor;
    this.characteristic = characteristic;
    this.service = service;
    this.data = data;
}
 

public WriteGattServerCharacteristicDescriptorValueTransaction(@Nullable GattServerConnection connection, GattState successEndState, BluetoothGattService service, BluetoothGattCharacteristic characteristic, BluetoothGattDescriptor descriptor, byte[] data, long timeoutMillis) {
    super(connection, successEndState, timeoutMillis);
    this.descriptor = descriptor;
    this.characteristic = characteristic;
    this.service = service;
    this.data = data;
}
 

public void onDescriptorWrite(BluetoothGatt gatt,
		BluetoothGattDescriptor descriptor, int status) {
	String address = gatt.getDevice().getAddress();
	Log.d(TAG, "onDescriptorWrite " + address + " status " + status);
	BleRequest request = mService.getCurrentRequest();
	if (request.type == RequestType.CHARACTERISTIC_NOTIFICATION
			|| request.type == RequestType.CHARACTERISTIC_INDICATION
			|| request.type == RequestType.CHARACTERISTIC_STOP_NOTIFICATION) {
		if (status != BluetoothGatt.GATT_SUCCESS) {
			mService.requestProcessed(address,
					RequestType.CHARACTERISTIC_NOTIFICATION, false);
			return;
		}
		if (request.type == RequestType.CHARACTERISTIC_NOTIFICATION) {
			mService.bleCharacteristicNotification(address, descriptor
					.getCharacteristic().getUuid().toString(), true,
					status);
		} else if (request.type == RequestType.CHARACTERISTIC_INDICATION) {
			mService.bleCharacteristicIndication(address, descriptor
					.getCharacteristic().getUuid().toString(), status);
		} else {
			mService.bleCharacteristicNotification(address, descriptor
					.getCharacteristic().getUuid().toString(), false,
					status);
		}
		return;
	}
}