@NonNull
	protected final BluetoothGattDescriptor sharedCccd() {
		return sharedDescriptor(CLIENT_CHARACTERISTIC_CONFIG_DESCRIPTOR_UUID,
				BluetoothGattDescriptor.PERMISSION_READ | BluetoothGattDescriptor.PERMISSION_WRITE,
				new byte[] { 0, 0 });
	}
This helper method returns a new instance of Client Characteristic Configuration Descriptor
(CCCD) that can be added to a server characteristic in {@link #initializeServer()}.

@return The CCC descriptor used to enable and disable notifications or indications.
ble/src/main/java/no/nordicsemi/android/ble/BleServerManager.java