startNotifications method
Implementation
@override
Future<void> startNotifications() async {
backend.UniversalBle.onValueChange =
(String deviceId, String characteristicId, Uint8List value) {
if (characteristicId == this.characteristicId) {
notifyData(value);
}
};
backend.UniversalBle.setNotifiable(deviceId, serviceId, characteristicId,
backend.BleInputProperty.notification);
}