startNotifications method

Future<void> startNotifications()

Request the BluetoothCharacteristic to start notifying. This means that the Bluetooth device will give an event everytime that the value of the characteristic changes.

• May throw NotSupportedError if the operation is not allowed. Check properties to see if it is supported.

• May throw SecurityError if the characteristic is blocked from reading using the blocklist.

• May throw NetworkError if the device is not connected or if there is an error with the communication.

• May throw StateError if the characteristic is null.

See: stopNotifications, isNotifying, value and lastValue.

Implementation

Future<void> startNotifications() async {
  try {
    await _characteristic.startNotifications();
    _isNotifying = true;
  } catch (e) {
    final error = e.toString().trim();
    if (error.startsWith("NotSupportedError")) {
      throw NotSupportedError(uuid);
    } else if (error.startsWith("NetworkError")) {
      throw NetworkError.withUUid(uuid);
    } else if (error.startsWith("SecurityError")) {
      throw SecurityError(uuid, error);
    } else if (error.startsWith("InvalidStateError")) {
      throw StateError("Characteristic is null");
    }
    rethrow;
  }
}