requestNotificationPermissions method
The function requestBLEPermissions in Dart is used to request notification permissions and returns a Future that
resolves to a String.
@returns The method is returning a Future object that resolves to a String or null.
Implementation
@override
Future<String?> requestNotificationPermissions() async {
final returnVal = await methodChannel
.invokeMethod<String>('requestNotificationPermissions');
return returnVal;
}