at_notify.dart

Future<void> incrementCounter(String key) async {
    AtKey atKey = AtKey();
    atKey.key = key;

    /// Share with the other sign
    if(shareWith) {
      atKey.sharedWith = AtConstants().atMap[atProtocolService.currentAtSign];
    }

    counter++;

    await atProtocolService.atClientImpl.put(atKey, counter.toString());

    if (key == 'one') {
      
      /// This line enables this @sign to notify another @sign
      await atProtocolService.atClientImpl.notify(atKey, counter.toString(), OperationEnum.update);
      one = counter.toString();
    } else if (key == 'two') {
      two = counter.toString();
    } else if (key == 'three') {
      three = counter.toString();
    }

    notifyListeners();
  }