onReceive method

@override void onReceive(LocalityEvent localityEvent)

React to events being thrown. Use switch case on the localityEvent.event

Implementation

@override
void onReceive(LocalityEvent localityEvent) {
  switch (localityEvent.event) {
    case 'increaseCounter':
      counter += localityEvent.payload['amount'] as int;
      notifyListeners();
      break;
  }
}