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Event Handling

Listening to Courier System Events​

Courier provides ability to register and listen to library events emitted by the Client (connect attempt/success/failure, message send/receive, subscribe/unsubscribe). All you need to do is listen to courierEventStream from CourieClient.

courierClient.courierEventStream().listen((event) {
    print("Event received: ${event}");
});

The type of the parameter is an abstract class CourierEvent with these public interfaces:

  • name: Name of the event.
  • connectionInfo Connection Info tied to the event
  • getEventPropertiesMap: A key value map containing the properties related to the event.

You can try to Cast the CourierEvent to concrete implementation that provides additional properties such as:

  • MQTTConnectAttemptEvent
  • MQTTConnectSuccessEvent
  • MQTTConnectFailureEvent
  • MQTTConnectionLostEvent
  • MQTTDisconnectEvent
  • MQTTSubscribeAttemptEvent
  • MQTTSubscribeSuccessEvent
  • ...