code: @Override
      public void onMessageDelivered(MessageDeliveredEvent event) {
          for (IMessagingListener listener : messagingListeners) {
              try {
                  listener.onMessageDelivered(event);
              } catch (Exception e) {
                  logError(e, "message delivered "+event.getMessageId());
              }
          }
      }
docs: Dispatch conversation message update event.
  
  @param event Event to dispatch.