code: func (el *ChannelEventListener) RegReceivedMessages() *ChannelEventListener {
  	el.ReceivedMessage = make(chan bundle.Bundle)
  	el.ids = append(el.ids, el.em.RegisterListener(func(data interface{}) {
  		el.ReceivedMessage <- data.(bundle.Bundle)
  	}, poller.EventReceivedMessage))
  	return el
  }
docs: // RegReceivedMessages registers this listener to listen for incoming messages.