MessageListener is an Interface to be implemented by all objects that want to
receive and decode notification messages from readers operating in Autonomous
Mode.
Constructs a MessageListenerService which listens for reader notifications
on the port specified by listenerPort, using the default (chosen
by ServerSocket) Ethernet interface.
Constructs a MessageListenerService which listens for reader notifications
on the port specified by listenerPort, using the specified Ethernet
interface.