RCXPort provides an interface similar to java.net.Socket
Adapted from original code created by the LEGO3 Team at DTU-IAU
Uses Reliable low-level comms for communication.
This is a two-layer comms stack consisting of LLCReliableHandler
and LLCHandler. It ensures that all packets get through.
Communication will stop when the IR tower is not in view or in range,
and will resume when it comes back into view.
RCXPort does not support addressing - it broadcasts messages to all devices.