Sets the communication controller for this communication processor. The
communication controller provides the methods through which this
processor can register channels and timers. The processor should use this
method to register its channels (and possibly some timers), so that one
of its process methods will be called later. This method is only called
once. There are no guarantees about the thread from which this method is
called. In particular, the calling thread does not have to be the
communication thread of the communication controller and registration
this method performs can be active before this method returns.
communicationController - communication controller responsible for this processor.