Structuring an Application Programming Interface

Trying to put together an Application Programming Interface given the following:

Communication Protocol:
Ethernet
General Purpose IO (GPIO)
P1553
HS-1760
Discrete Inputs
/etc

Now Ethernet and GPIO could be classified as 'Debug' aids/functionality - if you will.

So I have a Subject and four Listeners.  Subject and Listener act as -users if you will of the abovementioned protocols.  
Subject:
  P1553
  GPIO,  Enet (Debugging Aids)
Listeners:
  HS-1760
  P1553
  GPIO,  Enet (Debugging Aids)

Lastly, the code executes in two environments... Real Hardware (memory is mapped to FPGA addresses) or Simulation (using PC memory).  This leads me to:

API:
  Simulation
   Hardware

How could I structure this in real source?  Seems like the potential for a host of inheritance looms large.    If you could structure this using example source that would be great.  i.e
      class Base {};  class Derived : public Base {} ;
Except use the names given above.

forums_mpAsked:
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itsmeandnobodyelseCommented:
>>>> So I have a Subject and four Listeners.
Normally you call it Server and Clients.

>>>> How could I structure this in real source?
You have to decide if you really want to make a design based on hardware or kernel protocols. Actually I never experienced such a design in the last 20 years or more. Look at Windows operation system. Since NT it has a 'hardware abstraction layer' HAL which make all services independent from hardware but put that task to special drivers. Same thing for network communication. Normal TCP/IP has 7 layers where there is rarely a need to dice deeper than layer 6. Ethernet would be at layer 2 if I remember rightly. Even a peer-to-peer connection using the Internet was not fully build up from scratch programmatically but requires a bundle of services or tools which make the application programming independent of any hardware, protocols or memory addresses. So you can test a peer-to-peer at one single local computer by only changing names and without any knowledge of any physical or system logical settings and environments.
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forums_mpAuthor Commented:
The design will be structured around hardware protocol.  I suspect I could have two special drivers; one to talk with the memory map of the FPGA and the other to deal with PC memory (when I'm in a simulation environment .. it's PC memory).  
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forums_mpAuthor Commented:
Come to think of it I guess the special drivers (reading your post again) would be the ethernet/GPIO etc. Correct?  Just trying to create a class diagram in my - if you will - head
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forums_mpAuthor Commented:
I have a question for you.  Referencing the link:

http://www.experts-exchange.com/Programming/Languages/CPP/Q_21615196.html

With regards to your trace class.  You said: "Tell me if you need some of these functions.", then you later alluded to the trace utility in C that you later advanced to C++.  Is it possible for you to upload both the C and C++ version to this thread?   I was tempted to start another thread surrounding a logger class.  I did a search on the site and came across the 'simple C++ Logging' thread.  

Let me know.  Worse case I'll provide an email address where you could email source.   Lastly, I'll  increase the points
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