[pox-dev] Offering contribution

[Felician Nemeth]

We've recently finished a project in with we heavily relied on POX.  So
let us thank Murphy and every developer for creating and making
available this great software.

Our original plan was to write general purpose POX modules, but later
we gradually gave up this plan due to time constraints.  Nevertheless, I
think some features or modules are almost ready for general usage.  If
there's an interest in some of these modules, we would happily
clean/rework the code to meet the quality requirements of POX.

This is what we can offer:

 * a (multicast) DNS responder similar to arp_responder.py

 * POXDesk enhancements:

 ** enhancements to tinytopo/TopoViewer (coloring links according to
    bandwidth usage, displaying symbolic names instead of DPIDs,
    listening to host_tracker events.)  This application relies on a
    simple statistics module from the POX side.

 ** a new MapView application that displays topology/link utilization on
    OpenStreetMap

 ** another POXDesk application that shows link utilizations as a
    function of time.

 * a SIGINT hander in order to remotely shut down POX,
  (and a SIGUSR1 hander to fire a RereadConfiguration event)

I've attached a screenshot demonstrating our POXDesk enhancements.  The
code in its current form is available from here:
https://github.com/nemethf/sigcomm2013

Thank you again,
Felicián

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