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Unfortunately, all of the really interesting information gathering packets in openflow, such as feature request or description request, are designed to be sent from the openflow controller to the switch (played here by nmap) rather than the other way around. For newer versions of openflow (>= 1.3), we are able to at least enumerate all supported versions of the protocol spoken by the controller.
dmiller-nmap left a comment
This is really good. Fix up the one call to comm.tryssl and we'll call it good. I'd do it myself before merging but I'd like for you to verify that it still works against the service.