I'm now able to find the time to run my receiver and NT 2 using my packet-sniffer. I'm trying to map the protocol.
One interesting thing is that the receiver apparently makes an HTTP/1.1 to 184.108.40.206 and identifies itself as running linux/2.4.16 UPnP/1.0 Onkyo-NetworkAudioPlay /1.0.
Another interesting thing is the it shows it's location as:
Which, when I go to it, it gives an error 404, and seems to be running a web server made by this site:
http :// www . acme . com / software / thttpd/
I'll let you guys know as I find out more. It would seem that if Onkyo is using linux, they might be in violation of the GPL.