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To be a bit more on topic, the central protocol is pretty well documented, though you're looking in the wrong place. Look up the many replacement rio receiver servers, and you'll see what people have done. Then flip the spec over, and start reading it upside down, and you'll see what needs to be done.

It would certainly be possible to gateway Receiver protocol onto UPnP, but that's probably not what you want to do -- the querying available over Receiver protocol is less than you'd wish for. You can't even get a list of albums by a given artist, for instance.

What you actually want to do is lash up gmediaserver so that it runs on the Central and reads the *0 and *1 files directly to populate its database (rather than using ftw() and metadata extraction).

Peter