Hi All - does anyone have any info/documentation on how Philips implemented UPnP on Prontos? Or any pointers to general reference guides to UPnP?

I'm looking to build a separate Sonos module for the Pronto which will (at the least) allow integration of Sonos with Pronto for simple actions such as accessing line-in sources for zones/groups, and volume. I need this so I can start using my Sonos more as a multi-room, multi-source system, rather than a standalone multiroom music system.

I am new to UPnP but I'm OK with Javascript/Prontoscript so if I can get up to speed with UPnP I hope to crack this one. Once the base module is there can then consider additions (music queues, services, radio, etc). I want this to be a dedicated/optimised Pronto/Sonos module and not like the (unusably sluggish) Philips module.

Appreciate any UPnP help!