It's not really that novel. When I wrote a Sonos client (2007) there were a few out there already. Getting things working did involve a lot of time in Netmon (nee: Wireshark), and reading UPnP specs.

https://github.com/NathanHowell/Sonority https://github.com/NathanHowell/upd2 <-- update image extractor

A few of us went a bit further, found some telnet backdoors and cracked the root password.