This is some notes jotted down while trying to get an old USB sound card, connected to an Asus RT-AC66U router, to output music -- both from local MP3 files and Spotify.
Initially the idea was to run Mopidy on the router, but one of its core dependencies, libspotify, is not (yet) compiled for the MIPS architecture the Asus router runs under.
Maybe that will change some time: http://community.spotify.com/t5/Spotify-Ideas/libspotify-for-the-Mipsel-processor-Architecture/idi-p/36599
For now, Mopidy will have to run on another device on the network, and stream audio to the router.