Hi,
just wanted to let you know that I have setup up the scripts and patches to build spotify-player and librespotify for OpenWrt, for most OpenWrt targets/architectures. Both support the Spotify Connect protocol.
Feel free to use, comment and send PRs
See https://github.com/humaita-github/librespot-openwrt-ipk and https://github.com/humaita-github/spotify-player-openwrt-ipk
Best regards