The shell script rspotify basically uses netcat to communicate with a remote host running a compatible server.
Some may call this a dirty hack. I kept the client clean and compliant though (as far as you can say that with the netcat stuff, lol).
It doesn't use much of a protocol, except maybe TCP if you count that. Binary operations like skipping a track are done in a binary fashion, i.e. connecting to the respective TCP port skips to the next song.
The only real data returned is the current track, artist and album. It's formating is left to the server.
This was written for Hackathons and get-togethers where 1< *nix affine people want to influence the current (Spotify) playlist connected to the big speakers.
Actually there isn't much installation required.
...you need nothing but the rspotify script itself (and Linux, *BSD, Mac OS...). Copy it somewhere you like (preferably somewhere in your $PATH) and execute it.
It takes only two arguments. The first one is the IP of the server and the second one is the base port configured on the server (by default 21337. What else.).
Example: ./rspotify 10.0.0.144 21337
You will be asked if you want to save the two parameters so you can just use rspotify in the future. If you agree, those will be written to ~/.rspotifyrc.
... well, it's a little less free here. Until now, this repository only contains a Mac OS version. If you have a somewhat recent version of Mac OS X and Spotify installted, just navigate to the server/ directory and execute ./rspotify_server. Oh, and you need to have tmux installed for this "hacky" version of a "server". Get it from Brew, for example: brew install tmux
To younix for the idea, to Conceited Software for providing parts of the Apple-Script-Spotify-Interface and to my unbeatable commitment to procrastination.
My actual home is inside this gitweb, but please feel free to send any pull requests here. They're very welcome and will be noticed.
This is free software, do whatever the hell you want to do with it. If you need help see my profile, you'll figure out how to reach me. :)