[brkho]

I wrote a blog post about WebRTC data channels which has the complete source for a proof of concept in a gaming context: http://blog.brkho.com/2017/03/15/dive-into-client-server-web...

The example in my blog post isn't really minimal because it assumes that you're writing your server in C++ for performance reasons. You can cut away a lot of the setup and boilerplate if you're fine with your server running on node and delegating all WebRTC tasks to a background electron process (see electron-webrtc).

Also, recently Mozilla has released their own WebRTC abstraction (https://hacks.mozilla.org/2017/06/introducing-humblenet-a-cr...) which seems to be easy to use on the server. I personally haven't tried it yet, but I've heard good things.