This is repo contains an MVC3 example including a XSockets.NET development server (as well as hosting service), it shows how to create custom controllers that deals with binary websocket messages.
In the XSocketsHandler project (controller plugin project) you will find the MyCustomBinaryController.cs (controller) that implements the "specific" server side actions.
More information regarding XSockets.NET Server-Side API and Client (JSAPI) can be found on http://xsockets.net
If you need assistance send and email to email@example.com
Kind regards Team XSockets.NET