This looks like a thin wrapper over gevent-websocket. The code is slightly longer than the README: https://github.com/kennethreitz/flask-sockets/blob/master/fl...
Not to discredit the attempt to make gevent-websocket more accessible, but there's nothing really new here. Here's an example of using gevent-websocket with flask without this library: https://gist.github.com/lrvick/1185629