Check function whether WebSocket is enabled in network
There are quite a number of wifi admins who only alow ports 80 and 443. Thus we need a function that on loading the landing page will check the WebSocket connection and inform the user accordingly.
Test the speed of the server-connection and inform the user on a red/green scale how slow/fast the connection currently is. Fallback-methods (like flash or long polling) are not working well enough to use them in the practice.
We need a websocket-function which tests the Distributed-Data-Protocol. This function should be a specific arsnova-click one, which measures the response-time and calculates the color from the data.