Programmatically reset position fix (Reach M, M+)?

From this thread: Reach HTTP API for mobile app integration - #7 by oliv, I learned that it might be possible to send commands via websocket, like {“name”: “start rover”}. From a .js file I found on the reach, I see this line: d.a.emit('restart rtklib'), which is exactly what I think I want to do. Question is: what’s the correct URL? I’ve tried ws://192.168.2.15:80, but the connection fails, right from the start. Anybody have any experience sending websocket commands to this thing?