A Python-based Channel Access WebSockets Server
This is a tiny web server for getting channel access data via a WebSockets connection. Useful if you want to make a website that displays a real-time updating value of some PVs. Built with Bottle, PyEpics, and Geventwebsockets.
First, establish a WebSockets connection to the server's '/monitor' URL.
var ws = new WebSocket("ws://localhost:8888/monitor");Send messages to the server to connect to PVs:
socket.send({"action":"connect", "pv":"myPVName"});Sit back and wait for messages to roll in. The messages are JSON dictionaries with this format:
{ "msg_type": "monitor", "pvname": pvname, "value": value, "count": count, "timestamp": timestamp }If you want to stop listening to a PV, send the server a disconnect message:
socket.send({"action":"disconnect", "pv":"myPVName"});That is pretty much it. For more details, see the wiki. Have fun!