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# Copyright (c) 2016 Weitian LI <liweitianux@live.com>
# MIT license
"""
Communicate with the "fg21sim" simulation program through the Web UI using
the WebSocket_ technique, which provides full-duplex communication channels
over a single TCP connection.
.. _WebSocket: https://en.wikipedia.org/wiki/WebSocket ,
http://caniuse.com/#feat=websockets
"""
import tornado.websocket
class EchoWSHandler(tornado.websocket.WebSocketHandler):
def open(self):
print("WebSocket opened")
def on_message(self, message):
print("Message received: %s" % message)
msg_back = message[::-1]
print("Message sent back: %s" % msg_back)
self.write_message(msg_back)
def on_close(self):
print("WebSocket closed")
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