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    <p>For a solution based on tornado/tornadio, you SocketConnection class needs to maintain a list of connections at the class level. Your on_connect handler would add the connection to this list, and on_close would remove it. For sample pseudo-code see <a href="https://groups.google.com/forum/#!msg/python-tornado/iwGlIjOFRtQ/dDnVPZPFcEsJ" rel="nofollow">this post</a> by Serge S. Koval. The code is reproduce below:</p> <p>Declare your TornadIO connection class:</p> <pre class="lang-py prettyprint-override"><code>class MyConnection(SocketConnection): participants = set() @classmethod def broadcast(cls, msg): for p in cls.participants: p.send(msg) @classmethod def controller_msg(cls, msg): cls.broadcast(msg) </code></pre> <p>In your device polling thread, do something like:</p> <pre class="lang-py prettyprint-override"><code>while True: datum = file.readline() if len(datum) &gt; 2: t = json.loads(datum) ... def callback(): MyConnection.controller_msg(t) io_loop.add_callback(callback) </code></pre> <p>Additionally, <a href="https://bitbucket.org/Jeffrey/gevent-socketio" rel="nofollow">gevent-socketio</a> has support for message broadcast, but it's based on gevent, not tornado.</p> <h2>UPDATE:</h2> <p>tornadio2 already maintains a list of active sessions, so all you need to do is:</p> <pre class="lang-py prettyprint-override"><code>class MyConnection(SocketConnection): def broadcast(self, event, message): for session_id, session in self.session.server._sessions._items.iteritems(): session.conn.emit(event, message) </code></pre> <p>This works because each connection instance has a reference to its session, which has a reference to the global router used to create the application (stored as <code>server</code>), which maintains a list of sessions in a <code>SessionContainer</code> object in <code>_sessions</code>. Now whenever you want to broadcast a message within your connection class, just do:</p> <pre class="lang-py prettyprint-override"><code>self.broadcast('my_custom_event', 'my_event_args') </code></pre>
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    1. POIs it possible to send a message to all active WebSocket connections? Using either node.js or python tornado websockets
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    1. USTony Abou-Assaleh
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