sockjs multiplex

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I try this example: https://github.com/sockjs/websocket-multiplex/blob/master/examples/sockjs/server.js

Why in channel I can not get connection id:

var ann = multiplexer.registerChannel('ann');
ann.on('connection', function(conn) {
    console.log(conn.id) // -> return undefined
    conn.write('Ann says hi!');
    conn.on('data', function(data) {
        conn.write('Ann nods: ' + data);
    });
});