how to get the connection object of a specific user?
I am working in a real time Symfony app using Ratchet library, in this app I need to send some data to a specific user so the logic solution was to use the SessionProvider that will attach a Symfony2 Session object to each incoming Connection object. As the documentation states I have setup a non-native session handler to store my sessions i.e. in a database via PDO. and that work fine for the moment but I need to get the Connection object of a specific user to send him some data so in other way I need to find the connection object that reference to this user and I can't find a way to do it ? her's my server code :

```
$app=new AggregateApplication();
$loop   = \React\EventLoop\Factory::create();
$context = new \React\ZMQ\Context($loop);
$pull = $context->getSocket(\ZMQ::SOCKET_PULL);
$pull->bind('tcp://127.0.0.1:5555');
$pull->on('message', array($app, 'onNotification'));
$webSock = new \React\Socket\Server($loop);
$webSock->listen(8080, '127.0.0.1');
$handler = $this->getContainer()->get('session.handler');
$server=new \Ratchet\Wamp\WampServer($app);
$server = new SessionProvider($server, $handler);
$webServer = new \Ratchet\Server\IoServer(new  \Ratchet\WebSocket\WsServer($server),$webSock);
$loop->run();
```
