ZMQ Ratchet PUSH/PULL not working - php

Question

I followed this tutorial socketo/push to push messages from the server to the client in real time. I'm using the CodeIgniter framework. These are my files:
push-server.php
$loop = React\EventLoop\Factory::create();
$pusher = new MyApp\Pusher;
// Listen for the web server to make a ZeroMQ push after an ajax request
$context = new React\ZMQ\Context($loop);
$pull = $context->getSocket(ZMQ::SOCKET_PULL);
$pull->bind('tcp://127.0.0.1:5555'); // Binding to 127.0.0.1 means
// the only client that can connect
// is itself
$pull->on('message', array($pusher, 'onMessage'));
// Set up our WebSocket server for clients wanting real-time updates
$webSock = new React\Socket\Server('0.0.0.0:8080', $loop);
/*
$webSock->listen(8080, '0.0.0.0'); // Binding to 0.0.0.0 means
// remotes can connect
*/
$webServer = new Ratchet\Server\IoServer(
new Ratchet\Http\HttpServer(
new Ratchet\WebSocket\WsServer(
new Ratchet\Wamp\WampServer(
$pusher
)
)
),
$webSock
);
$loop->run();
I commented the $webSock->listen() line because it was throwing an error and in a git issue someone has commented that this was because an update in the react/zmq library, so that is the only line different to the tutorial.
controller.php
public function post()
{
$entryData = array(
'category' => 'kittensCategory',
'title' => 'Title'
);
$context = new ZMQContext();
$socket = $context->getSocket(ZMQ::SOCKET_PUSH, 'my pusher');
$socket->connect("tcp://localhost:5555");
$socket->send(json_encode($entryData));
}
This is the function that I'm calling and that should push a message to my pusher class but it does nothing.
I don't know what's the problem, my client is connecting correctly and the pusher is working good in the subscription method, so it has to be something in the push or the pull.
I have been trying to solve this for 2 weeks now but I don't have a clue, any comment would be awesome, thanks.