Ratchet.php

<?php
use Ratchet\Server\IoServer;
use Ratchet\Http\HttpServer;
use Ratchet\WebSocket\WsServer;

class Ratchet extends CI_Controller
{
  public function start()
  {
    IoServer::factory(
      new HttpServer(
        new WsServer(
          new RatchetHandler($this)
        )
      ),
      8888
    )->run();
  }
}