/**
  * Callback when a client connects
  *
  * @param \WebSocketServer\Event\Event   $event  The event
  * @param \WebSocketServer\Socket\Client $client The client
  */
 public function onClientConnect(Event $event, Client $client)
 {
     // $client->on('cryptoenabled', ...);
     $client->on('handshake', [$this, 'onHandshake']);
     // $client->on('frame', ...);
     $client->on('message', [$this, 'onMessage']);
     $client->on('disconnect', [$this, 'onDisconnect']);
     $client->on('error', [$this, 'onError']);
 }