public function sendGetServerProperties()
    {
        $id = $this->createIqId();
        $child = new ProtocolNode('props', null, null, null);
        $node = new ProtocolNode('iq',
            [
                'id'    => $id,
                'type'  => 'get',
                'xmlns' => 'w',
                'to'    => Constants::WHATSAPP_SERVER,
            ], [$child], null);

        $this->sendNode($node);
    }