public function sendSetPrivacySettings($category, $value)
    {
        $msgId = $this->createIqId();
        $categoryNode = new ProtocolNode('category',
            [
                'name'  => $category,
                'value' => $value,
            ], null, null);

        $privacyNode = new ProtocolNode('privacy', null, [$categoryNode], null);
        $node = new ProtocolNode('iq',
            [
                'to'    => Constants::WHATSAPP_SERVER,
                'type'  => 'set',
                'id'    => $msgId,
                'xmlns' => 'privacy',
            ], [$privacyNode], null);

        $this->sendNode($node);
    }