public function sendHello() {

        $helloXML = new SimpleXMLElement("<capabilities> </capabilities>");

        foreach ($this->myCapabilities as $capability) {

            $helloXML->addChild("capability", $capability);

        }

        $this->sendRaw(
            $helloXML->asXML(),
            "hello",
            null,
            [],
            false
        );

    }