volumeStateXml static method
Implementation
static String volumeStateXml() {
return '''<?xml version='1.0' encoding='utf-8' standalone='yes' ?>
<s:Envelope s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Body>
<u:GetVolume xmlns:u="urn:schemas-upnp-org:service:RenderingControl:1">
<InstanceID>0</InstanceID>
<Channel>Master</Channel>
</u:GetVolume>
</s:Body>
</s:Envelope>''';
}