Hi @hobby78 I have created a beta for your chromecast audio with BubbleUPnP server, This connect works if the uuid does not change, the ip and port are updated automatically every sync.
I have program with this considerations
1.- The uuid remains all time
2.- The port and ip can be changed by the server
You must to uninstall all your speakers (from smarthings) and install them again.
send me your feedback
Just update the MediaRenderer Connect with this version