Thank you for your response.
After a long absence from hifi systems I am setting up my quite old gear in my partner's house. I set up a two channel system based around audio. And in another room I hope to have a multichannel system with a video component. I bought the Wiim Ultra and for the time being I have installed it in the latter with a wired connection through a Denon AVR.
Until I get the multi channel and audio setup I am primarily listening to audio streamed through the Ultra. I thought I might be able to stream to the two channel room with one of the several components I have got on a network. I can connect an old Cocktail Audio X30 to the same network as the Ultra but can't see it via the Ultra. I tried also with the AVR without success.
Basically what I'm asking is should this be possible with the Ultra. If not I may just purchase a Wiim Mini and use that to achieve my purpose. Unfortuately the other components I could use in the audio room don't have Bluetooth so that is not an option at this stage.
Your comment about a common protocol has given me something I can check.
Thank you, Jeff