What operating system are you using on the RPi’s ?
The new improved Riopeee didn’t support DLNA .
@spockfish has just released the XL version on his new platform which should support DLNA, I have yet to load it on my pi4 so I can’t comment/test .
I am not seeing my RPi on the non XL version on JRemote, JRiver GUI or mConnect . I would expect that ?
I’ll try to get around to burning the XL version soon and comment . I have been using v.29 since the first releases with no issues. It’s now officially “stable” as of build 209.0.30 (maybe earlier)