With all of the discussion over on the thread for the beta release of your MP3 Event Player, I realized I haven't checked in on the state of things with regards to getting Ule's Media Renderer working on Hubitat.
I didn't reply previously to the question of contributing - but yes, I would chip in some bucks towards this.
I just tried firing up the Media Renderer Connect app on my Hubitat and it gets further than before. I can start a search for a DLNA device, but it never finds either of my DLNA speakers that work fine in ST.
I will take a look again through the Media Renderer Connect code to see what I can figure out.