So it looks like you got into an unfortunate problem with networking or smth like that, I’ve never seen an RTSP error, so it was probably something with your firewall or possibly your PC’s firewall decided to block VIM from connecting to moonlight. If you’re using the latest version, this is the last thing I did before dropping the video part as there are no more simple changes to be done.
This embedded client sends every built frame to the amlogic decoder as-is. There are no mechanisms to drop a frame in order to reduce latency or anything like that. On my S905D system though, 60 fps was working but it does drop frames sometimes. It’s not designed for e-sports titles or anything like that. I didn’t do any back-to-back testing with my other system to see how the latency compares with the latest versions. Try switching between h264 and h265 and see what works best for you. H265 should work better.