I've just released what I think is a stable version of a Esp32-S3 based serial bridge for the Retrotink4K. This is separate from the recently released "Retro-Bridge". The biggest difference right now between our projects is mine is fully local and open source, theirs has much more advanced controls. I'm hoping once they release their specifications I can update my project to act as an interface for their tools.

If you have a esp32-s3 devkitc and a retrotink 4k, I would love to have some feedback.