Popular DIY Mini-Split system with built in remote management (cloud service). There is a long running thread asking for this integration as well as tutorials for getting this to work through ESPHome and other third party climate controllers. Native support would be fantastic.
In doing some searching I found @houseofbugs put together a really nice write up on leveraging ESPhome to control his MrCool. I ordered the USB Adapter and going to give it a shot!