I found this post from 2019:
My custom installation at home includes all the standard functionality plus ~10 remote units, mostly ESP-based, for RGB lights, fan relays, temp/humi sensors and water pump. All talk MQTT over WiFi. The CPU is usually about 5% with a desktop running on the LCD with spikes to 80% on the LCD presses.
…and notice a reference to a nonhab version with just the minimum for remote MQTT control. I looked through git and didn’t see a branch or other repository for this. Is there code (even alpha stuff) that’s been published out there I could look at, or help with?
Hello, this was maintained by a user and is not on our githhub. Look through the forum to find the link to download. Boot process in 2009 was long. These days it is about 10min.
If you’re okay with ZMQ+protobuf (or writing MQTT support in C yourself), you could try FreeAbode:
GitHub - freeabode/freeabode: Home automation software