I’ve been researching for my house plant watering system and had my eye on the ETH relay control board, but did not know if it was reprogram able. It is, Very cool. And it look simpler then a esp2866 with a MCP230xx port expander for 16 relays. And wifi for the location of the project is iffy. ETH is better in my case.
Thanks for the your system setup examples, and the controller info. More ideas to work with for my W.I.P.