i use a Dragonfly from Lunatico, it drives relays over the web and also has 8 inputs that i use to know the status of my power supplies and the roof, it drives relays that control from 12v to 240v..... one of them to power on the computer, another for focuser, heaters, mount, roof open and close, etc
they also have a mobile app to control it and the unit logs in on the cloud so it is easy to connect remotely to it.
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