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In-wall light switch recommendations
(lemmy.world)
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
They work like regular switches. The flip of the physical switch sends the change back to home assistant to keep everything synchronicity.
I don't have any, though, so I'm not sure if you can set it to "up is always on", or if it ends up being a switch, so "whichever direction just changes the on/off state"