How many components does it take to turn on a light switch?

What country are you in? The device selection does vary.

Meanwhile, it sounds like Shelly might be an option for you. They are available in many countries. They have their own local server if you want to use that or you can use their Wi-Fi cloud, and with the new smartthings architecture you can communicate with them through an edge driver. So lots of options. Inexpensive and quite well engineered for the price.

Edge Shelly drivers for Gen1 and Gen2 Devices

If you haven’t heard of Edge yet, you can start with this. With your technical background, I think you might find it quite interesting. :sunglasses: