Minimum Viable Product (MVP) is a product with just enough features to satisfy first customers and to provide feedback for future development. Simplifying the basic architecture even more, it will get to bellow MVP architecture.

Smart house – MVP architecture

Web interface to control smart plugs

Sonoff S20 smart plug with custom open source software

I am preparing few devices (3-5 smart plugs/smart plug extensions) and share them for free for one month to get feedback and see how viable the solution is.