Through which data interface can you control your smart home from your phone?

Question

User interface

There is a phone with a mobile application and, say, a microwave oven. What interface is used for this? It would be interesting to hear a detailed answer.

Answer 1

Тот который поддерживает микроволновка, какой решит использовать производитель или тот кто захочит сделать эту микроволновку умной. Открытое поле для фантазий.

Answer 2

In the case of a microwave, most likely, a simple http server is used on the side of the stove, returning / accepting statuses / commands sent by specialized software on the side of the phone. The connection type can be either Wi-Fi or Bluetooth.