I dig quickly into that some time ago, I came to the conclusion that IoT is everything but simple.
Most of the time, you’ll have to set up your own private IoT server.
Some articles I found interesting:
- about protocols: A Complete Guide to IoT Protocols & Standards In 2021 and https://techvidvan.com/tutorials/iot-protocols/
- about home solutions: How to build your own smart home hub with a Raspberry Pi and the WebThings Gateway or How to build your own powerful smart home server and hub » The smarthome journey
So, I’ll say: at first you may gather intel about your devices, from manufacturer or Internet resources …