Did you know properly designed IoT devices on sale? Personally I have some IoT at home to automate the home itself especially for p.v. self-consumption and the best I was able to find and integrate can be described as crap... I failed to fined anything else...
A simple example: I like to have some electricity switch/breakers automation, the best I've found are from Shelly Pro series, witch have a not really useful webserver built-in and not really useful APIs the rest are even worse having no wired versions at all. Why the hell not offer manual breaker + two wires for modbus so I do not need to fit ethernet wires and power in the same place?
Why just finding classic ModBUS-tcp/MQTT wired devices is so hard?
Things meant to be integrated does not need shiny UIs, need effective ways to integrate them, simple and reliable coms. My VMC witch is not a dirty cheap device have mobus support, unfortunately even the vendor do not know a full list of all registry and many of them does works "sometimes" like "write a 1 to switch from heating to passive ventilation", "sometimes works", so to integrate it I need to check if the command was "accepted" after 30" then re-check it after 40 because sometimes it flip back for unknown reasons... And the list is long...
There aren't very many unfortunately, but hopefully Matter will change that (I haven't looked into the protocol in detail tbh - been out of the IoT world for a while).
MQTT is not a good solution. It's a very ad-hoc protocol that really only works if you are a programmer setting up a completely custom system. Obviously manufacturers are not going to cater to that miniscule market.
A simple example: I like to have some electricity switch/breakers automation, the best I've found are from Shelly Pro series, witch have a not really useful webserver built-in and not really useful APIs the rest are even worse having no wired versions at all. Why the hell not offer manual breaker + two wires for modbus so I do not need to fit ethernet wires and power in the same place?
Why just finding classic ModBUS-tcp/MQTT wired devices is so hard?
Things meant to be integrated does not need shiny UIs, need effective ways to integrate them, simple and reliable coms. My VMC witch is not a dirty cheap device have mobus support, unfortunately even the vendor do not know a full list of all registry and many of them does works "sometimes" like "write a 1 to switch from heating to passive ventilation", "sometimes works", so to integrate it I need to check if the command was "accepted" after 30" then re-check it after 40 because sometimes it flip back for unknown reasons... And the list is long...