Came across this in my travels - I don’t know if the author - Carlos Lumbreras Sádaba, is a community member here? It’s an interesting read.
https://academica-e.unavarra.es/handle/2454/39091
The use of these assistants with an openHAB server has allowed the development of a very
interesting system. The openHAB server acts as an intermediate platform between voice
assistants and intelligent devices. This makes possible to create a system that allows to control
all these devices of the home by voice.