I'm pretty sure from searching this site that Hubitiat has no way to integrate into an iWatch and have a rule run from pressing a "complication" on the iWatch main screen.
Ex Smarthings user...now Homeseer...but looking for a tighter integration between vendors.
Currently, I have a shortcut built that will take me to Alexa voice control from a complication...but what I want is simply a button on the top screen of my iWatch I can touch, and it launches a rule/event/routine.
I'll have to dig into this a bit since things like maker API are things I'm unaware of at this point. But THANKS...Knowing it can be done give me a starting point. I will admit I'm not looking forward to moving over something like 300 rules and almost 600 "devices."
Search for posts about Apple Watch. I use a dashboard and shortcut to control the devices. If you can’t find anything, let me know and I will try to help.