If you own a Garmin smartwatch like Vivoactive or Fenix then there is a new widget to control your devices via REST HTTP Call. It’s simply called IOT Client Widget.
I’m using it to toggle some of my lights at home. It’s not as comfortable as using Siri (heavy hint to my plugin pimatic-hap 
), but it works pretty decent. And some of us still use an Android phone 
.
This is how it looks like:
To configure it to use pimatic, you just set the right URLs like
http://username:password@mypimatic/api/device/light_switch/toggle
This will toggle the device with id light_switch. For the actions that a device supports see the api description. If you are using the authentication feature in pimatic you also have to set the username and password in the URL. Unfortunately as plain text. AFAIK pimatic doesn’t support auth tokens or anything like that.