Go to your devices in the Telldus app. Note that the feature only works for you as a premium user with iOS. Click on the specific device that you want to add as a Siri shortcut. Go to “settings”. Click on “manage Siri setting”. Select when you want the device to go on, for example. Click on “add shortcut to Siri”. Name the shortcut and click on "Add to Siri". Repeat step 5–7 and select when you want the device to go off, for example. Open the "Shortcuts" app on your iOS device. Click on the symbol with the three dots on the shortcut you just created. Optional: Disable "Show while driving". Optional: Click on the symbol with the three dots to; a) Rename the shortcut. b) Enable display on an Apple Watch. c) Add the shortcut to your home screen. Done!
Now you can use the shortcut by tapping the icon via the home screen or via the Siri voice command from your iPhone, iPad or Apple Watch.