Updating for 2020. I have the ZL 7432 Vision in-wall z-wave dual relay and had similar problems getting it set up with the SmartThings V3 hub and the Samsung SmartThings (new) mobile app. All of the linked code didn’t work for me with the new app. Steps I followed to get it working properly:
- Add it in the app as a “Generic Z-Wave device” (flip the switch on/off four times to put into pairing mode)
- Go to https://graph.api.smartthings.com/
- Go to
My Devices
- Click the device you created in step one above
- Go to
Edit
at the bottom - Under
Type
pickZ-Wave Dual Switch
and hit save - Restart the SmartThings mobile app. You should see a new second switch at the bottom which you can move into the same room as the first switch. Try both and they work!