I noticed yesterday the support article re linking SmartThings to your IHD so gave it a try. Other than it said nothing paired it seems to have connected but the data seems suspect not agreeing with the IHD and clicking on the gas meter reading makes the app restart.
Also as the IHD keeps loosing connection (for electric, every 30 min gas readings seem to keep being received).
Still it is only Version 1
Electric data stopped so rebooted display to restore.