Thanks @aonghusmor - your DHT is working nicely with my QBKG03LM (Aquara Wired Wall Switch Dual Button no neutral) on the SmartThings Classic app.
I have both buttons wired to the mains and initially had trouble binding the individual buttons to virtual switches so that I could use them with routines and Alexa. I tried both the Kudled and Advancrd Button Controller SmartApps wiothout any luck (probably user error) but eventually got it working with the Virtual Device Sync SmartApp thanks to @erocm1231 that comes with it’s own “Simulated Device” Device Handler:
Thanks to you (and other contributors) for the effort
Dave