Here is the link to the code for the on/off switch that should work with the new app simlar to the dimmer I posted above.
I will also mention what I’ve mentioned with other code updates- with Smartthings the future of Groovy coding and the IDE remain up in the air, and the Groovy IDE is set to be phased out at some point in the next year. That being said, I don’t know what the future will hold, if this code will work on the new platform, or if I’ll be on Smartthings still/able to update it in the future. Hopefully this at least buys you more time until then and Smartthings handles the transition better then they handled to phaseout of the classic app.