Thanks Denis! Your comment in 401 in REST API Even With New Account helped me generate a perpetual API token that I hardcoded into the SmartThings SmartApp, and now i have Garadget up and running in SmartThings and in the Garadget app. Best of both worlds. I will PR or fork the fuzzysb github repo and document what I did to hardcode a token.
Ideally when my time allows I’ll implement the oauth flow but for now I’m a happy camper. Great product, very easy to install.