I’m guessing @JDRoberts tagged me since one approach would be to use an Android device with Tasker as a sort of man in the middle.
Rather than trying to reverse engineer the Bluetooth protocol FirstBuild has used, you could use Tasker with the plugin AutoInput to automate controlling the Android app or even query the app UI for current state. The integration point with SmartThings would be done via SharpTools is a set of Tasker plugins I developed.