Saved my bacon
The app I got with my BT receiver/door opener disappeared from the App Store. This app works with my device, so I didn’t have to toss my hardware. It’s not what you would call a full-featured app, however. It does not read and report the state of the switch that indicates whether the door is opened or closed, as the original app did, so I can no longer check to see if I closed the door. But at least I can still open and close the door.