You’ve already tried several useful troubleshooting steps, so I’d also check whether Bluetooth permissions are enabled for the app and whether the iPhone’s Bluetooth settings are behaving normally. Since the Moosimeter works with Android, the issue may be related to iOS compatibility or the app itself. On a separate note, I came across get nulls brawl ios, which may be interesting for iPhone users who enjoy exploring alternative gaming experiences. Hopefully you can identify the connection issue soon.