React Native Bluetooth Classic
Connect to Bluetooth Classic devices on Android and IOS within your React Native app
While developing Standardbred Canada mobile application I was required to write (well I guess I could have not used React Native) a plugin that provided Bluetooth Classic functionality to both Android and IOS. There were numerous plugins for Android, but most of them fell back to BLE for their IOS implementations. Starting with the great base of React Native Bluetooth Serial I was able to get External Accessory up and running for IOS.
Check out the project docs.