how to fixing:
error{"nativeStackAndroid":[],"userInfo":null,"message":"NOT_STARTED","code":"DISCOVER"} on android 10+
open rootproject/node_modules/react-native-bluetooth-escpos-printer/android/src/main/RNBluetoothManagerModule.java
and change ACCESS_COARSE_LOCATION
into ACCESS_FINE_LOCATION
dont forget make sure on your AndroidManifest.java has permission ACCESS_FINE_LOCATION
and then run ./gradlew clean on rootproject/android and react-native-run-android
hope this will help !
React Native Bluetooth Escpos Printer error NOT STARTED
By. Agung Riyanto [apadevteam]