Commands and setting that I did for setup.
re-natal init reNatalEsp32controlApp
cd re-natal-esp32-control-app
npm install --save react-native-ble-manager
re-natal use-component react-native-ble-manager
re-natal use-component moment
re-natal use-android-device real
re-natal use-figwheel
rect-native link
Added the followind info to android/app/src/main/AndroidManifest.xml
to activate BLE on android.
<manifest
..
xmlns:tools="http://schemas.android.com/tools">
<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<uses-feature android:name="android.hardware.bluetooth_le" android:required="true"/>
<uses-sdk
..
tools:overrideLibrary="it.innove" />
</manifest>