import * as React from 'react'; import { StyleSheet, View, Text } from 'react-native'; import RNMethodModule,{DYGlucoseDriver} from 'react-native-bt-device'; export default function App() { // const [result, setResult] = React.useState(); React.useEffect( () => { RNMethodModule.connectSingleDevice('abc') DYGlucoseDriver.startMonitor('abc') // multiply(3, 7).then(setResult); }, []); return ( Result: {} ); } const styles = StyleSheet.create({ container: { flex: 1, alignItems: 'center', justifyContent: 'center', }, box: { width: 60, height: 60, marginVertical: 20, }, });