export default function App() { MQTT.createClient({ uri: 'mqtt://test.mosquitto.org:1883', clientId: 'id1', //tls: false }).then(function(client) { client.on('closed', function() { console.log('mqtt.event.closed'); }); client.on('error', function(msg) { console.log('mqtt.event.error', msg); }); client.on('message', function(msg) { console.log('mqtt.event.message', msg); }); client.on('connect', function() { console.log('connected --------------------------->'); client.subscribe('/data', 0); client.publish('/data', "test", 0, false); }); client.connect(); }).catch(function(err){ console.log(err); }); return ( <View style={styles.container}> <Text>Hello World!!!!</Text> <StatusBar style="auto" /> </View> ); } const styles = StyleSheet.create({ container: { flex: 1, backgroundColor: '#fff', alignItems: 'center', justifyContent: 'center', }, });

Importé MQTT de esta manera:

 import MQTT from 'sp-react-native-mqtt';

Esta biblioteca debería ser para reaccionar nativo y copié el código de https://npmjs.com/package/sp-react-native-mqtt