This is a simple example of using the Paho MQTT Javascript library to connect to a broker and receive and send data to a topic on that broker.
This is a lot simpler than the main app I am developing and explains how to use the library a lot better.
You can find the code used in this tutorial here:
https://github.com/rendermaniac/paho-...
You may need to run npm install to install the libraries.
These are the tools used in this tutorial:
Paho Github https://github.com/eclipse/paho.mqtt....
Expo React Native framework https://expo.dev/
Expo Go dev app https://expo.dev/expo-go
HiveMQ https://www.hivemq.com/public-mqtt-br...
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