The Internet of Things (IoT) has revolutionized the way devices communicate, and the MQTT (Message Queuing Telemetry Transport) protocol is one of the most popular and efficient ways to make this communication happen. In this tutorial, we’ll connect an ESP32 to the internet via WiFi and make it periodically send data to a public MQTT broker, allowing you to view this information in real-time both in the browser and in an Android app. ...
The need to store data in the cloud is a fundamental pillar of Internet of Things (IoT) projects. Whether for logging sensor readings, monitoring a device’s state, or creating event logs, having an accessible and scalable database is essential. The ESP32, in its various versions, combined with Google’s Firebase Firestore, forms a powerful and accessible duo for developers and hobbyists alike. In this technical tutorial, we will explore the most lightweight and universal method for sending data from an ESP32 to Firestore: using the native REST API. Instead of relying on heavy Firebase libraries, we will build HTTP requests from scratch. This approach not only saves precious memory and resources on the microcontroller but also deepens the understanding of how web APIs work. ...