Summary

This chapter was solely dedicated to the ESP development boards that we will be using throughout this book, even in the full-scale projects that we will be creating in the upcoming chapters. First, we covered the NodeMCU development board, including its technical specifications, and its GPIO configuration, before learning how to set up the Arduino IDE for this board and flashing our very first program. Next, we covered the same topics for the ESP32 development board, which is often considered a successor of the latter with some additional features. Finally, we built our very first mini-project. We turned our NodeMCU board into an MQTT client and controlled its onboard LED wirelessly using the MQTT communication protocol.

In the next chapter, we will look at another important component that will be very useful later in this book when we cover two full projects: Node-RED.

We will use this to create dashboards for our projects and learn how we can store the received MQTT...