Book Image

Developing IoT Projects with ESP32

By : Vedat Ozan Oner
Book Image

Developing IoT Projects with ESP32

By: Vedat Ozan Oner

Overview of this book

Developing IoT Projects with ESP32 provides end-to-end coverage of secure data communication techniques from sensors to cloud platforms that will help you to develop production-grade IoT solutions by using the ESP32 SoC. You'll learn how to employ ESP32 in your IoT projects by interfacing with different sensors and actuators using different types of serial protocols. This book will show you how some projects require immediate output for end-users, and cover different display technologies as well as examples of driving different types of displays. The book features a dedicated chapter on cybersecurity packed with hands-on examples. As you progress, you'll get to grips with BLE technologies and BLE mesh networking and work on a complete smart home project where all nodes communicate over a BLE mesh. Later chapters will show you how IoT requires cloud connectivity most of the time and remote access to smart devices. You'll also see how cloud platforms and third-party integrations enable endless possibilities for your end-users, such as insights with big data analytics and predictive maintenance to minimize costs. By the end of this book, you'll have developed the skills you need to start using ESP32 in your next wireless IoT project and meet the project's requirements by building effective, efficient, and secure solutions.
Table of Contents (18 chapters)
1
Section 1: Using ESP32
7
Section 2: Local Network Communication
12
Section 3: Cloud Communication

Using Wi-Fi

Nodes in a Wi-Fi network form a star topology, which means a central hub exists and other nodes connect to the central hub to communicate within the Wi-Fi network or with the outside world if the central hub is connected to a router or is itself a router. Therefore, we see two different modes of operation in a Wi-Fi network:

  • Station (STA) mode
  • Access point (AP) mode

We can configure ESP32 in both modes. In STA mode, ESP32 can connect to an access point and join a Wi-Fi network as a node. When it is in AP mode, other Wi-Fi-capable devices, such as mobile phones, can connect to the Wi-Fi network that ESP32 starts as the access point. The following figure shows both cases with two different Wi-Fi networks:

Figure 6.1 – ESP32 in STA mode and AP mode

Let's start with an example of STA mode.

STA mode

In this example, we will configure ESP32 in STA mode to connect to a local Wi-Fi network and send a GET request...