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

IoT protocols with ESP32

There are a number of application layer protocols for IoT devices to communicate with remote servers. Their design principles and architectures are quite different, so it is really a matter of requirements and constraints which one to choose in an IoT project. Let's discuss some popular protocols and their features with examples.

MQTT

Message Queue Telemetry Transport (MQTT) is a many-to-many communication protocol with a message broker as the mediator. There are publishers that send messages to the topics on the broker, and there are subscribers that receive messages from the topics that they have subscribed to. A node can be a publisher and subscriber at the same time:

Figure 10.1 – MQTT communication model

For MQTT, TCP is the underlying transport protocol and TLS can be configured for communication security.

Let's see how MQTT works with a simple example. We will develop a sensor device with DHT11...