Book Image

Internet of Things from Scratch

By : Renaldi Gondosubroto
Book Image

Internet of Things from Scratch

By: Renaldi Gondosubroto

Overview of this book

Develop the skills essential for building Internet of Things solutions with this indispensable guide. In an era where industries heavily rely on IoT, this book will quickly familiarize you with its foundations, widespread use, implementation guided by best practices, and the crucial technologies that allow it to work effectively. Starting with the use of IoT in real-life scenarios, this book offers comprehensive insights into basic IoT hardware, protocols, and technologies. You’ll then learn about architecting and implementing solutions such as wireless sensor networks, cloud computing with AWS, and crucial security considerations. You’ll understand how these systems are operated and monitored over time and work with simple to complex, industry-grade systems, adhering to best practices. In later chapters, you’ll be apprised of future IoT trends and strategies to manage the risks and opportunities that come with them. You’ll also get to grips with a diverse set of tools, including hardware such as ESP32 and Raspberry Pi, and software such as Mosquitto and ChatGPT for generative AI capabilities. By the end of this IoT book, you’ll be able to independently build and design complex, industry-standard solutions fully aligned with best practices.
Table of Contents (22 chapters)
1
Part 1: Getting Started with the Internet of Things
6
Part 2: Developing and Optimizing IoT Systems for Smart Environments
11
Part 3: Operating, Maintaining, and Securing IoT Networks
16
Part 4: Delving into Complex Systems and the Future of IoT

Practical – creating an MQTT pub and sub communication between an ESP32 and a Raspberry Pi

One of the best ways to see MQTT in action is to create a pub/sub model based on communication between two devices. In this case, we will be using the ESP32 and the Raspberry Pi, where the ESP32 will serve as the publisher and subscriber while the Pi serves as the MQTT broker. Here is a breakdown of the roles of all three in this practical:

  • Publisher: The ESP32 publishes messages to the MQTT broker. It sends messages to the /topic/test1 topic when there is user input from the serial monitor, and it also periodically sends Hello World messages to the /topic/test3 topic every 15 seconds.
  • Subscriber: The ESP32 is also a subscriber, as it listens for messages on the /topic/test1 and /topic/test2 topics. When it receives a message on one of these topics, it processes the message in the callback function, which in this case prints the received message to the Serial Monitor.
  • Broker...