Preface

MQTT is the preferred IoT publish-subscribe lightweight messaging protocol. If you develop IoT, web applications, mobile apps, or a combination of these solutions, you must learn how MQTT and its lightweight messaging system work. Of course, it is extremely important to take security into account when working with this protocol.

Most of the times, when you work with IoT solutions, you won’t be using a single programming language. Instead, you will use a combination of different programming languages and code running on different IoT boards that might use diverse operating systems. MQTT has its own specific vocabulary and different working modes. Learning MQTT is challenging because it includes too many abstract concepts that require real-life examples to be easy to understand.

This book will allow you to dive deep into the latest version of the MQTT protocol: 3.1.1. You will learn to work with Mosquitto MQTT server, command-line tools, and GUI tools to allow you to understand how everything works with MQTT and the possibilities that this protocol provides for your projects. You will learn security best practices and you will use them for a Mosquitto MQTT server.

This book will provide you with examples in the following programming languages, which are extremely popular in IoT, web applications, and mobile apps: Python, Java, HTML 5, JavaScript, Node.js, and Swift 3. You will control a drone, interact with sensors, control home automation, and interact with actuators by exchanging MQTT messages with the different programming languages and client libraries.

You will be able to run the examples on a wide range of modern IoT boards, such as Raspberry Pi 3, Raspberry Pi 2 Model B, Raspberry Pi Zero, Intel Joule, Intel Edison, and Intel Galileo Gen 2. However, any other board that supports the programming languages explained in the book will be able to run the samples.