Book Image

MQTT Essentials - A Lightweight IoT Protocol

5 (1)
Book Image

MQTT Essentials - A Lightweight IoT Protocol

5 (1)

Overview of this book

This step-by-step guide will help you gain a deep understanding of the lightweight MQTT protocol. We’ll begin with the specific vocabulary of MQTT and its working modes, followed by installing a Mosquitto MQTT broker. Then, you will use best practices to secure the MQTT Mosquitto broker to ensure that only authorized clients are able to publish and receive messages. Once you have secured the broker with the appropriate configuration, you will develop a solution that controls a drone with Python. Further on, you will use Python on a Raspberry Pi 3 board to process commands and Python on Intel Boards (Joule, Edison and Galileo). You will then connect to the MQTT broker, subscribe to topics, send messages, and receive messages in Python. You will also develop a solution that interacts with sensors in Java by working with MQTT messages. Moving forward, you will work with an asynchronous API with callbacks to make the sensors interact with MQTT messages. Following the same process, you will develop an iOS app with Swift 3, build a website that uses WebSockets to connect to the MQTT broker, and control home automation devices with HTML5, JavaScript code, Node.js and MQTT messages
Table of Contents (16 chapters)
MQTT Essentials - A Lightweight IoT Protocol
Credits
About the Author
Acknowledgment
About the Reviewer
www.PacktPub.com
Customer Feedback
Dedication
Preface

Summary


In this chapter, we started our journey toward understanding the MQTT protocol. We understood convenient scenarios for this protocol, the details of the publish/subscribe pattern and message filtering. We learned basic concepts related to MQTT and understood the different components: clients, brokers and connections.

We learned to install a Mosquitto broker or server on Linux, macOS and Windows. We used the default configuration to learn how everything works under the hoods while using Mosquitto. This way, it will be easier for us to use the client libraries in different programming languages to publish MQTT messages and subscribe to MQTT topic filters.

We learned best practices related to topics, single level and multi level wildcards. We studied in detail the different Quality of Service levels supported by MQTT and when it is convenient to use each of them. We analyzed their advantages and disadvantages.

Now that we understood how the MQTT basics work, we will learn how to secure an MQTT server and to follow best practices related to security, which is what we are going to discuss in the next chapter.