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MQTT Essentials - A Lightweight IoT Protocol

MQTT Essentials - A Lightweight IoT Protocol

By : Gaston C. Hillar
4.1 (7)
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MQTT Essentials - A Lightweight IoT Protocol

MQTT Essentials - A Lightweight IoT Protocol

4.1 (7)
By: Gaston C. Hillar
Buy this Book

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 (8 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
Free Chapter
1
1. Lightweight Messaging with MQTT 3.1.1 and Mosquitto
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1. Lightweight Messaging with MQTT 3.1.1 and Mosquitto
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Understanding convenient scenarios for the MQTT protocol
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Working with the publish-subscribe pattern
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Working with message filtering
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Understanding the MQTT puzzle -- clients, servers, and connections
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Installing a Mosquitto broker on Ubuntu Linux
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Installing a Mosquitto broker on macOS
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Installing a Mosquitto broker on Windows
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Subscribing to topics
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Publishing messages
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Unsubscribing from topics
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Working with best practices when creating topics
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Understanding wildcards
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Learning about the different Quality of Service levels
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Working with at least once delivery
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Working with exactly once delivery
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Test your knowledge
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Summary
2
2. Securing an MQTT Mosquitto Server
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2. Securing an MQTT Mosquitto Server
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Securing a Mosquitto server
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Generating a private certificate authority to use TLS with Mosquitto
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Creating a certificate for the Mosquitto server
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Configuring TLS transport security in Mosquitto
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Testing the MQTT TLS configuration with MQTT.fx
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Testing the MQTT TLS configuration with MQTT-spy
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Creating a certificate for each MQTT client
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Configuring TLS client certificate authentication in Mosquitto
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Testing the MQTT TLS client authentication with MQTT.fx
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Testing the MQTT TLS configuration with MQTT-spy
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Forcing the TLS protocol version
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Test your knowledge
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Summary
3
3. Controlling a Drone with Python
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3. Controlling a Drone with Python
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Understanding the requirements to control a drone with MQTT
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Defining the topics and commands
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Installing paho-mqtt for Python
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Connecting the client to the MQTT server with Python
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Understanding callbacks
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Subscribing to topics with Python
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Creating a class to represent a drone
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Receiving messages with Python
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Processing commands with Python
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Sending messages with Python
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Working with the network loop with Python
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Test your knowledge
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Summary
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4. Interacting with Sensors in Java
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4. Interacting with Sensors in Java
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Understanding the requirements
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Defining the topics and commands
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Installing the Eclipse Paho Java Client
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Creating a security helper class to establish a TLS secured connection
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Configuring a TLS secured connection in Java
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Working with asynchronous notifications and callbacks in Java
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Subscribing to topics and understanding notification events in Java
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Processing commands that interact with sensors in Java
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Working with last will and testament in Java
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Publishing messages with commands to target sensors
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Test your knowledge
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Summary
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5. Controlling Home Automation in JavaScript
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5. Controlling Home Automation in JavaScript
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Understanding the requirements
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Defining the topics and commands to control home automation
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Enabling WebSockets for a Mosquitto server
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Testing WebSockets with the Eclipse Paho client JavaScript utility
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Understanding the Eclipse Paho JavaScript asynchronous client
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Creating an HTML 5 web page to control LEDs
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Publishing messages to target remote devices in JavaScript
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Processing the received messages in JavaScript
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Working with WebSockets to connect to the MQTT server
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Subscribing to topics in JavaScript
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Processing commands that interact with LEDs in Node.js
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Running the home automation web application
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Debugging asynchronous code with Chrome Developer Tools (CDT) in JavaScript
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Securing MQTT over WebSockets with TLS
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Test your knowledge
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Summary
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6. Interacting with Actuators in Swift
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6. Interacting with Actuators in Swift
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Understanding the requirements
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Defining topics and commands
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Enabling connections without TLS for a Mosquitto server
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Installing the CocoaMQTT client library to create a new iOS app
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Building the UI for the iOS app that will control an actuator
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Understanding the CocoaMQTT client in Swift 3
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Connecting to the MQTT server and subscribing to topics in Swift
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Publishing messages to target actuators in Swift
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Processing commands that interact with actuators in Node.js
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Running the iOS app that controls an actuator with MQTT
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Debugging events in Swift
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Test your knowledge
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Summary
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A. Exersise Answers
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Chapter 1, Lightweight Messaging with MQTT 3.1.1 and Mosquitto
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Chapter 2, Securing an MQTT Mosquitto Server
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Chapter 3, Controlling a Drone with Python
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Chapter 4, Interacting with Sensors in Java
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Chapter 5, Controlling Home Automation in JavaScript
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Chapter 6, Interacting with Actuators in Swift

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.

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