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Hands-On Internet of Things with MQTT

By : Tim Pulver

3.2 (5)

Hands-On Internet of Things with MQTT

3.2 (5)

By: Tim Pulver

Overview of this book

MQ Telemetry Transport (MQTT) is a lightweight messaging protocol for smart devices that can be used to build exciting, highly scalable Internet of Things (IoT) projects. This book will get you started with a quick introduction to the concepts of IoT and MQTT and explain how the latter can help you build your own internet-connected prototypes. As you advance, you’ll gain insights into how microcontrollers communicate, and you'll get to grips with the different messaging protocols and techniques involved. Once you are well-versed with the essential concepts, you’ll be able to put what you’ve learned into practice by building three projects from scratch, including an automatic pet food dispenser and a smart e-ink to-do display. You’ll also discover how to present your own prototypes professionally. In addition to this, you'll learn how to use technologies from third-party web service providers, along with other rapid prototyping technologies, such as laser cutting, 3D printing, and PCB production. By the end of this book, you’ll have gained hands-on experience in using MQTT to build your own IoT prototypes.

Title Page

Title Page

Copyright and Credits

Copyright and Credits

Hands-On Internet of Things with MQTT

About Packt

About Packt

Why subscribe?

Contributors

Contributors

About the author

About the reviewer

Packt is searching for authors like you

Preface

Preface

Who this book is for

What this book covers

To get the most out of this book

Get in touch

Free Chapter

The Internet of Things in a Nutshell

The Internet of Things in a Nutshell

Exploring smart homes

Exploring smart cars

Exploring industry 4.0 / the Industrial Internet of Things

Prototyping for the greater good

What is a prototype?

Voice control

Why should you invest in IoT?

Summary

Questions

Further reading

Basic Architecture of an IoT Prototype

Basic Architecture of an IoT Prototype

Building blocks of IoT connectivity

Understanding protocols and communication

Exploring microcontrollers for IoT

Summary

Questions

Further reading

Getting Started with MQTT

Getting Started with MQTT

Introducing MQTT

Understanding the principle of publish and subscribe

Exploring MQTT features

Analyzing the security of MQTT servers

MQTT servers and cloud providers

Comparing MQTT iOS and Android apps

Exploring MQTT desktop apps

Understanding MQTT libraries

Summary

Questions

Further reading

Setting Up a Lab Environment

Setting Up a Lab Environment

Hardware shopping list

Installing the essential tools and libraries

Understanding the shiftr.io web service

Troubleshooting

Summary

Questions

Further reading

Building Your Own Automatic Pet Food Dispenser

Building Your Own Automatic Pet Food Dispenser

Technical requirements

Testing the components

Controlling the servo motor via the Serial Monitor

Building the smart pet food dispenser

Optimizing the dispenser code

Improving the visual appearance

Making the dispenser controllable via MQTT

Summary

Questions

Building a Smart E-Ink To-Do List

Building a Smart E-Ink To-Do List

Technical requirements

Connecting the e-paper module/running the example

Simplifying the e-paper example

Modifying the e-paper example

Making your e-paper device accessible via serial

Preparing the MQTT integration

Making your e-paper device accessible with MQTT

Sending messages via MQTT

Enhancements and building a case

Summary

Questions

Further reading

Building a Smart Productivity Cube, Part 1

Building a Smart Productivity Cube, Part 1

Technical requirements

Building the smart productivity cube

Building the cube

Detecting orientation changes

Summary

Questions

Further reading

Building a Smart Productivity Cube, Part 2

Building a Smart Productivity Cube, Part 2

Making your device smart

Displaying the activity on your smartphone

Summary

Questions

Further reading

Presenting Your Own Prototype

Presenting Your Own Prototype

Using household boxes as cases

Using laser cutting to build custom cases

Using 3D printing to build custom cases

Evolution of a circuit – from breadboard to PCB

Summary

Assessments

Assessments

Chapter 1: The Internet of Things in a Nutshell

Chapter 2: Basic Architecture of an IoT Prototype

Chapter 3: Getting Started with MQTT

Chapter 4: Setting Up a Lab Environment

Chapter 5: Building Your Own Automatic Pet Food Dispenser

Chapter 6: Building a Smart E-Ink To-Do List

Chapter 7: Build a Smart Productivity Cube, Part 1

Chapter 8: Building a Smart Productivity Cube, Part 2

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Sending messages via MQTT

Our device is now ready to receive messages via MQTT. The MQTT server we are using features an MQTT, as well as an HTTP-interface. There are many different ways that we can now send messages to our device:

Via Terminal/PowerShell as MQTT messages using an MQTT client such as Mosquitto
Via Terminal/PowerShell as HTTP messages using curl
Via a third-party iOS/Android app
Via a third-party macOS/Windows/Linux app
Via a third-party web-based client (for example, http://www.hivemq.com/demos/websocket-client/)
Via a custom-made website using a JavaScript-MQTT client
Via a custom Android/iOS/macOS/Linux/Windows app using MQTT-client

Basically everything is possible depending on how you send text to your device. MQTT is amazing!

Because programming a custom app would be a bit much on top of what you have already learned, we will focus on the easier...

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