Book Image

Hands-On Internet of Things with MQTT

By : Tim Pulver
Book Image

Hands-On Internet of Things with MQTT

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.

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Table of Contents (16 chapters)
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
1
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
2
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
3
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
4
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
5
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
6
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
7
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
8
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
9
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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Questions 

  1. How do you send a message using Mosquitto?
  2. How do you subscribe to messages using Mosquitto?
  3. What does -t stand for when using the Mosquitto commands?
  4. What does -m stand for when sending messages via MQTT?
  5. Have a look at the explore page of shiftr.io (https://shiftr.io/explore). Here, you will find public namespaces from other people. How do they use shiftr.io and MQTT? Can you tell by looking at the namespaces, topics, and connected clients? How do other people organize their topics? Which structure do they use?
  1. Try opening a few other tabs and sending messages from each of them. Open another one and experiment with subscriptions. Do you remember how they work? You can use slashes to create sub-topics (for example, /test/sub-topic), or use wildcards to subscribe to multiple topics at once (for example, /test/#), which will get an update once...
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