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Hands-On Internet of Things with MQTT

You're reading from   Hands-On Internet of Things with MQTT Build connected IoT devices with Arduino and MQ Telemetry Transport (MQTT)

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Product type Paperback
Published in Oct 2019
Publisher Packt
ISBN-13 9781789341782
Length 350 pages
Edition 1st Edition
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Author (1):
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Tim Pulver Tim Pulver
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Tim Pulver
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Table of Contents (16) Chapters Close

Title Page
Copyright and Credits About Packt Contributors Preface 1. The Internet of Things in a Nutshell FREE CHAPTER 2. Basic Architecture of an IoT Prototype 3. Getting Started with MQTT 4. Setting Up a Lab Environment 5. Building Your Own Automatic Pet Food Dispenser 6. Building a Smart E-Ink To-Do List 7. Building a Smart Productivity Cube, Part 1 8. Building a Smart Productivity Cube, Part 2 9. Presenting Your Own Prototype 1. Assessments 2. Other Books You May Enjoy

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

  1. QoS stands for quality of service. It was introduced in Chapter 3, Getting Started with MQTT.
  2. QoS 1 is a good compromise for our use case between reliability and performance. With QoS 1, we can be sure messages are delivered (if the other end also uses QoS 1 or 2).
  3. MQTT is an open protocol, so there are libraries for every programming language, more or less. There are also a lot of pre-made third-party applications for Android, iOS, macOS, Windows, Linux, and the web, which you can use. All you have to do is specify the login credentials of the MQTT server you are using (in our case, https://shiftr.io/).
  4. A client ID is basically the name of the MQTT client, as seen in the network. The MQTT server stores messages to be sent, as well as subscriptions for each client ID. Don't confuse this with the MQTT username and password: these are just for authentication.
  5. There can be only one loop and one setup function for each Arduino sketch. If you combine various examples into one, you need to make sure that you integrate the code accordingly. Having two functions with the same name will result in a compile-time error.
  6. There are many examples given in Chapter 3, Getting Started with MQTT, for MQTT apps on various platforms. You are missing out on all of the fun if you do not try them out. Third-party MQTT apps allow you to build your own user interfaces to control your smart devices without having to learn another programming language.
  7. When using your own login on https://shiftr.io/, you can activate private namespaces, so other MQTT clients cannot see what you send and cannot interfere with your namespace.

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