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.
Table of Contents (16 chapters)
Title Page

Chapter 8: Building a Smart Productivity Cube, Part 2

  1. MQTT apps for iOS and Android can be used to both display and send MQTT messages. Their purpose is to build a personal dashboard that allows you to consume all of the important information published by your MQTT devices and to control them by publishing messages as well.
  2. To send just the activity time (without the activity name), you have to change the client.publish("/tims-channel/cube/activity", text); line to client.publish("/tims-channel/cube/activity", timeSpend);.
  3. A good client ID, to be compatible with most MQTT clients and servers, should be no longer than 23 characters and only contain regular characters (a-z, 0-9, and -). Also, you should make sure that nobody else is using the same name on the same MQTT server. The easiest way is just by appending a few random digits to your client ID (for example, your-name-184638).