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

Summary

In this chapter, you learned how to display text on an e-paper display and how to send text to it either via serial port or MQTT.

You learned how to make use of MQTT features such as QoS 1 and retained messages. QoS 1 makes sure messages are delivered at least once. The last message sent with the retained message flag is stored for each channel. When clients subscribe to it, they will instantly receive the last available retained message, even when no message has been published since the Arduino resubscribed. 

You also learned how to send messages using different QoS settings as well as the retained message flag via the free command-line tool Mosquitto.

In the next chapter, you will build another MQTT-connected device: a smart productivity cube. Using a custom made orientation sensor, this device can be used to track the time that you spend watching TV or exercising...