Book Image

MQTT Essentials - A Lightweight IoT Protocol

5 (1)
Book Image

MQTT Essentials - A Lightweight IoT Protocol

5 (1)

Overview of this book

This step-by-step guide will help you gain a deep understanding of the lightweight MQTT protocol. We’ll begin with the specific vocabulary of MQTT and its working modes, followed by installing a Mosquitto MQTT broker. Then, you will use best practices to secure the MQTT Mosquitto broker to ensure that only authorized clients are able to publish and receive messages. Once you have secured the broker with the appropriate configuration, you will develop a solution that controls a drone with Python. Further on, you will use Python on a Raspberry Pi 3 board to process commands and Python on Intel Boards (Joule, Edison and Galileo). You will then connect to the MQTT broker, subscribe to topics, send messages, and receive messages in Python. You will also develop a solution that interacts with sensors in Java by working with MQTT messages. Moving forward, you will work with an asynchronous API with callbacks to make the sensors interact with MQTT messages. Following the same process, you will develop an iOS app with Swift 3, build a website that uses WebSockets to connect to the MQTT broker, and control home automation devices with HTML5, JavaScript code, Node.js and MQTT messages
Table of Contents (16 chapters)
MQTT Essentials - A Lightweight IoT Protocol
About the Author
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Understanding the requirements to control a drone with MQTT

In the previous chapters, we learned how MQTT works in detail. We understood how to establish a connection between an MQTT client and an MQTT server. You learned what happens when we subscribe to topic filters and when a publisher sends messages to specific topics. We installed and secured a Mosquitto server.

Now, we will use Python as our main programming language to generate MQTT clients that will act as publishers and subscribers. We will connect a Python MQTT client to the MQTT server and we will process commands to control a drone with MQTT messages.

We will use TLS encryption and TLS authentication because we don't want any MQTT client to be able to send commands to our drone. We want our Python code to run on many platforms because we will use the same code base to control drones that use the following IoT boards:

  • Raspberry Pi 3

  • Raspberry Pi 2 Model B

  • Intel Edison

  • Intel Galileo Gen 2

  • Intel Joule 570x

  • Intel Joule 550x

Depending on...