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
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Securing MQTT over WebSockets with TLS

So far, we have been working with MQTT over WebSockets without TLS. We can change the configuration and make simple edits to the code to work with MQTT over WebSockets with TLS and enable encrypted communications.

In Chapter 2, Securing an MQTT Mosquitto Server , we secured our Mosquitto server, and therefore, we can use the digital certificates we have created. However, it is very important to know that self-signed certificates require more steps to be installed as trusted certificates in the different operating systems that run the diverse web browsers that can use MQTT over WebSockets.

In this chapter, we saved the following files in a directory called certificates. We will use these file names as a baseline for a sample configuration.

  • ca.crt: Certificate authority certificate file

  • device001.crt: Client certificate file

  • device001.key: Client key

In order to work with WebSockets over TLS and enable encrypted communications, it is necessary to follow...