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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Configuring TLS transport security in Mosquitto

Now, we will configure Mosquitto to use TLS transport security and work with encrypted communications with different clients. Note that we haven't generated certificates for the clients, and therefore, we won't use client certificates for authentication. This way, any client that has the ca.crt file will be able to establish a communication with the Mosquitto server.

Go to the Mosquitto installation directory and create a new subdirectory named certificates. In Windows, you will need administrator privileges to access the default installation folder.

Copy the following files from the certificates directory, in which we have saved the certificate authority certificate and the server certificate, to the certificates subdirectory we recently created within the Mosquitto installation directory:

  • ca.crt

  • server.crt

  • server.key

In case you are running the Mosquitto server in a Terminal window in macOS or Linux, press Ctrl + C to stop it. In Windows...