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MQTT Essentials - A Lightweight IoT Protocol

You're reading from   MQTT Essentials - A Lightweight IoT Protocol Send and receive messages with the MQTT protocol for your IoT solutions.

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Product type Paperback
Published in Apr 2017
Publisher Packt
ISBN-13 9781787287815
Length 280 pages
Edition 1st Edition
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Author (1):
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Gaston C. Hillar Gaston C. Hillar
Author Profile Icon Gaston C. Hillar
Gaston C. Hillar
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Table of Contents (8) Chapters Close

Preface 1. Lightweight Messaging with MQTT 3.1.1 and Mosquitto FREE CHAPTER 2. Securing an MQTT Mosquitto Server 3. Controlling a Drone with Python 4. Interacting with Sensors in Java 5. Controlling Home Automation in JavaScript 6. Interacting with Actuators in Swift A. Exersise Answers

Connecting the client to the MQTT server with Python


First, we will use paho_mqtt to create an MQTT client that connects to the Mosquitto MQTT server. We will write a few lines of Python code to establish a secured connection and subscribe to a topic.

In the previous chapter, we secured our Mosquitto server, and therefore, we will use the digital certificates we had created to authenticate the client. Most of the time, we will work with an MQTT server that uses TLS, and therefore, it is a good idea to learn how to establish a connection with TLS and TLS authentication. It is easier to establish an unsecured connection with an MQTT server, but it won't be the most common scenario we will face when developing applications that work with MQTT.

First, we need to copy the following files we had created in the previous chapter to a directory in the computer or device we will use to run a Python script. We saved the files in a directory called certificates. Create a python_certificates directory...

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