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Hands-On MQTT Programming with Python

You're reading from   Hands-On MQTT Programming with Python Work with the lightweight IoT protocol in Python

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Product type Paperback
Published in May 2018
Publisher Packt
ISBN-13 9781789138542
Length 228 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 (9) Chapters Close

Preface 1. Installing an MQTT 3.1.1 Mosquitto Server 2. Using Command-Line and GUI Tools to Learn How MQTT Works FREE CHAPTER 3. Securing an MQTT 3.1.1 Mosquitto Server 4. Writing Code to Control a Vehicle with Python and MQTT Messages 5. Testing and Improving Our Vehicle Control Solution in Python 6. Monitoring a Surfing Competition with Cloud-Based Real-Time MQTT Providers and Python 7. Solutions 8. Other Books You May Enjoy

Forcing the TLS protocol version to a specific number

It is good practice to use the highest possible TLS protocol version. By default, a Mosquitto server accepts TLS 1.0, 1.1, and 1.2. If all the clients are capable of working with the highest TLS protocol version supported by Mosquitto, we should force Mosquitto to use only the highest version. This way, we make sure that we won't be vulnerable to attacks on previous TLS versions.

Now, we will make the necessary changes in the configuration file to force the use of TLS 1.2. If you are running the Mosquitto server in a Terminal window in macOS or Linux, press Ctrl + C to stop it. In Windows, stop the appropriate service.

Go to the Mosquitto installation directory and open the mosquitto.conf configuration file.

In macOS, Linux, or Windows, add the following line at the end of the configuration file:

tls_version tlsv1.2

We...

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