Book Image

Hands-On MQTT Programming with Python

By : Gaston C. Hillar
Book Image

Hands-On MQTT Programming with Python

By: Gaston C. Hillar

Overview of this book

<p>MQTT is a lightweight messaging protocol for small sensors and mobile devices. This book explores the features of the latest versions of MQTT for IoT and M2M communications, how to use them with Python 3, and allow you to interact with sensors and actuators using Python.</p> <p>The book begins with the specific vocabulary of MQTT and its working modes, followed by installing a Mosquitto MQTT broker. You will use different utilities and diagrams to understand the most important concepts related to MQTT. You will learn to make all the necessary configuration to work with digital certificates for encrypting all data sent between the MQTT clients and the server. You will also work with the different Quality of Service levels and later analyze and compare their overheads.</p> <p>You will write Python 3.x code to control a vehicle with MQTT messages delivered through encrypted connections (TLS 1.2), and learn how leverage your knowledge of the MQTT protocol to build a solution based on requirements. Towards the end, you will write Python code to use the PubNub cloud-based real-time MQTT provider to monitor a surfing competition.</p> <p>In the end, you will have a solution that was built from scratch by analyzing the requirements and then write Python code that will run on water-proof IoT boards connected to multiple sensors in surfboards.</p>
Table of Contents (9 chapters)

Deactivating the virtual environment

It is extremely easy to deactivate a virtual environment generated with the previously explained process. The deactivation will remove all the changes made in the environment variables and will change the prompt back to its default message. Once you deactivate a virtual environment, you will go back to the default Python environment.

In macOS or Linux, just type deactivate and press Enter.

In Command Prompt, you have to run the deactivate.bat batch file included in the Scripts folder. In our example, the full path for this file is %USERPROFILE%\HillarMQTT\01\Scripts\deactivate.bat.

In Windows PowerShell, you have to run the Deactivate.ps1 script in the Scripts folder. In our example, the full path for this file is $env:userprofile\HillarMQTT\01\Scripts\Deactivate.ps1. Remember that you must have scripts execution enabled in Windows PowerShell...