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Hands-On MQTT Programming with Python

Hands-On MQTT Programming with Python

By : Gaston C. Hillar
2.3 (3)
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Hands-On MQTT Programming with Python

Hands-On MQTT Programming with Python

2.3 (3)
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)
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Unsubscribing from topics with a GUI tool

Whenever we don't want a subscriber to receive more messages whose destination topic name matches one or more topic filters, the subscriber can send a request to unsubscribe to a list of topic filters to the MQTT server. Obviously, unsubscribing from topic filters is the opposite of subscribing to topic filters. We will use the MQTT.fx GUI utility to unsubscribe the MQTT client from the sensors/octocopter01/altitude topic. Follow these steps:

  1. Go to the MQTT.fx window in which you established a connection and subscribed to a topic.
  2. Click Subscribe.
  1. Click on the panel that displays the sensors/octocopter01/altitude topic name on the left-hand side of the window. Then, click on the Unsubscribe button located in this panel. The following screenshot shows this button:
  1. MQTT.fx will unsubscribe the client from the sensors/octocopter01...

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