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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

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...
You have been reading a chapter from
Hands-On MQTT Programming with Python
Published in: May 2018
Publisher: Packt
ISBN-13: 9781789138542
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