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MQTT Essentials - A Lightweight IoT Protocol

You're reading from   MQTT Essentials - A Lightweight IoT Protocol The preferred IoT publish-subscribe lightweight messaging protocol

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Product type Paperback
Published in Apr 2017
Publisher Packt
ISBN-13 9781787287815
Length 280 pages
Edition 1st Edition
Languages
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Author (1):
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Gastón C. Hillar Gastón C. Hillar
Author Profile Icon Gastón C. Hillar
Gastón C. Hillar
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Table of Contents (16) Chapters Close

MQTT Essentials - A Lightweight IoT Protocol
Credits
About the Author
Acknowledgment
About the Reviewer
www.PacktPub.com
Customer Feedback
Dedication
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 Exersise Answers

Testing the MQTT TLS configuration with MQTT-spy


There is another very popular utility to generate MQTT clients that can subscribe to topics and publish to topics: MQTT-spy. This utility is open source and can run on any computer that has Java 8 or a higher version installed on it. You can find more information about MQTT-spy at http://kamilfb.github.io/mqtt-spy. The options to establish a connection with an MQTT server with a certificate authority certificate file are similar to the ones we analyzed for MQTT.fx. However, in case you also want to work with this utility, it is convenient to analyze them in detail.

Now, we will use the MQTT-spy GUI utility to generate another MQTT client that uses an encrypted connection to publish messages to the same topic, that is, sensors/drone01/altitude. Follow the next steps:

  1. Launch MQTT-spy.

  2. Select Connections | New connection. The Connection list dialog box will appear.

  3. Click on the Connectivity tab and select MQTT 3.1.1 in the Protocol version dropdown...

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