| Questions | Answers |
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Chapter 4: Writing Code to Control a Vehicle with Python and MQTT Messages
by Gaston C. Hillar
Hands-On MQTT Programming with Python
- Title Page
- Copyright and Credits
- Packt Upsell
- About the Author
- Preface
- Installing an MQTT 3.1.1 Mosquitto Server
- Understanding convenient scenarios for the MQTT protocol
- Working with the publish-subscribe pattern
- Working with message filtering
- Understanding the MQTT puzzle – clients, servers, and connections
- Installing a Mosquitto server on Linux
- Installing a Mosquitto server on macOS
- Installing a Mosquitto server on Windows
- Considerations for running a Mosquitto server in the cloud
- Test your knowledge
- Summary
- Using Command-Line and GUI Tools to Learn How MQTT Works
- Subscribing to topics with a command-line tool
- Subscribing to topics with a GUI tool
- Publishing messages with a command-line tool
- Publishing messages with a GUI tool
- Unsubscribing from topics with a GUI tool
- Learning best practices for topics
- Understanding MQTT wildcards
- Learning about the different QoS levels
- Working with at least once delivery (QoS level 1)
- Working with exactly once delivery (QoS level 2)
- Understanding overhead in the different Quality of Service levels
- Test your knowledge
- Summary
- Securing an MQTT 3.1.1 Mosquitto Server
- Understanding the importance of securing a Mosquitto server
- Generating a private certificate authority to use TLS with Mosquitto
- Creating a certificate for the Mosquitto server
- Configuring TLS transport security in Mosquitto
- Testing the MQTT TLS configuration with command-line tools
- Testing the MQTT TLS configuration with GUI tools
- Creating a certificate for each MQTT client
- Configuring TLS client certificate authentication in Mosquitto
- Testing the MQTT TLS client authentication with command-line tools
- Testing the MQTT TLS configuration with GUI tools
- Forcing the TLS protocol version to a specific number
- Test your knowledge
- Summary
- Writing Code to Control a Vehicle with Python and MQTT Messages
- Understanding the requirements to control a vehicle with MQTT
- Defining the topics and commands
- Creating a virtual environment with Python 3.6.x and PEP 405
- Understanding the directory structure for a virtual environment
- Activating the virtual environment
- Deactivating the virtual environment
- Installing paho-mqtt for Python
- Connecting a client to the secured MQTT server with paho-mqtt
- Understanding callbacks
- Subscribing to topics with Python
- Configuring certificates for IoT boards that will work as clients
- Creating a class to represent a vehicle
- Receiving messages in Python
- Working with multiple calls to the loop method
- Test your knowledge
- Summary
- Testing and Improving Our Vehicle Control Solution in Python
- Processing commands with Python
- Sending messages with Python
- Working with the network loop with Python
- Working with last will and testament with Python
- Working with retained last will messages
- Understanding blocking and non-blocking code
- Using the threaded client interface
- Test your knowledge
- Summary
- Monitoring a Surfing Competition with Cloud-Based Real-Time MQTT Providers and Python
- Understanding the requirements
- Defining the topics and payloads
- Coding a surfboard sensor emulator
- Configuring the PubNub MQTT interface
- Publishing data retrieved from sensors to the cloud-based MQTT server
- Working with multiple MQTT servers
- Running multiple clients
- Building a web-based dashboard with freeboard
- Test your knowledge
- Summary
- Solutions
- Chapter 1: Installing an MQTT 3.1.1 Mosquitto server
- Chapter 2: Using Command-Line and GUI Tools to Learn How MQTT Works
- Chapter 3: Securing an MQTT 3.1.1 Mosquitto Server
- Chapter 4: Writing Code to Control a Vehicle with Python and MQTT Messages
- Chapter 5: Testing and Improving our Vehicle Control Solution in Python
- Chapter 6:  Monitoring a Surfing Competition with Cloud-Based Real-Time MQTT Providers and Python
- Other Books You May Enjoy
Chapter 4: Writing Code to Control a Vehicle with Python and MQTT Messages
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