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MQTT for IoT and Home Automation: A Practical Guide to Brokers, Topics, Devices, Sensors, Node-RED, ESP32, Home Assistant, and Real Time Messaging
Paperback
Publisher: Independently Published
Published: Aug 20 2026
Pages: 200
Weight: 0.55
Height: 0.50 Width: 6.00 Depth: 9.00
Language: English
Connected devices become far more useful when they can exchange information without every sensor, controller, and application being tightly coupled together.
MQTT for IoT and Home Automation gives you a practical path to understanding and building reliable message-based systems for sensors, microcontrollers, automation software, and locally controlled smart homes.
Rather than treating MQTT as a list of protocol terms, this book shows how messages actually move through a working system. You will learn how publishers, subscribers, clients, brokers, topics, and payloads fit together-and how good design choices make a system easier to extend, troubleshoot, secure, and maintain.
You will begin with the publish-and-subscribe model and learn why a broker can simplify communication between many independent devices and applications.
From there, you will learn how to:
- Understand clients, brokers, publishers, subscribers, topics, and payloads
- Compare publish/subscribe messaging with request/response communication
- Work with MQTT 3.1.1 and MQTT 5 concepts
- Understand client identifiers, Keep Alive, Clean Start, and session behavior
- Choose appropriate Quality of Service levels
- Use retained messages correctly
- Detect unexpected device disconnections with Last Will messages
- Handle duplicate delivery safely
- Design scalable topic hierarchies
- Use single-level and multi-level subscription wildcards
- Separate commands, reported state, availability, and events
- Build clear JSON payloads
- Install and configure a local message broker
- Test publishers and subscribers from the command line
The practical exercises gradually develop from simple command-line message testing into real connected systems.
You will install and configure a private broker, publish and subscribe to messages, test retained state and availability, then build sensor and control devices that can reconnect after interruptions and accurately report what they are doing.
The application layer expands with Node-RED, where incoming data can be inspected, validated, transformed, filtered, routed, and used to trigger new actions. Home Assistant is then added to provide locally controlled entities, device visibility, availability information, manual control, and discovery-based configuration.
Reliability is treated as part of the design rather than something added after failures begin. You will learn how QoS, retained state, persistent sessions, availability messages, expiry behavior, reconnect logic, and confirmed device state affect what happens when Wi-Fi disappears, a broker restarts, or a device temporarily goes offline.
Security receives the same practical treatment. The book explains why authentication alone is not enough and shows the importance of authorization, controlled topic access, protected credentials, limited network exposure, and encryption where traffic crosses networks that should not be trusted.
You will deliberately test broker restarts, Wi-Fi interruptions, malformed payloads, device reboots, application restarts, stale retained information, and reconnection behavior so the completed system does more than work once on a bench-it can recover predictably.
Whether you are exploring IoT communication for the first time, building a private smart home, or connecting embedded devices to larger automation platforms, this book provides a structured path from your first publication to a complete, maintainable messaging architecture.
Move beyond simply sending messages. Build an MQTT system whose topics are clear, devices recover correctly, access is controlled, and failures can be traced instead of guessed.
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