MQTT 5: Request Response Pattern | MQTT 5 Essentials part 8
What is the Request Response Pattern?
The request response pattern in MQTT is different from the synchronous pattern in protocols like HTTP. In MQTT is works as asynchronous end-to-end acknowledgment. It ensures messages have been received by sending an acknowledge message back to the sender (so-called “business ACK”)
New Request Response Features in MQTT 5
1. Response Topic: defines the topic for the acknowledgment
2. Correlation Data: defines the correlation of published messages and responses
2. Response Information: allows the broker to send an optional UTF-8 string with information about the response topics that are expected to be used
Best Practices
If possible make use of the Response Information field
Use unique identifiers in the Response Topic
Make sure that intended responders and requesters have the necessary permissions to publish and subscribe to the response topics
** Chapters / Table of Contents **
00:00 Introduction
00:17 The Request Response pattern in MQTT
01:12 New Request Response features in MQTT 5
02:43 Use case: door opening for a Smart Home using MQTT5
03:31 Best practices and gotchas of MQTT5
04:50 Conclusion and announcement of part 9: Topic Alias in MQTT5
👉 Be sure to watch our first video series - MQTT Essentials - about the basic concepts of MQTT: • What is MQTT | MQTT Essentials Part 1
👉 We have a detailed blog series explaining all the new features available in MQTT 5: https://bit.ly/3zVD3Tz
👉 We also explain the core of MQTT, its features, and other essential information in this HiveMQ blog series: https://bit.ly/2Y7JHJn
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👉 We're looking forward to seeing you for MQTT 5 Essentials Part 9: Topic Alias
• MQTT 5 Essentials Part 09 - Topic Alias
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