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
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