MQTT-SN in Zephyr: Lightweight Messaging for Constrained Devices
summary
Zephyr contains a working MQTT-SN client library plus a UDP/IP reference transport and example code contributed in 2022 and used in a cat tracker and OpenThread nodes. Supported features include gateway discovery and topic aliasing with wildcard subscription mapping; missing features are predefined topics and publish-before-connect. Practical limits surface: sleepy devices top out at about 18 hours, topic alias tables can exhaust memory, and there are no built-in DTLS/reliability guarantees so end-to-end security and QoS need extra work.
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chapters (7)
- 0:00MQTT and MQTT-SN intro
- 2:37MQTT-SN for constrained devices
- 4:25MQTT vs MQTT-SN
- 6:52MQTT-SN features
- 8:14MQTT-SN challenges
- 10:00MQTT-SN in Zephyr RTOS
- 11:24Real-world use cases and conclusion
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