Design a scalable, secure MQTT topic hierarchy and payload schema for a fleet of IoT devices, covering naming, QoS, retained messages, last-will, and broker access control.
## CONTEXT MQTT is the dominant messaging protocol for IoT because it is lightweight, supports unreliable networks gracefully, and decouples publishers from subscribers through a broker. A fleet that starts with three devices and ad-hoc topic names becomes unmanageable at three thousand devices unless the topic…
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