Build an MQTT Topic and QoS Map

A factory MQTT broker uses vague topics like device/data for telemetry, state changes, commands, and acknowledgements. Permissions are broad, dashboards parse payloads to infer meaning, and QoS is chosen by habit. Design topics by message class and access boundary before choosing QoS The common trap is to create topics that mirror the first firmware payload instead of the operational contract. That shortcut hides who may publish, who may subscribe, how long the message remains useful, and whether loss or duplication matters. The namespace becomes a junk drawer, and every later policy requires fragile payload inspection. 1. Name the scope Use…

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