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Testing an MQTT Automation With a Fictional Event Before Relying on It

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An MQTT automation can appear complete in the editor and still fail when real messages arrive from a broker. A manual action or dashboard check does not confirm that the topic, payload filter, template, and action work together. The article recommends a small fictional test using a reserved test topic, clearly fake data, and a harmless visible action such as a persistent notification. Such a test only shows that one known publisher's message reached one automation, not that a real device is present or that delivery is guaranteed. MQTT topic matching is exact unless wildcards are configured, so even small differences like a trailing letter or a case change will prevent a trigger from firing.

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