WEBVTT

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Open IoT Operations to follow the sensors, broker and topics in this prepared lab.

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Configure a sensor with its broker, topic, interval and signal recipe, then save.

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Start a subscriber on the Linux observer to watch the temperature topic.

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Use Publish Now to send a unique reading and check its topic and payload.

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The observer receives that same reading, and Control C disconnects the subscriber.

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Turn Running on for periodic readings, then stop the sensor when you finish.

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Publish a retained reading and replace it with the latest value.

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A fresh subscriber receives only the latest retained value for its matching topic.

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After deleting the retained value, a fresh subscriber waits for the next live message.

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This walkthrough uses the in-lab MQTT client with quality of service zero.

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Send Sparkplug JSON birth and data messages for this example edge and sensor.

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Check the group, device, metric count and sequence in the Sparkplug view.

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A death message marks the example device offline.

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Stop the broker and confirm that a manual publication fails without increasing its counter.

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Restart the broker and make a new explicit publication to verify recovery.

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Switch labs and return to confirm that readings and saved settings belong to the correct lab.

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This separate example broker already has a user and a restricted topic.

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Wrong credentials and a disallowed topic are refused without changing its retained messages.

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The allowed publication succeeds, and a correctly authenticated subscriber receives its value.