Page History

When data is flushed and published from a History Store, the com.cirruslink.mqtt.edge.history.HistoryPublisher logger will generate messages to INFO level that report how many metrics have been published from the Edge device

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If MQTT Transmission is configured to Flush In-Order, then all the historic data will be flushed before the publishing of live data resumes otherwise the historic data messages will be intermingled with the live DDATA messages.

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Another option is to use MQTT Engine as your MQTT client to subscribe to the Sparkplug Edge node publishing the data.

Set Navigate to the Ignition Diagnostic > Logs and set the com.cirruslink.mqtt.engine.gateway.sparkplug.SparkplugPayloadHandler logger to TRACE and the incoming .

Incoming Sparkplug messages will be logged showing the content of the payload

Using

There are a couple of ways to view these generated logs:

• Export the logs using the Download Logs icon and use a database browser such as DB Browser (SQLite)

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• to easily examine the downloaded Ignition logs .idb file and query the message contents

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• Export the Ignition Wrapper Logs and use a file editor such as Notepad++ to easily examine the message text to query the data content.