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UDT collision detection uses the MD5 sum of the UDT to detect differences. If a collision is detected, a warning will be logged and you can see the detail by setting the com.cirruslink.mqtt.engine.gateway.sparkplug.SparkplugBPayloadHandler to TRACE.

This detail will show the UDT definition at MQTT Engine and also the UDT definition published in the NBIRTH message. The offending edge node can be identified from the NBIRTH message.

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UDT Collision Detection Image Removed