Using OpcCmd Utility as OPC UA PubSub Sniffer
This article assumes that you have basic knowledge of the OPC UA PubSub Sniffing concepts; please read the corresponding article first.
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Accessing the OPC UA PubSub Sniffer
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uaSubscriber getService uaPubSubSniffer
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uaPubSubSniffer subscribeCapture command
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Limiting the capture types
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Selecting distinct headers
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Capturing message data
(TBD) Binary data (UADP) are shown in hexadecimal format, textual data (JSON) are decoded first, and shown as strings.
Typical usage scenarios
Show all communication
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subscribeCapture opc.udp://239.0.0.1:4840
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subscribeCapture mqtt://opcua-pubsub.demo-this.com #
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Discover who communicates what
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Discover who communicates what with UDP transport mapping:
subscribeCapture opc.udp://239.0.0.1:4840 --CaptureTypes AllPubSubMessages --DistinctHeadersOnly !wait Infinite
Discover who communicates what with MQTT transport mapping:
subscribeCapture mqtt://opcua-pubsub.demo-this.com # --CaptureTypes AllPubSubMessages --DistinctHeadersOnly !wait Infinite
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Capture and show message data
In order to view the original messages as they are being communicated on the specified PubSub connection, use the --ShowCaptureData option. In our example, we are not interested in further analysis of the received messages, and we therefore limit the capture to the TransportMessage type, by using the --CaptureTypes option. By removing this option, you can view the captured data together with their analysis as OPC UA PubSub messages.
Capture and show message data with UDP transport mapping:
subscribeCapture opc.udp://239.0.0.1:4840 --CaptureTypes TransportMessage --ShowCaptureData
Capture and show message data with MQTT transport mapping:
subscribeCapture mqtt://opcua-pubsub.demo-this.com # --CaptureTypes TransportMessage --ShowCaptureData
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