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Connecting Node-RED to OPC UA Servers: Subscriptions, Monitored Items & Event Catching

Step-by-step tutorial on integrating Node-RED with enterprise OPC UA servers: configuring node-red-contrib-opcua, setting up event subscriptions, deadband filtering, and JSON formatting.

  • node-red-contrib-opcua provides lightweight, visual drag-and-drop OPC UA client and server nodes.
  • Always use "Subscribe / Monitored Item" mode instead of "Read / Polling" mode to minimize network overhead.
  • Node-RED transforms complex OPC UA variant payloads into standard JSON objects ready for web APIs.

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