The Node-RED node to communicate via OPC UA, powered NodeOPCUA and developed by Sterfive's team
npm install @opcua/for-node-red@opcua/for-node-red
This node is the second next-generation OPCUA Node for NodeRED built by Sterfive, the company that develops the NodeOPCUA stack.
It brings the following OPCUA Client features.
- Read - read one or more UAVariables.
- Write - write one or more UAVariables.
- Browse - browse a UANode for references and child nodes.
- Monitor - monitor a UAVariable for changes.
- MonitorEvents - monitor a UAObject for events.
- Call - call a method passing input arguments and getting output arguments.
- Explore - explore the OPCUA server address space subtree and get information about nodes and references as JSON structure.
- HistorRead - read historical data from an OPCUA server.
The community edition works with one connection to one OPCUA server and can handle up to 100 simultaneous operations per node.
The professional edition works with multiple connections to multiple OPCUA servers and has no limitation on the number of simultaneous operations per node, except the one imposed by the OPCUA server itself.
It has been designed with the following goals in mind:
- easy to use, easy to configure; no deep OPCUA knowledge required.
- provide visual tools to pick up nodeId by browsing the OPCUA server.
- handle nodes address with either nodeId or browse path, or both.
- works well with complex OPCUA servers, exposing complex data structures (extension objects).
- arbitrary number of nodes sharing the same connection
- support for multiple connections to multiple OPCUA servers.
- automatically handle transaction optimization by grouping or splitting operations based on actual OPCUA server capabilities.
- automatically handle reconnections in case of network failure, in a way that works.
- use Client sessions sparingly on the OPCUA server side.
- handle automatically OPCUA server certificate management.
- explore and monitor complex UAObject structures in the address space with ease.
The Call node:
The explore node:
Different ways to use the nodes:
The easiest way to install the nodes is to use the Manage palette option in the Node-RED editor menu. In the Install tab, you can search for the @opcua/for-node-red package and click install. Once the installation is complete the nodes are available.
Alternatively, you can install the nodes in your Node-RED configuration folder inside the .node-red directory:
`console``
cd ~/.node-red
npm install @opcua/for-node-red
The nodes will be available after a restart of the Node-RED application.
see the documentation guide for more information
- post your questions or issues on the github repository
- send your request to contact@sterfive.com to claim access to the professional edition.
Why is it not free?
We think our Community Edition is a really good tool for most people's needs.
But our Professional Edition is for those who need something extra, especially for business use.
Our business customers want a reliable and strong solution that comes with ongoing support and regular maintenance. They need technology that's ready to use in their work, and the best way to keep this kind of tech well-maintained and supported is by purchasing a license.
At Sterfive, we're already doing a lot to provide a great free open-source option, and we're also working hard to make sure our NodeRED node is top-notch.
Where can I register for a license?
You can subscribe online for a license at https://www.sterfive.com/opcua/for-node-red
Copyright (c) Sterfive SAS 2017-2025, under proprietary licence.