The demo OPC UA server

The demo server is a free, open-source OPC UA server we run so you can try UANode — or any OPC UA client — without owning a real machine. It is built with node-opcua and shows the main OPC UA features one small lesson at a time.

Endpoint

opc.tcp://demo.uanode.com:4840

• Anonymous login is enabled — no username or password needed.
• Security modes None and SignAndEncrypt (policy Basic256Sha256) are offered.
• It is a shared sandbox: values you write may be changed or reset at any time.

What is inside

The address space is organized as lessons, each showing one OPC UA feature:

• Folders, scalar values, arrays, and matrices of every data type.
• Enumerations, custom structures, and Data Access items with engineering units.
• Methods you can call, events you can monitor, and alarms you can acknowledge.
• Historical data and aggregates for charts and trends.
• State machines, views, file transfer, and access control.

How to use it

• In UANode: click Try the demo and connect — no setup needed.
• In your own client (UaExpert, Prosys, a script): connect to opc.tcp://demo.uanode.com:4840 with anonymous login.

The server is open source: uanode/node-opcua-demo-server. Please be kind to it — it is a shared demo, not a production system.