How can I use the dashboard to write variables in an OPC UA server?

What product/components do you use and which version/fix level?

Cumulocity OPC UA agent (java) 1013.0.125

Are you using a free trial or a product with a customer license?

customer license

What are trying to achieve? Please describe in detail.

We are running the OPC UA agent, it is registered in Cumulocity IoT as device and we have set up a dashboard which displays several values from our OPC UA server. Now we want to write variables in the OPC UA server with the dashboard.

Do you get any error messages? Please provide a full error message screenshot and log file.

We have no glue how to do that. Is there a widget for that which we didn’t know ?
An example would be great !

Have you installed latest fixes for the products

Think so

Hello Benedikt,

writing values to an OPC UA server are possible via operation. As far as i know, there isn’t a standard widget which allows to create opc-ua specific operations. You have to use the REST api: see: OPC UA - Cumulocity IoT Guides

Example: (deviceId == OPC UA Server managed object id)
POST: {{url}}/devicecontrol/operations/

  "deviceId" : "2810961",
  "c8y_ua_command_WriteValue": {
    "values": {
        "ns=2;s=MySwitch": {
            "value": "true"
  "description":"Write Value to ns=2;s=MySwitch"

Creating a custom widget would be the right solution, which creates such operation.

Best regards,

1 Like

Hi Benedikt,

I have a few examples in a Postman Collection attached. (3.2 KB)


Please find response inline

Hi Benedikt,

The asset table widget actually allows you to also send operations to assets.
See attached screenshots.