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Difference between errorcode and statuscode when subscribing to OPC UA
September 14, 2021
13:54, EEST
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amj005
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Hi,

I am using subscription to OPC UA and reading values from onDataChange call back method.

I want to understand difference between the status codes under MonitoredDataItem and DataValue.

1. Are monitoredDataItem.errorCode and dataValue.getStatusCode both same?

2. And where can we get the error code when we call client.readValue, because here we do get only DataValue response?

Thanks!

September 14, 2021
14:45, EEST
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Matti Siponen
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Hello,

1. The StatusCode provided by MonitoredDataItem.getErrorCode() contains error codes related to creation of the MonitoredItem and the StatusCode provided by DataValue.getStatusCode() describes the “quality” of the value.

2. The response of a Read operation doesn’t include separate error codes, but you can check the StatusCodes of the returned DataValues for errors related to Reading the values.

September 15, 2021
16:33, EEST
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amj005
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Thank you!
So, If I am just focusing on the error of that particular dataValue, I should be just using StatusCode and ignore MonitoredItem altogether right?

September 16, 2021
7:52, EEST
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Matti Siponen
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Correct, to detect errors in the Value of a Variable, it is sufficient to check the StatusCode provided by the DataValue.

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