PublishRequestCount, DataChangeNotificationsCount meaning
Posted: 19 Feb 2020, 09:43
Hello,
I am currently analysing a problem I have with a OPC-UA implementation in Python that I have created. I know this is not a library supported here but my questions is more general and concerning UaExperts Server Diagnostics View.
In the tab Subscription Diagnostic there are the parameters PublishRequestCount and DataChangeNotificationsCount. I am looking for the meaning of these parameter.
Is this the amount of requests the server receives by the client whether the value of the subscribed node has changed?
And is the DataChangeNotificationsCount the amount of answers by the server that "yes" the value did change. Would this counter not incease if the value did not change?
Does the server take care of checking if the value is still the same or does the server always return the current value and checking must be done by the client?
As a side node: my problem is that I receive data change notifications by a OPC-UA server (numeric values) although the value did not change. So in a high frequency I receives new values like 1, 1, 1, 1, 10, 10, 10, 10, etc.
I am currently analysing a problem I have with a OPC-UA implementation in Python that I have created. I know this is not a library supported here but my questions is more general and concerning UaExperts Server Diagnostics View.
In the tab Subscription Diagnostic there are the parameters PublishRequestCount and DataChangeNotificationsCount. I am looking for the meaning of these parameter.
Is this the amount of requests the server receives by the client whether the value of the subscribed node has changed?
And is the DataChangeNotificationsCount the amount of answers by the server that "yes" the value did change. Would this counter not incease if the value did not change?
Does the server take care of checking if the value is still the same or does the server always return the current value and checking must be done by the client?
As a side node: my problem is that I receive data change notifications by a OPC-UA server (numeric values) although the value did not change. So in a high frequency I receives new values like 1, 1, 1, 1, 10, 10, 10, 10, etc.