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I am using OPC UA java stack and developing an OPC UA client. I have made subscriptions and publish request to a monitored Item. I am using datachangefilter to set trigger if the value of the monitored item changes. Now I am able to get notification. But i want to get the notification only when data change occurs. I am using this code snippet 

        DataChangeFilter datachange = new DataChangeFilter();
        datachange.setTrigger(DataChangeTrigger.StatusValue);
Lijo Louis
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1 Answers1

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This would be the correct DataChangeFilter. What's the problem?

Kevin Herron
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  • I get notification even if the value doesnot change(publish response- notification message - notification data ). DataChangeTrigger.StatusValue report a notification if either the StatusCode or the value change. – Lijo Louis May 24 '16 at 07:27
  • Also i get notification only once after publish request. After that even if the value changes I am not getting any notification. Is there any easy way to create a listener for datachangenotification. – Lijo Louis May 24 '16 at 08:35