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Subscribe Event without a Filter
March 12, 2014
14:41, EET
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infraview.schmidt
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August 13, 2013
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Can i subscribe a event without a filter?

The MonitoringEventItem provides a constructor which takes only a NodeId, but i get a Exception when i try to subscribe.

com.prosysopc.ua.StatusException: Bad_MonitoredItemFilterUnsupported (0x80440000) “The server does not support the requested monitored item filter.” StatusCode=Bad_MonitoredItemFilterUnsupported (0x80440000) “The server does not support the requested monitored item filter.”
at com.prosysopc.ua.client.UaClient.a(Unknown Source)
at com.prosysopc.ua.client.Subscription.addItem(Unknown Source)

My code is:
private static void startSubscription() throws ServiceException, StatusException {

subscription = new Subscription();
client.addSubscription(subscription);
statusEventTest = new MonitoredEventItem(Properties.NODE_ID_STATUS_TEST);
subscription.addItem(statusEventTest);

}

The goal is to implement a Client which can subscribe different events with generic code.

March 12, 2014
15:34, EET
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Jouni Aro
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December 21, 2011
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No you cannot. The filter is used to define the event fields (in the SelectClause) that you wish to listen to. So without a filter, there would not be anything to send. The WhereClause of the filter, which can limit events that are sent based on the field values, is optional.

March 13, 2014
6:45, EET
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infraview.schmidt
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ok thanks

i tought there would be something like SELECT * in SQL, but i can also define each field

March 13, 2014
6:49, EET
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Jouni Aro
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The number of possible fields can be very large, so ‘*’ does not make sense. And you need to know what the fields are, when you get the notifications as an array of Variant values only.

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