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HDA : Read History Event
September 27, 2013
13:15, EEST
Vienna, Austria
Forum Posts: 20
Member Since:
April 9, 2013
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I am using the Prosys OPC UA Java SDK with the Client sample.
When I try to read History Event it sends a ReadEventDetails with an EventFiter.
I just wonder why the NoOfSelectClauses is 9 but the array length is 8.
And what are the EventFilter SimpleAttributeOperand of name : MyVariable and MyProperty.


Camille G.

September 27, 2013
13:44, EEST
Jouni Aro
Forum Posts: 846
Member Since:
December 21, 2011
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Hi Camille,

initEventFieldNames() adds the fields MyVariable and MyProperty to match against the MyEventType, which you may trigger from the SampleConsoleServer.

createEventFilter() indeed adds an extra SelectClause. It does that for the NodeId field, as a bit different definition:

new SimpleAttributeOperand(eventTypeId, null, Attributes.NodeId, null);

, where as the normal fields are defined with Attributes.Value and the respective browsePath.

new SimpleAttributeOperand(eventTypeId, browsePath, Attributes.Value, indexRange);
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