Hi,

I’ve a question regarding the parameter numValuesPerNode for the historyReadRaw method:

JavaDoc is:
numValuesPerNode – the maximum number of events to return for a single node. If the value is 0, all values between startTime and endTime are returned.

I did some tests using Wireshark to see the HistoryReadRequest/Response calls. I’m requesting history values for one hour from the SimulationServer for one of the Simulation Nodes. So there should be 3600 parameters.

When I set the numValuesPerNode to 0, there is one Request/Response where the response contains as expected the 3600 values.

When I set the numValuesPerNode to 1000, there are four Request/Response where the first 3 response cotains as expected each 1000 values und the 4th the remaining 600.

But then I set the numValuesPerNode to 100, and I would have expected 36 Request/Repsonses, but there are still 4 like when the numValuesPerNode is set to 1000.

So it looks like this:

ReadRawModifiedDetails: ReadRawModifiedDetails
IsReadModified: False
StartTime: Mar 19, 2026 15:00:00.000000000 Mitteleuropäische Zeit
EndTime: Mar 19, 2026 16:00:00.000000000 Mitteleuropäische Zeit
NumValuesPerNode: 100
ReturnBounds: False

HistoryData: ExtensionObject
TypeId: NodeId
EncodingMask: 0x01, has binary body
HistoryData: HistoryData
DataValues: Array of DataValue
ArraySize: 1000
[0]: DataValue
[1]: DataValue
….
[999]: DataValue

So my question, is the numValuesPerNode more or less a suggestion to the server, and the server decides how many nodes it will return?

Thank you