Should calling HistoryReadRaw function with UNSPECIFIED EndTime return continuation points|OPC UA Standard|Forum|OPC Foundation

Hi,

Suppose we have values stored at 5:00, 5:02, 5:03, 5:05 and 5:06.

If we call HistoryReadRaw with parameters as following:

HistoryReadDetails = {

    StartTime: 5:00,

    EndTime:  UNSPECIFIED,

    NumValuesPerNode: 1,

    returnBounds: true

}

What ContinuationPoint.length of result should be? Greater than 0?

And I was confused when reading Compliance Test Tool’s scripts.

In C:\PATH_OF_CTT\UA 1.02\Compliance Test Tool\ServerProjects\Standard\maintree\History\Historical Access Read Raw\Test Cases folder,

Case 014.js

if( CUVariables.Debug ) print( “
TEST 5: no endTime and 1 value per response
” );
haparams.HistoryReadDetails.EndTime = new UaDateTime();
haparams.HistoryReadDetails.StartTime = CUVariables.Items[0].FirstValueInHistory.SourceTimestamp;
haparams.HistoryReadDetails.NumValuesPerNode = 1;
for( var i=0; i<DATESKIP; i++ ) {
…
  if( Assert.True( HistoryReadHelper.Execute( haparams ), “HistoryRead() success expected.” ) ) {
…
    if( i < DATESKIP ) if( !Assert.GreaterThan( 0, HistoryReadHelper.Response.Results[0].ContinuationPoint.length, “Wrong, no continuationPoint received.”, “Correct, continuationPoint received.” ) ) {
      result = false;
      break;
    }
  } else result = false;
}

Case 016.js

const NUMVALUESPERNODE = 5;
var haparams = {
NodesToRead: CUVariables.Items[0],
HistoryReadDetails: UaReadRawModifiedDetails.New(
  { IsReadModified: false,
    StartTime: CUVariables.Items[0].FirstValueInHistory.SourceTimestamp,
    EndTime: new UaDateTime(),
    NumValuesPerNode: NUMVALUESPERNODE,
    ReturnBounds: true } ),
TimestampsToReturn: TimestampsToReturn.Source,
ReleaseContinuationPoints: false,
Debug: CUVariables.Debug };

var result = true;

// start/end bounds are valid, one node per response, request bounds; read until EOF
if( Assert.True( HistoryReadHelper.Execute( haparams ), “HistoryRead() success expected.” ) ) {
…
} else result = false;
if( !Assert.Equal( 0, HistoryReadHelper.Response.Results[0].ContinuationPoint.length, “Wrong, ContinuationPoint received when it should be the end of the record.”, “Correct, ContinuationPoint not received.” ) ) result = false;