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PubSub: Only a Single DataSet per PubSubUdpUadpConnectionNetworkMessage
June 18, 2026
15:32, EEST
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hbrackel
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February 21, 2014
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Good day,

I have configured 2 DataSetWriters in a single WriterGroup (using the same publishingInterval). The UadpNetworkMessageContentMask does NOT contain the DataSetClassId (i.e. it is null). The DataSets only comprise 2 and 3 double values, respectively, which should fit well into the maxMessageSize of 4096 bytes.

What could be the reason for sending multiple networkmessages with one dataSet each instead of one networkMessage containing the dataSets from both dataSetWriters?

Some shortened log messages below. My expectation would be that a single networkmessage would transport both dataSets (dataSetWriterIds=[1,2]). Could this be related to the issue of the dataSet seqNos counting across all dataSetMessages? (see previous forum entry)

INFO XXXXXService – PubSubUdpUadpConnectionNetworkMessageReceivedEvent: seqNo=346, publisherId=String:yyyy::1/1, writerGroupId=1, dataSetClassId=null, dataSetWriterIds=[2], dataSetMessageCount=1
INFO XXXXXService – PubSubUdpUadpConnectionNetworkMessageReceivedEvent: seqNo=347, publisherId=String:yyyy::1/1, writerGroupId=1, dataSetClassId=null, dataSetWriterIds=[1], dataSetMessageCount=1
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