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Question on parsing Data Key Frame DataSetMessage

Jothi Sankarraj

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04/09/2019

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08/20/2019 - 10:06

I’m in the process of decoding / parsing the Data Key Frame DataSetMessage and I have a few questions!

Q1. In the Figure 30 – Data Key Frame DataSetMessage Data, it says that the DataSetMessages Header consists just of the following elements:

DataSetFlags1
DataSetFlags2
SequenceNumber

But the page before this one Figure 29 – DataSetMessage Header Structure, there are more fields as below:

DataSetFlags1
DataSetFlags2
MessageSequenceNumber
Timestamp
Picoseconds
StatusCode
MajorVersion
MinorVersion

So my question now is if I’m parsing a Data Key Frame, then I have to stick to the contents of Figure 30? The Spec is a bit misleading with these repetitive Figures!

Randy Armstrong

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08/20/2019 - 16:21

There is only one header with optional fields and bits to indicate which fields are present.

The different examples show different headers with different fields. Your code needs to interpret the DataSetFlags1 and DataSetFlags2 and extract the fields which are present.

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