Timestamp Precision Question - UDP Parameter Data Link

[Simon V]

Hello,

I am currently sending JSONs to the UDP parameter data link, which contain ISO string timestamps for generation time.
In the UdpParameterDataLink.java code I notice that this generation time is stored in a long, then is passed into the ParameterValue object with setGenerationTime().

My question is: is my ISO timestamp saved with picosecond precision within YAMCS (as an Instant)? Or is the timestamp being rounded to millisecond precision? 

Thank you so much,
Simon

[Nicolae Mihalache]

The generation time is rounded (or maybe truncated) to millisecond precision.

The picosecond resolution Instant is not used much in Yamcs. I think it is only used for the Earth Reception Time (ert) which is a timestamp sometimes offered by ground-stations recording the frame reception. 

When java will adopt value objects and classes (which will make the hres timestamp take 12 bytes instead of 28 bytes + dereference operation it takes now) then we may use it more widely.

https://openjdk.org/jeps/8277163

nicolae

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