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[aprssig] Object Timestamps and 111111

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Sun Dec 12 21:36:06 UTC 2010


Ok, so that's where the 111111 came from.  Is it actually written down 
somewhere that new APRS implementations can learn about it?.

What about the h format vs the z format, both of which seem to be valid 
according to aprs101.pdf?

And what does the timestamp actually MEAN?  Is it simply a timestamp of 
the object's transmission?  a date/time that the object is particularly 
interested in?   an expiration time?

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32

PS.  I hate to ask so many questions, but the devil is in the details.

Bob Bruninga wrote:
>>> Any pointers to the definition of the timestamp 
>>> on object packets, especially the spec of the 
>>> 111111 special value...
>>>       
>
> Its a crutch for UIview that cannot be fixed.  We needed a NULL value for the date/time stamp for objects that are either permanent or the source has no clock.  We tried 000000z, but UIview then completely ignores the object.  Not good.
>
> So, the only thing we can do is come up with another value.  We chose 111111z as an easy to recognize null value.
>
> Bob, WB4APR
>
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