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[aprssig] Re: [CA APRS] Re: Puzzled

Bob Bruninga bruninga at usna.edu
Wed Sep 22 00:02:37 UTC 2004


On Tue, 21 Sep 2004, AE5PL Lists wrote:

> Some applications are not intolerant of those characters because of the
> packet mangling that has occurred over the years.  Nowhere in the
> specification, to my knowledge, does it say that these are case
> intolerant.  They are not case insensitive in NMEA strings.
>
> I believe UI-View, APRS+SA, javAPRS, and others sanity check these
> characters; so no, making them lower case is not backwards compatible.

The proposal is to make them case insensitive so that we can use that
bit.  That still leaves a 127 out of 128 probability of a proper "sanity"
check.  A very tiny price to pay for the added knowledge of whose
stations are manned versus those that are just burning up air time...

Bob, WB4APR

> >
73, >
> Pete Loveall AE5PL
> mailto:pete at ae5pl.net
>
> > -----Original Message-----
> > From: Bob Bruninga
> > Posted At: Tuesday, September 21, 2004 6:22 PM
> > Subject: [aprssig] Re: [CA APRS] Re: Puzzled
> >
> > > My guess is the lowercase 'n' in the position.  Should be uppercase.
> >
> > APRS programs are supposed to be tolerant of both cases for
> > the N/S byte.  Hence a few years ago it was prposed that the
> >
> > This was proposed for APRS a year or so ago and some APRS
> > programs have implemented it since all programs are supposed
> > to be indifferent to case in that byte anway.  Thus it should
> > be fully backwards compatible.
> >
> > But maybe we have found somne applications that are not
> > intolerant to that byte?
>
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de WB4APR at amsat.org, Bob

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