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Re: [gpsd-dev] interest in new sentences: VTG, TTM

From: Gary E. Miller
Subject: Re: [gpsd-dev] interest in new sentences: VTG, TTM
Date: Wed, 31 Jan 2018 09:35:00 -0800

Yo teyrana!

On Wed, 31 Jan 2018 10:20:12 -0500
teyrana <address@hidden> wrote:

> Would you (or the list) clarify the expected behavior for grouping
> + ( GGP || RMC ) messsages?

Well, it depends...  You can look at what other drivers do with similar data.
Our usuall approach is to just try something and see how we like it.

> Are y'all okay with writing a separate TPV message for each VTG? Or
> should output await GGA || RMC ?  If so, which sentences should be
> awaited before sending the cached values?

Usually messages are grouped by time stamp and category.  For example
the SKY messages usually do not come every second, but the RMC usually
does.  And the consumer that care about TPV is usually less interested
in SKY, and vice versa.

So, guessing out loud here, if the VTG messages come every second,
with the xame time stamp as an RMC message, I'd say put them together.


Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        address@hidden  Tel:+1 541 382 8588

            Veritas liberabit vos. -- Quid est veritas?
    "If you can’t measure it, you can’t improve it." - Lord Kelvin

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