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Re: [gpsd-dev] RFC - drop "tag" fields from the public interface

From: Hal Murray
Subject: Re: [gpsd-dev] RFC - drop "tag" fields from the public interface
Date: Sat, 23 Aug 2014 22:30:07 -0700

> The "tag" field in JSON reports is a historical relic from before the design
> of the JSON protocol, back when there was fairly close correspondence
> between one GPS sentence in and one GPSD report sentence out. 

> Now that JSON reports correspond to the last GPS sentence in some group
> composed to gather all their information, that correspondence is gone.  In
> the NMEA case, for example, a TPV is composed from up to four sentences and
> the tag only tells us which one happened to arrive last. 

How does Watch work today?  How does/will it work for the timing case?  There 
are several NMEA sentences that provide timing.  If the transmitter is 
stable, it would help to get the time from the same sentence type each time.

These are my opinions.  I hate spam.

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