Re: [gpsd-users] Communicating NMEA to gpsd as if my software was a GPS device

[Gary E. Miller]

Yo Ellon!

On Wed, 4 Sep 2019 10:34:58 +0200
Ellon Paiva <address@hidden> wrote:

> Based on gpsd manual pages, it was decided my "GPS device" would 
> communicate to gpsd through UDP or TCP feed using NMEA sentences.

I looked at your sample file some more.  I thought you would like to
know how wrong some of your "NMEA" is.

For example:

$GPGGA,103642.879013,4850.432180742773,N,226.381659556439,E,7,08,,0,M,0,M,,*73

Field 1, time of measurement: 103642.879013
NMEA only allows 2 digits past the decimal point.  Some GPS use 3.

Field 2, latitude: 4850.432180742773
NMEA only allows 2 digits past the decimal point.  Some GPS use 3 or 4.


Field 4, longitude: 226.381659556439
Seriously, 226 degrees east?  NMEA range is +/- 180.
NMEA only allows 2 digits past the decimal point.  Some GPS use 3 or 4.

Field 10, HDOP.  Missing.

Field 11, altitude: 0
Missing decimal point.

Field 13, geoid separation: 0
Zero?  Really???
Missing decimal point.

Other sentences similarly non-compliant...

These will make a good example of things gpsd should detect and
complain about.


RGDS
GARY
---------------------------------------------------------------------------
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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