Re: How to get raw data from gpsd?

[Gary E. Miller]

Yo 张延涛!

On Fri, 22 Mar 2024 22:52:33 +0800
张延涛 <zh6tao@gmail.com> wrote:

> I am currently working on gpsd 3.25

Cool.  What GNSS receiver?

> and want to get the raw data that
> gpsd reads from the serial port. The raw data includes binary data,
> NMEA data, and other non-NMEA type textual data. I would like to know
> if gpsd has an API that allows me to call and obtain the raw data?

The quick way is "gpspipe -R".  The API way it to do a ?WATCH and
ask for superraw mode.

> Before asking this question, I have already tried the following:
> 
> - Using `gpspipe -R` I found that I could not get any data types
> other than NMEA sentences;

"gpspipe -R" sends whatever come in the serial port.  If all you see
is NMEA, then that is all your receiver is sending.

You can use wireshark to confirm

> - Using the `gps_read()` function, I could not obtain the raw data
> either.

Ditto my last comment.

If you can send ut the first 60 seconds of your gpsd log that will
answer many questions.  Do it this way:

    gpsd -nND 6 /dev/ttyS0 > gpsd.log 2>&1

Let that run 60 seconds, the send us gpsd.log.

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        gem@rellim.com  Tel:+1 541 382 8588

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    "If you can't measure it, you can't improve it." - Lord Kelvin

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