Re: How do you access UBX MON-HW messages in a gpsd client

[Gary E. Miller]

Yo Thomas!

On Sun, 17 Mar 2024 14:46:36 +0000
Thomas Giglia <tgiglia@hotmail.com> wrote:

> The output from gpsdebuginfo is attached to this email.

> + gpsd -V
> gpsd: 3.22 (revision 3.22)

That is pretty old.  We can't support code that old.

Version 3.35 is current.

> # Magic Hat enabled

Are you on a reapberry pi?  You only need this if you use /dev/ttyAMA0,
but you use /dev/ttyS0.

> /usr/sbin/gpsd -n /dev/ttyS0 /dev/pps0

WHy do you have /dev/pps0 on your command line?  Do you really have a
separate PPS device, like on a raspberry pi?

> {"class":"DEVICE","path":"/dev/ttyS0","driver":"u-blox",
> "subtype":"SW 7.03 (45969),HW 00040007",
> "activated":"2024-03-17T14:38:02.390Z","flags":1,"native":1,
> "bps":9600,"parity":"N","stopbits":1,"cycle":1.00,"mincycle":0.02}

Looks like a "newer" u-blox 6, Only 11 years old.  With the "newer"
7.03 firmware.  This is important below..

Don;t enable a lot of extra messages, the 9600 can't handle them.

> Is the raw data from the UBLOX stored inside gpd_data_t? If so which
> field has it?

Yes, the ubx raw data is parsed, and then stored into individual parts.
For example, latitude is in (gps_data_t*)->fix.latitude.  The antenna
state is in (gps_data_t*_->fix.antenna.

> "Can you use the git master for gpsd?"
> Sure I don't see why not.

Please give it a try. u-blox has at least 4 different versions of
UBX-MON-HW, and your 3.22 (gpsd and ubxtool) only decodes one of them.
One yours does not do.  Maybe fixed in git head.

The new code has UBX-MON-HW sent every 4 epochs for protVer < 27.  For
newer devices UBX-MON-RF is sent.  The antenna status is then hooked to
the gpsd JSON output.

I still need to look at the jamming.  The UBX-MON-HW outputs two:
    jamState  0 to 4
    jamInd    0 to 255

Which were you looking to get?  Earlier u-blox 6 do not support jamState,
but do support the more granular jamInd.  So I thinking of only supporting
jamInd.

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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