Re: GSV strings not being parsed?

[Gary E. Miller]

Yo Ben!

On Wed, 15 Feb 2023 21:17:00 +0000
Ben Barker <ben@bbarker.co.uk> wrote:

> Interesting. Running gpsd in debug mode shows me:

Not interesting enough.  No indication why the GSV is ignored.  Maybe
bump it up to -D 7.  A newer gpsd would show better logging.

Also, the raw.log is what I really need.

> tcpdump for the incoming UDP broadcast shows:

Not helpful.  I still need to know what the dots are.  Sending the
raw.log is best, but I could live with a .pcap.

> Looking at the traffic in wireshark, each of the GPGGA sentances ends
> with 0x0d 0x0a
> The GSV sentances terminate only with 0x0d

NMEA 3.0.1, Section 5.3.1 is clear.  Messages must end with <CR><LF>

> It seems likely you are expecting two bytes, and not getting them,
> for the GSV messages....

Yup.  Also, those strings of NULs (0x00) are concerning.

> 0000   ff ff ff ff ff ff 00 21 32 01 e0 cf 08 00 45 00
> .......!2.....E.

Your od dump is corrupted.  Please attach raw.log to list emails.
Attachments don't get mungned, by you, or the list server.

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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