Re: Problems with miss-behaving uBlox Module

[Gary E. Miller]

Yo Neustifter!

On Mon, 29 Mar 2021 17:49:36 +0000
Neustifter Andreas <Andreas.Neustifter@kapsch.net> wrote:

> we experienced windows of about 5-7 seconds where no data from GPSd
> (via the IP interface at port 2947) was received when GPSd is
> connected to our uBlox (NEO M8N, SPG 3.01, EXT CORE 3.01 (107900),
> Protocol 18.00) modules.

Ouch.

What gpsd version?  How was it built?

> After investigations with strace we found that the UBX-NAV-PVT
> message sometimes reports a length of zero. This leads to the lexer
> not working and the lexer-buffer filling up until an error occurs and
> the buffer is reset. Attached a strace output of an offending message.

The lexer should be able to handle UBX lenght zero.  Can you provide
a serial capture of the u-blox binary stream doing that?

> We currently believe this to be a bug in the firmware of our modules
> but are checking with uBlox.

Good luck with that.  AFAIK the sum mtotal of bugs they acknowledged from
gpsd users is one.

> Has anyone else experienced this kind of issues?

Not me.

> The information contained in this e-mail message is privileged and
> confidential and is for the exclusive use of the addressee.

Seriously?  You know this is a public email list with public archives?

RGDS
GARY
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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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