Re: gpsd losing connection to ublox

[Niall Parker]

On 2021-11-09 2:21 p.m., Gary E. Miller wrote
> On Tue, 9 Nov 2021 14:15:52 -0800
> Niall Parker <stuff@npengineering.ca> wrote:
>
> > On 2021-11-09 10:38 a.m., Gary E. Miller wrote:
> > > You could try forcing the port speed (-s)
> > Bingo, thank you sir !
> >
> > Everything is much better behaved with -s 115200 in GPSD_OPTIONS
> >
> > Without it, ubxtool wouldn't even recognize the GPS and the debug log
> > was full of serial speed probe attempts. Occasionally it would find
> > it OK, get data but then lose it again.
> I think this is fixed in git head. Would be nice if you can test.

Built latest and gave it a try. Still getting the loss of connection if 
I don't specify the speed, with the additional problem that PPS is N/A 
in gpsmon, even if I leave it a while (whereas the 3.23.1 release picks 
it up right away)

ppstest works the same whether from 3.23.1 or 
release-3.23.1-121-g16692c767 and using same config files so something 
broke with PPS in the latest

My ntpd isn't using PPS though, even after a 12 hour run to settle. I 
had the polarity wrong initially but after fixing that in the device 
tree and seeing a much lower offset it wasn't enough for ntpd to regard 
as sane. Is this my fudge value out of whack ?

Still something to fix, what is the best approach to determine a good 
fudge value ?

            ... Niall