Re: gps feed from socat

[Nick Taylor]

Hi there

On 26/10/2021 18:23, Gary E. Miller wrote:
> Yo Nick!
>
> On Tue, 26 Oct 2021 13:47:16 +0100
> Nick Taylor <nicktaylor@dataskill.uk> wrote:
>
> > Doing some testing on the latest 3.23.2~dev and noticed that cgps
> > appears to glitch with altitude coming and going.
> Yes, unavoidable with NMEA.
>
> > Tried using a feed from socat calling gpspipe  as per docs and also
> > using kplex which provides a raw feed from my gps device
> OK.
>
> > The raw feed doesn't seem to glitch but the socat one does. Note that
> > my gpsd on the server providing feed is v3.22 but I wouldn't expect
> > that to cause glitch?
> Not much I can say without data captures.
>
> And remember, the scoat example is pusedo-NMEA, not NMEA, so it will not
> match your NMEA exactly.
>
> > Attaching 2 feed samples captured on dest machine using gpspipe -r in
> > case anyone can spot anything strange there...
> No good, I need 'gpspipe -R" to see, I need the raw data, not the psuedo
> NMEA after being processed a 2nd time as speudo NMEA.
New raw dumps attached
> Also helpful would be a descriont of the real GPS model and how it is
> configured.
Feed in this case is from Huawei ME936 modem/GPS module.

In the case of the socat feed via gpsd-3.22, but the kplex takes raw 
feed from the usb serial device and passes it out as tcp NMEA stream.
I'm not actually that bothered about this - just thought it was strange.

Let me know if any other dumps etc would help

Cheers

Nick

gpspipe-from-kplex-raw.log
Description: Text document

gpspipe-from-socat-raw.log
Description: Text document