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Re: Getting timeout error while reading data.

From: Gary E. Miller
Subject: Re: Getting timeout error while reading data.
Date: Sat, 16 Jul 2022 21:37:59 -0700

Yo Bhavna!

On Sun, 17 Jul 2022 09:59:51 +0530
Bhavna Harani <> wrote:
From: "Gary E. Miller" <>
To: Bhavna Harani <>
Subject: Re: Getting timeout error while reading data.
Date: Sat, 16 Jul 2022 11:49:21 -0700
Organization: Rellim

Yo Bhavna!

On Sat, 16 Jul 2022 18:27:27 +0530
Bhavna Harani <> wrote:

> > I am giving data dynamically to gpsd over udp by the below command.
> > gpsd -D 1 -n udp://    
> You skipped over some important lot of details.  What version of gpsd?
> What is
> the source for "udp://"
> version: 3.24.1  

There is no 3.24.1 yet.  I assume you compiled yourself from git?
> source : created client application which write raw NEMA packet at

What version of NMEA?

Can you share the source?  Or some of its output?

> > every 1 second I am feeding data to udp socket.    
> How?  What sort of data?
> 1083 NEMA string ,there is some utility which generates sample data.  

Ugh.  We have found many broken NMEA simulators.

> > When I tried to read
> > the data
> > using gpslib I got a timeout error.    
> Getting way ahead of yourself.  Don't bother to touch libgps until
>  the "-D 4" log from gpsd looks good.  Then move on to cgps, befoure
> looking at libgps.
> ok  

And what did you see?


> >  I have tried with "gpspipe -r" ,I was able to get a raw string
> > which I parsed dynamically.    
> Your C code asks for JSON, but you compare to psuedo NMEA.  Apples and
> oranges.
> - I was checking the gpspipe client  and my client application.
> gpspipe client
> was getting data (in both options -w  -r) ,my client application got
> timeout.  

When gpspipe gives good data, but your client does not work, that pretty
much narrows it down to your client.  That "-D 4" log might help.

Care to share what gpspipe showed you?  My mind reading is flakey today.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703  Tel:+1 541 382 8588

            Veritas liberabit vos. -- Quid est veritas?
    "If you can't measure it, you can't improve it." - Lord Kelvin

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