Re: [gpsd-users] GPSD Client Connected to Remote GPSD - Unrecognized request "" when running gpsmon

[Gary E. Miller]

Yo Florian!

On Wed, 6 Jun 2018 08:29:27 +0200
Florian Petry <address@hidden> wrote:

> Also check this thread. 
> https://lists.gnu.org/archive/html/gpsd-users/2017-09/msg00006.html

Yes, it mentions a fix, but the thread does not have the fix.  Have you
found a fix?  I'd love to have a fix that works.  I'd apply it right away.

> We also want to use gpsd in the "master/slave"  configuration,
> because we have a flexible use case where systems are either in a lab
> with no gps coverage with their own antenna and are using a "gps
> server" (system with an outdoor antenna that provides gpsd with -G)
> or outdoors where they can use real gps.

You do not need master slave to solve that.  Just have the clients
inside coenct to the outside gpsd.  Very common configuration.

> The change can easily be managed by re-configuring the local gpsd 
> instead of configuring n client applications.

Except master/slave never, ever, worked.  I checked the git log all
the way back.  So 'easily' becomes impossible without new code.

> And we also stumbled over the "unrecognized request" problem. In this 
> case it has nothing to do with systemd or the distro packages.

Yup.  But if we do get a working patch it will be years before some
un-named distros pick it up. So the only solution that can work quickly
is to get a patch for git head, and run the git head code.

> As 
> mentioned, it is just a bug in gpsd and is not fixed in git head so
> no matter what distro or init system we/you use, master/slave will
> sadly not work atm.

Yup.  Not just atm, never worked.

> We helped ourselves with streaming gps to a UDP socket which gpsd
> picks up fine (gps2udp).

Another, of many, easy ways to not need the master/slave mode that has
never worked.  Maybe you can detail that solution here and get Joshua
going?

Last time I dug into master/slave I also found out that the gpsd man
page mentions specifying multiple GPS over the gpsd:// link, but there
is zero code to support that.  That was another part of Joshua's
problem.

To sum up, for Joshua to get what he wants:
    1. move to git head code
    2. add patch to make master/slave work
    3. add new code to implement multiple devices over master/slave

Since Joshua is not moving to git head (#1), no point stressing
over #2, and #3 will be a fair bit of work.  If a lost patch is found
I'll apply it right away.

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

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