Re: [gpsd-users] Changing the GPS update rate with gpsd

[Deven Hickingbotham]

On 3/13/2016 1:15 PM, Bo Berglund wrote:
> > >You may be correct on the kernel issue.
> > >
> > >However, my thinking was that on both Wheezy and Jessie I can change
> > >the GPS update rate.  I wrote a Python app that does this and I can see
> > >the confirmation response code and see the packets speed up or slow
> > >down.  All of this is done through /dev/ttyAMA0.  It is only when I
> > >restart gpsd that things go wrong under Jessie and 3.11.  So my
> > >suspicion was that gpsd might be now resetting the GPS in 3.11.

> Or your script might not actually be able to do what you think it does
> if invoked by systemd during startup of Jessie...

Right now none of this is in a script.  I'm just executing commands in
the terminal with plenty of time between commands.  Something like:

sudo service gpsd stop
execute script or Python app to change GPS update rate
confirm update rate has changed
wait
sudo service gpsd start
cgps -s (and observe the update rate)

Under Wheezy and gpsd 3.6 this works.  Under Jessie and gpsd 3.11 it
does not work.  Same results using an identical Pi.

There has been a suggestion that it is a Jessie issue.  Perhaps so, but
I just don't see why the OS would be resetting the GPS update rate???

I tried to be clever and install gpsd 3.6 under Jessie.  This exceeded
my skill level ;-)