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Re: [Diagnosed]: Timeservice not running on Ubuntu 16.04
From: |
Gary E. Miller |
Subject: |
Re: [Diagnosed]: Timeservice not running on Ubuntu 16.04 |
Date: |
Fri, 5 Jun 2020 15:28:26 -0700 |
Yo Dan!
On Fri, 5 Jun 2020 18:05:13 -0400
Dan Williams <dwilliams@nextdroid.com> wrote:
> It required quite a few fixes, primarily verifying that all
> received sentences were reporting good fixes.
In gpsd land we call this: having a valid 3D fix.
> - GPSD will not *Tell* you that these fixes are bad,
gpsd is not a client. That is why the procedure says to look with
cgps to see that you have a valid fix. All the client tell you if you
have a valid fix.
> NOR that
> it's why PPS won't output. not even in debug level 6
I showed you in your debug logs where gpsd shows that.
Simple rule: No fix, no valid PVT.
That is why the procedures tell you to verify you had a fix before
proceeding to PPS.
gpsd tries hard to ensure that garbage in does not yield garbage out.
> - Lesson 3: GPSD can report a PPS signal to "gpsmon" without being in
> root.
Or rather, gpsmon can not open /dev/pps0 without being root. But
that is distro/permission dependent.
> - Lesson 4: gpsd will fail back to ioctl mechanism even if it's run
> as root and has access to KPPS. Even if your KPPS setup is faulty.
By design, as documented.
> - Lesson 5: The PPS errors "missing last_fixtime" do not prevent a
> pps fix. (visible at debug level 5 and above)
Correct, but the pps fix is not valid, so not used. gpsd only uses
valid data.
> The gps receiver and computer I'm trying to set up are mounted on a
> vehicle, and I was debugging while parked.
Parked inside with bad skyview? You logs only showed 3 sats in sight,
not enough for a 3D fix.
> Unfortunately for me, the GPS receiver (and IMU) only output valid
> sentences while it's calibrated, which effectively means: "while it's
> driving".
That would be a pretty bad bug in the oxts.
> For instance, our receiver can see 6 satellites, report 1m DOP,
No way you get 1m DOP with only 6 sats. That would be another bug in
your oxts.
> and
> still not have a "valid" fix -- because it's waiting until the IMU &
> accelerometers are valid before reporting a valid fix.
That would be another bug in your receiver.
RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
gem@rellim.com Tel:+1 541 382 8588
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- Re: Build Errors with Timeservice + Ubuntu 16.04, (continued)
- Re: Build Errors with Timeservice + Ubuntu 16.04, Gary E. Miller, 2020/06/03
- Re: Build Errors with Timeservice + Ubuntu 16.04, Dan Williams, 2020/06/04
- Re: Build Errors with Timeservice + Ubuntu 16.04, Gary E. Miller, 2020/06/04
- Re: Build Errors with Timeservice + Ubuntu 16.04, Gary E. Miller, 2020/06/04
- Re: Build Errors with Timeservice + Ubuntu 16.04, Frank Nicholas, 2020/06/04
- Re: Build Errors with Timeservice + Ubuntu 16.04, Gary E. Miller, 2020/06/04
- Message not available
- Re: Build Errors with Timeservice + Ubuntu 16.04, Gary E. Miller, 2020/06/04
- Message not available
- [Diagnosed]: Timeservice not running on Ubuntu 16.04, Dan Williams, 2020/06/05
- Re: [Diagnosed]: Timeservice not running on Ubuntu 16.04, Gary E. Miller, 2020/06/05
- Re: [Diagnosed]: Timeservice not running on Ubuntu 16.04, Dan Williams, 2020/06/05
- Re: [Diagnosed]: Timeservice not running on Ubuntu 16.04,
Gary E. Miller <=
- Re: [Diagnosed]: Timeservice not running on Ubuntu 16.04, Sanktwo, 2020/06/06
- Re: [Diagnosed]: Timeservice not running on Ubuntu 16.04, Dan Williams, 2020/06/06
- Re: [Diagnosed]: Timeservice not running on Ubuntu 16.04, Gary E. Miller, 2020/06/06
- Re: [Diagnosed]: Timeservice not running on Ubuntu 16.04, Greg Troxel, 2020/06/06
- Re: [Diagnosed]: Timeservice not running on Ubuntu 16.04, Gary E. Miller, 2020/06/06