[gpsd-users] problem with Stratum-1-Microserver HOWTO

[Charles Muggen]

I am using an Adafruit GPS HAT on a Raspberry Pi 3 running Raspbian Stretch 
Lite.
The goal is to setup an accurate time service with no Internet connection.

I painstakingly followed the procedure outlined in Stratum-1-Microserver HOWTO.
  https://www.ntpsec.org/white-papers/stratum-1-microserver-howto/

Here's the problem.

I can run gpsmon using the command:
  sudo ./gpsd/gpsmon /dev/gpsd0

I see PPS bars as described:
  ------------------------------------- PPS 
-------------------------------------

but if I run ntpshmmon using:
  sudo ./gpsd/gpsd /dev/gpsd0
  sudo ./gpsd/ntpshmmon

I get maybe 1 line, sometimes no lines of time samples. No repetition. It just 
sits there.
  ntpshmmon version 1
  #      Name Seen@                Clock                Real                 L 
Prec
  sample NTP0 1518122608.242784463 1518121774.542185892 1518121774.000000000 0  
-1

I did the Build and Configure NTPsec earlier.

Then if I run the NTPsec smoke test
  sudo systemctl stop ntp
  sudo ./gpsd/gpsd /dev/gpsd0
  sudo ./ntpsec/build/main/ntpd/ntpd -g -c ntp.conf

I get the following:
  02-08T15:46:22 ntpd[818]: INIT: ntpd ntpsec-1.0.1+289 2018-02-06T11:22:22Z: 
Starting
  02-08T15:46:22 ntpd[818]: INIT: Command line: ./ntpsec/build/main/ntpd/ntpd 
-g -c ntp.conf

If I follow up with:
  sudo ./gpsd/ntpshmmon

I get the following:
  ntpshmmon version 1
  #      Name Seen@                Clock                Real                 L 
Prec

This time it produced no time samples.

I can go back and run
  sudo ./gpsd/gpsmon /dev/gpsd0

I see PPS bars as described
------------------------------------- PPS -------------------------------------


and if I run:
  ./ntpsec/build/main/ntpclients/ntpq -p   (ntpq -p at the home prompt works 
too)

I get the following:

       remote           refid      st t when poll reach   delay   offset  jitter
  ==============================================================================
   SHM(1)          .PPS.            0 l    -   64    0    0.000    0.000   0.002
   SHM(0)          .GPS.            0 l    -   64    0    0.000    0.000   0.002
   us.pool.ntp.org .POOL.          16 p    - 1024    0    0.000    0.000   0.002

What could be wrong?
Is NTP connected to my GPS receiver and receiving GPS time messages?