[LinuxPPS] Synchronizing a ZDA message with NTP using linuxPPS

[Divi.Oillo at ifremer.fr]

Hi

Here is my new ntp.conf (NMEA disabled + stratum 15 on local clock)

------------------------------------------------------------
#Undisciplined Local Clock
server 127.127.1.0
fudge 127.127.1.0 stratum 15

#Generic NMEA GPS Receiver
#server 127.127.20.0 mode 8 minpoll 4 maxpoll 16 prefer
#fudge 127.127.20.0 flag1 1 flag2 0 flag3 1

#PPS Clock Discipline
server 127.127.22.0 minpoll 4 maxpoll 16
fudge 127.127.22.0 flag2 0 flag3 1

#134.246.11.121
server ntpserver minpoll 4 maxpoll 16 prefer
-------------------------------------------------------------

ldattach 18 /dev/ttyS0

sudo ./ppstest /dev/pps0
trying PPS source "/dev/pps0"
found PPS source "/dev/pps0"
ok, found 1 source(s), now start fetching data...
source 0 - assert 1269202324.429792497, sequence: 19 - clear   
1269202324.929765692, sequence: 19
source 0 - assert 1269202325.429609642, sequence: 20 - clear   
1269202324.929765692, sequence: 19
source 0 - assert 1269202325.429609642, sequence: 20 - clear   
1269202325.929522149, sequence: 20
source 0 - assert 1269202326.429642163, sequence: 21 - clear   
1269202325.929522149, sequence: 20

techsas:> cat /sys/devices/virtual/pps/pps*/assert
1269202380.425496211#75
techsas:> cat /sys/devices/virtual/pps/pps*/assert
1269202382.425170657#77

techsas:> sudo ntpd

techsas:> ntpq -pn
      remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
*127.127.1.0     .LOCL.          15 l   37   64   17    0.000    0.000   0.001
x127.127.22.0    .PPS.            0 l    4   16  377    0.000  -403.35   5.537
x134.246.11.121  .1PPS.           1 u   63   64   37    0.187   80.869   5.745

It seems that PPS works?

but sometimes I have:
techsas:> sudo ./ppstest /dev/pps0
trying PPS source "/dev/pps0"
found PPS source "/dev/pps0"
ok, found 1 source(s), now start fetching data...
time_pps_fetch() error -1 (Connection timed out)
time_pps_fetch() error -1 (Connection timed out)

And I need to kill ldattach and restart it (ldattach 18 /dev/ttyS0)

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