Test NTP

ices@gallifrey:~ $ ntpq -c peers -c rv
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
oPPS(0)          .PPS.            0 l   16   16  377    0.000    0.005   0.002
*SHM(0)          .GPS.            2 l   15   16  377    0.000    4.334   3.659
 194.50.19.3     .INIT.          16 u    - 1024    0    0.000    0.000   0.000
 193.170.62.252  .INIT.          16 u    - 1024    0    0.000    0.000   0.000
 li1487-219.memb .INIT.          16 u  841 1024    0    0.000    0.000   0.000

associd=0 status=01f8 leap_none, sync_pps, 15 events, no_sys_peer,
version="ntpd 4.2.8p12@1.3728-o (1)", processor="armv7l",
system="Linux/4.19.58-v7+", leap=00, stratum=1, precision=-19,
rootdelay=0.000, rootdisp=1.000, refid=PPS,
reftime=e10020ef.6b549b3f  Thu, Aug 15 2019 20:20:31.419,
clock=e10020ef.7ffc20bf  Thu, Aug 15 2019 20:20:31.499, peer=58555, tc=4,
mintc=3, offset=0.004137, frequency=-4.528, sys_jitter=0.001907,
clk_jitter=0.003, clk_wander=0.004, tai=37, leapsec=201701010000,
expire=201912280000