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 1592930096.098507152, sequence: 2201 - clear 0.000000000, sequence: 0
source 0 - assert 1592930097.098506672, sequence: 2202 - clear 0.000000000, sequence: 0
source 0 - assert 1592930098.098506960, sequence: 2203 - clear 0.000000000, sequence: 0
source 0 - assert 1592930099.098506864, sequence: 2204 - clear 0.000000000, sequence: 0
source 0 - assert 1592930100.098507248, sequence: 2205 - clear 0.000000000, sequence: 0
source 0 - assert 1592930101.098506928, sequence: 2206 - clear 0.000000000, sequence: 0
source 0 - assert 1592930102.098506512, sequence: 2207 - clear 0.000000000, sequence: 0
source 0 - assert 1592930103.098506576, sequence: 2208 - clear 0.000000000, sequence: 0
source 0 - assert 1592930104.098508944, sequence: 2209 - clear 0.000000000, sequence: 0
ls /dev/gps
gps0 gpspps0
cat /dev/ttyTHS0
the latter seems failed; other two checks suceeded