Re: [gpsd-users] Communication loss with GR-701W

[Benoît Thébaudeau]

Hi Gary,

Le 21/05/2019 à 21:51, Gary E. Miller a écrit :
> On Tue, 21 May 2019 21:29:56 +0200 (CEST)
> Benoît Thébaudeau <address@hidden> wrote:
> 
>>>> Unfortunately, I do not have time to investigate this issue more
>>>> deeply.  
>>>
>>> I don't think that is required, we have long suspected serial
>>> overrun, and your tests mostly confirm that. The only other thing
>>> to try is different serial port speeds to see if that has any
>>> effect.  
>>
>> Unfortunately, there is no flow control mechanism available on this
>> module. Slower baudrates would really be very slow, and the serial
>> overrun leading to the trk tick error seems to be towards the module
>> (on at least one side of the USB link), so faster baudrates would
>> make things worse.
> 
> Think about it all you want, but I just beleive experimental data.
> 
> Please test.

I do not see any major difference at 115200 Bd:

Working case: still a checksum error:
8><-----------------------
gpsd:INFO: launching (Version 3.18.1)
gpsd:IO: opening IPv4 socket
gpsd:IO: opening IPv6 socket
gpsd:INFO: listening on port 2947
gpsd:PROG: NTP: shmat(0,0,0) succeeded, segment 0
gpsd:PROG: NTP: shmat(32769,0,0) succeeded, segment 1
gpsd:PROG: shmget(0x47505344, 14024, 0666) for SHM export succeeded
gpsd:PROG: shmat() for SHM export succeeded, segment 65538
gpsd:INFO: stashing device /dev/ttyUSB0 at slot 0
gpsd:PROG: no /etc/gpsd/device-hook present, skipped running ACTIVATE hook
gpsd:INFO: SER: opening GPS data source type 3 at '/dev/ttyUSB0'
gpsd:INFO: SER: speed 115200, 8N1
gpsd:PROG: no probe matched...
gpsd:INFO: gpsd_activate(2): activated GPS (fd 5)
gpsd:PROG: PPS:/dev/ttyUSB0 chrony socket /var/run/chrony.ttyUSB0.sock doesn't 
exist
gpsd:PROG: KPPS:/dev/ttyUSB0 checking /sys/devices/virtual/pps/pps0/path, 
/dev/ttyUSB0
gpsd:INFO: KPPS:/dev/ttyUSB0 RFC2783 path:/dev/pps0, fd is 6
gpsd:INFO: KPPS:/dev/ttyUSB0 pps_caps 0x1133
gpsd:INFO: KPPS:/dev/ttyUSB0 have PPS_CANWAIT
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS will be used
gpsd:PROG: PPS:/dev/ttyUSB0 thread launched
gpsd:INFO: PPS:/dev/ttyUSB0 ntpshm_link_activate: 1
gpsd:INFO: device /dev/ttyUSB0 activated
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Interrupted system call
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Interrupted system call
gpsd:INFO: running with effective group ID 0
gpsd:INFO: running with effective user ID 0
gpsd:INFO: startup at 2019-05-22T10:54:04.000Z (1558522444)
gpsd:PROG: KPPS:/dev/ttyUSB0 assert  0.000000000, sequence: 0, clear   
1558522444.993296862, sequence: 1 - using: clear
gpsd:PROG: KPPS:/dev/ttyUSB0 Clear cycle: 1558522444993296, duration: 
1558522444993296 @  1558522444.993296862
gpsd:PROG: PPS:/dev/ttyUSB0 Clear cycle: 1558522444993296, duration: 
1558522444993296 @  1558522444.993296862
gpsd:PROG: switching to match packet type 1: 
$GPRMC,105405.00,A,4708.40738,N,00141.93911,W,0.189,,220519,,,A*6E\x0d\x0a
gpsd:PROG: switch_driver(NMEA0183) called...
gpsd:PROG: selecting NMEA0183 driver...
gpsd:INFO: /dev/ttyUSB0 identified as type NMEA0183, 1 sec @ 115200bps
gpsd:PROG: => Probing for Garmin NMEA
gpsd:IO: SER: => GPS: $PGRMCE*0E\x0d\x0a
gpsd:IO: <= GPS: 
$GPRMC,105405.00,A,4708.40738,N,00141.93911,W,0.189,,220519,,,A*6E
gpsd:PROG: GPRMC sentence timestamped 105405.00.
gpsd:PROG: GPRMC starts a reporting cycle.
gpsd:PROG: NTP: ntpshm_put(/dev/ttyUSB0,-20)  1558522445.000000000 @  
1558522445.064480881
gpsd:IO: <= GPS: $GPVTG,,T,,M,0.189,N,0.349,K,A*2D
gpsd:WARN: unknown sentence: "$GPVTG,,T,,M,0.189,N,0.349,K,A*2D\x0d\x0a"
gpsd:PROG: => Probing for FV-18
gpsd:IO: SER: => GPS: $PFEC,GPint*58\x0d\x0a
gpsd:IO: <= GPS: 
$GPGGA,105405.00,4708.40738,N,00141.93911,W,1,06,1.71,15.0,M,48.2,M,,*74
gpsd:PROG: GPGGA sentence timestamped 105405.00.
gpsd:PROG: => Probing for Trimble Copernicus
gpsd:IO: SER: => GPS: $PTNLSNM,0139,01*5C\x0d\x0a
gpsd:IO: <= GPS: $GPGSA,A,3,25,29,12,32,02,24,,,,,,,2.60,1.71,1.96*05
gpsd:PROG: xxGSA sets mode 3
gpsd:IO: <= GPS: 
$GPGSV,3,1,10,02,29,062,31,06,08,029,07,12,36,076,35,14,38,262,*7E
gpsd:PROG: Partial satellite data (1 of 3).
gpsd:IO: <= GPS: 
$GPGSV,3,2,10,24,09,140,20,25,74,046,28,26,07,273,,29,69,185,18*79
gpsd:PROG: Partial satellite data (2 of 3).
gpsd:IO: <= GPS: $GPGSV,3,3,10,31,44,304,,32,32,239,15*71
gpsd:PROG: KPPS:/dev/ttyUSB0 assert  1558522445.093228499, sequence: 1, clear   
1558522444.993296862, sequence: 1 - using: assert
gpsd:PROG: KPPS:/dev/ttyUSB0 Assert cycle: 1558522445093228, duration:   99931 
@  1558522445.093228499
gpsd:PROG: PPS:/dev/ttyUSB0 Assert cycle: 1558522445093228, duration:   99931 @ 
 1558522445.093228499
gpsd:PROG: PPS:/dev/ttyUSB0 Assert ignored Too long for 0.5Hz
gpsd:INFO: PRN=  2 az= 62 el=29 (0.772243, 0.410609, 0.484810)
gpsd:INFO: PRN= 12 az= 76 el=36 (0.784986, 0.195719, 0.587785)
gpsd:INFO: PRN= 24 az=140 el= 9 (0.634874, -0.756613, 0.156434)
gpsd:INFO: PRN= 25 az= 46 el=74 (0.198277, 0.191474, 0.961262)
gpsd:INFO: PRN= 29 az=185 el=69 (-0.031234, -0.357004, 0.933580)
gpsd:INFO: PRN= 32 az=239 el=32 (-0.726919, -0.436777, 0.529919)
gpsd:INFO: Sats used (6):
gpsd:PROG: => Probing for UBX
gpsd:PROG: => GPS: UBX class: 06, id: 00, len: 0, crc: 0618
gpsd:IO: SER: => GPS: b562060000000618
gpsd:IO: <= GPS: $GPGLL,4708.40738,N,00141.93911,W,105405.00,A,A*7A
gpsd:PROG: GPGLL sentence timestamped 105405.00.
gpsd:IO: <= GPS: $GPTXT,01,01,01,PGRM inv format*34
gpsd:WARN: TXT: Warning: PGRM inv format
gpsd:IO: <= GPS: $GPTXT,01,01,01,PFEC inv format*2C
gpsd:WARN: TXT: Warning: PFEC inv format
gpsd:IO: <= GPS: $GPTXT,01,01,01,PTNL inv format*3A
gpsd:WARN: TXT: Warning: PTNL inv format
gpsd:IO: UBX: len 28
gpsd:PROG: switching to match packet type 11: 
b5620600140001000000c008000000c201000300030000000000ac5e
gpsd:PROG: switch_driver(u-blox) called...
gpsd:PROG: selecting u-blox driver...
gpsd:INFO: /dev/ttyUSB0 identified as type u-blox, 1 sec @ 115200bps
gpsd:PROG: => GPS: UBX class: 0a, id: 04, len: 0, crc: 0e34
gpsd:IO: SER: => GPS: b5620a0400000e34
gpsd:PROG: => GPS: UBX class: 06, id: 16, len: 8, crc: 31e5
gpsd:IO: SER: => GPS: b56206160800030703000000000031e5
gpsd:PROG: => GPS: UBX class: 06, id: 00, len: 20, crc: be72
gpsd:IO: SER: => GPS: b5620600140001000000d008000000c201000700010000000000be72
gpsd:PROG: => GPS: UBX class: 0a, id: 04, len: 0, crc: 0e34
gpsd:IO: SER: => GPS: b5620a0400000e34
gpsd:PROG: => GPS: UBX class: 06, id: 01, len: 3, crc: 104b
gpsd:IO: SER: => GPS: b56206010300010401104b
gpsd:PROG: => GPS: UBX class: 06, id: 01, len: 3, crc: 124f
gpsd:IO: SER: => GPS: b56206010300010601124f
gpsd:PROG: => GPS: UBX class: 06, id: 01, len: 3, crc: 2c83
gpsd:IO: SER: => GPS: b562060103000120012c83
gpsd:PROG: => GPS: UBX class: 06, id: 01, len: 3, crc: 45ac
gpsd:IO: SER: => GPS: b5620601030001300a45ac
gpsd:PROG: => GPS: UBX class: 06, id: 01, len: 3, crc: 47b0
gpsd:IO: SER: => GPS: b5620601030001320a47b0
gpsd:PROG: => GPS: UBX class: 06, id: 01, len: 3, crc: 0d45
gpsd:IO: SER: => GPS: b562060103000101010d45
gpsd:PROG: => GPS: UBX class: 06, id: 01, len: 3, crc: 1d65
gpsd:IO: SER: => GPS: b562060103000111011d65
gpsd:IO: UBX: len 10
gpsd:IO: UBX: len 108
gpsd:IO: UBX checksum 0x6a1d over length 108, expecting 0x2900 (type 0x0a04)
gpsd:IO: UBX: len 10
gpsd:IO: UBX: len 10
gpsd:IO: UBX: len 10
gpsd:IO: UBX: len 10
gpsd:IO: UBX: len 10
gpsd:IO: UBX: len 10
gpsd:IO: UBX: len 10
gpsd:PROG: KPPS:/dev/ttyUSB0 assert  1558522445.093228499, sequence: 1, clear   
1558522445.993206844, sequence: 2 - using: clear
gpsd:PROG: KPPS:/dev/ttyUSB0 Clear cycle:  999909, duration:  899978 @  
1558522445.993206844
gpsd:PROG: PPS:/dev/ttyUSB0 Clear cycle:  999909, duration:  899978 @  
1558522445.993206844
gpsd:INFO: PPS:/dev/ttyUSB0 Clear hooks called clock:  1558522445.993206844 
real:  1558522446.000000000: no fix
gpsd:PROG: PPS:/dev/ttyUSB0 Clear no fix @  1558522445.993206844 offset  
0.006793156
gpsd:IO: UBX: len 60
gpsd:PROG: UBX_NAV_SOL
gpsd:IO: UBX: len 232
gpsd:PROG: UBX_NAV_SVINFO
gpsd:PROG: => GPS: UBX class: 0a, id: 04, len: 0, crc: 0e34
gpsd:IO: SER: => GPS: b5620a0400000e34
gpsd:INFO: PRN=  2 az= 62 el=29 (0.772243, 0.410609, 0.484810)
gpsd:INFO: PRN= 12 az= 76 el=36 (0.784986, 0.195719, 0.587785)
gpsd:INFO: PRN= 24 az=140 el= 9 (0.634874, -0.756613, 0.156434)
gpsd:INFO: PRN= 25 az= 46 el=74 (0.198277, 0.191474, 0.961262)
gpsd:INFO: PRN= 29 az=185 el=69 (-0.031234, -0.357004, 0.933580)
gpsd:INFO: PRN= 32 az=239 el=32 (-0.726919, -0.436777, 0.529919)
gpsd:PROG: KPPS:/dev/ttyUSB0 assert  1558522446.093129939, sequence: 2, clear   
1558522445.993206844, sequence: 2 - using: assert
gpsd:PROG: KPPS:/dev/ttyUSB0 Assert cycle:  999901, duration:   99923 @  
1558522446.093129939
gpsd:PROG: PPS:/dev/ttyUSB0 Assert cycle:  999901, duration:   99923 @  
1558522446.093129939
gpsd:PROG: PPS:/dev/ttyUSB0 Assert ignored 1Hz trailing edge
gpsd:INFO: Sats used (6):
gpsd:IO: UBX: len 28
gpsd:IO: UBX: len 26
gpsd:PROG: UBX_NAV_DOP
gpsd:IO: UBX: len 28
gpsd:IO: UBX: len 24
gpsd:PROG: UBX_NAV_TIMEGPS
gpsd:PROG: NTP: ntpshm_put(/dev/ttyUSB0,-20)  1558522446.000499248 @  
1558522446.102471899
gpsd:IO: UBX: len 20
gpsd:IO: UBX: len 108
gpsd:INFO: UBX_MON_VER: SW 1.00 (59842),HW 00070000,PROTVER 
14.00,GPS;SBAS;GLO;QZSS
gpsd:PROG: KPPS:/dev/ttyUSB0 assert  1558522446.093129939, sequence: 2, clear   
1558522446.993107974, sequence: 3 - using: clear
gpsd:PROG: KPPS:/dev/ttyUSB0 Clear cycle:  999901, duration:  899978 @  
1558522446.993107974
gpsd:PROG: PPS:/dev/ttyUSB0 Clear cycle:  999901, duration:  899978 @  
1558522446.993107974
gpsd:PROG: NTP: ntpshm_put(/dev/ttyUSB0,-20)  1558522447.000000000 @  
1558522446.993107974
gpsd:INFO: PPS:/dev/ttyUSB0 Clear hooks called clock:  1558522446.993107974 
real:  1558522447.000000000: accepted
gpsd:PROG: PPS:/dev/ttyUSB0 Clear accepted @  1558522446.993107974 offset  
0.006892026
gpsd:IO: UBX: len 60
gpsd:PROG: UBX_NAV_SOL
gpsd:PROG: NTP: ntpshm_put(/dev/ttyUSB0,-20)  1558522447.000000000 @  
1558522447.060429360
gpsd:IO: UBX: len 28
gpsd:IO: UBX: len 26
gpsd:PROG: UBX_NAV_DOP
gpsd:IO: UBX: len 28
gpsd:IO: UBX: len 24
gpsd:PROG: UBX_NAV_TIMEGPS
8><-----------------------

Failing case: checksum error and the GPS stops sending packets, but no trk tick 
error contrary to the failing 9600 Bd case:
8><-----------------------
gpsd:INFO: launching (Version 3.18.1)
gpsd:IO: opening IPv4 socket
gpsd:IO: opening IPv6 socket
gpsd:INFO: listening on port 2947
gpsd:PROG: NTP: shmat(0,0,0) succeeded, segment 0
gpsd:PROG: NTP: shmat(32769,0,0) succeeded, segment 1
gpsd:PROG: shmget(0x47505344, 14024, 0666) for SHM export succeeded
gpsd:PROG: shmat() for SHM export succeeded, segment 3276802
gpsd:INFO: stashing device /dev/ttyUSB0 at slot 0
gpsd:PROG: no /etc/gpsd/device-hook present, skipped running ACTIVATE hook
gpsd:INFO: SER: opening GPS data source type 3 at '/dev/ttyUSB0'
gpsd:INFO: SER: speed 115200, 8N1
gpsd:PROG: no probe matched...
gpsd:INFO: gpsd_activate(2): activated GPS (fd 5)
gpsd:PROG: PPS:/dev/ttyUSB0 chrony socket /var/run/chrony.ttyUSB0.sock doesn't 
exist
gpsd:PROG: KPPS:/dev/ttyUSB0 checking /sys/devices/virtual/pps/pps0/path, 
/dev/ttyUSB0
gpsd:INFO: KPPS:/dev/ttyUSB0 RFC2783 path:/dev/pps0, fd is 6
gpsd:INFO: KPPS:/dev/ttyUSB0 pps_caps 0x1133
gpsd:INFO: KPPS:/dev/ttyUSB0 have PPS_CANWAIT
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS will be used
gpsd:PROG: PPS:/dev/ttyUSB0 thread launched
gpsd:INFO: PPS:/dev/ttyUSB0 ntpshm_link_activate: 1
gpsd:INFO: device /dev/ttyUSB0 activated
gpsd:INFO: running with effective group ID 0
gpsd:INFO: running with effective user ID 0
gpsd:INFO: startup at 2019-05-22T13:10:36.000Z (1558530636)
gpsd:PROG: switching to match packet type 1: 
$GPGSV,3,3,10,29,42,059,,31,49,207,*73\x0d\x0a
gpsd:PROG: switch_driver(NMEA0183) called...
gpsd:PROG: selecting NMEA0183 driver...
gpsd:INFO: /dev/ttyUSB0 identified as type NMEA0183, 0 sec @ 115200bps
gpsd:PROG: => Probing for Garmin NMEA
gpsd:IO: SER: => GPS: $PGRMCE*0E\x0d\x0a
gpsd:IO: <= GPS: $GPGSV,3,3,10,29,42,059,,31,49,207,*73
gpsd:WARN: GPGSV field 3 value of 10 != actual count 2
gpsd:INFO: Sats used (0):
gpsd:IO: <= GPS: $GPGLL,,,,,131036.00,V,N*4C
gpsd:WARN: can't use GLL time until after ZDA or RMC has supplied a year.
gpsd:PROG: GPGLL sentence timestamped 131036.00.
gpsd:PROG: GPGLL starts a reporting cycle.
gpsd:PROG: => Probing for FV-18
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Interrupted system call
gpsd:IO: SER: => GPS: $PFEC,GPint*58\x0d\x0a
gpsd:IO: <= GPS: $GPTXT,01,01,01,PGRM inv format*34
gpsd:WARN: TXT: Warning: PGRM inv format
gpsd:PROG: => Probing for Trimble Copernicus
gpsd:IO: SER: => GPS: $PTNLSNM,0139,01*5C\x0d\x0a
gpsd:IO: <= GPS: $GPTXT,01,01,01,PFEC inv format*2C
gpsd:WARN: TXT: Warning: PFEC inv format
gpsd:IO: <= GPS: $GPTXT,01,01,01,PTNL inv format*3A
gpsd:WARN: TXT: Warning: PTNL inv format
gpsd:IO: <= GPS: $GPRMC,131037.00,V,,,,,,,220519,,,N*77
gpsd:IO: <= GPS: $GPVTG,,,,,,,,,N*30
gpsd:WARN: unknown sentence: "$GPVTG,,,,,,,,,N*30\x0d\x0a"
gpsd:PROG: => Probing for UBX
gpsd:PROG: => GPS: UBX class: 06, id: 00, len: 0, crc: 0618
gpsd:IO: SER: => GPS: b562060000000618
gpsd:IO: <= GPS: $GPGGA,131037.00,,,,,0,00,99.99,,,,,,*61
gpsd:IO: <= GPS: $GPGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99*30
gpsd:PROG: xxGSA sets mode 1
gpsd:IO: <= GPS: $GPGSV,3,1,10,05,11,046,,09,02,339,,16,31,298,,21,56,157,*7A
gpsd:PROG: Partial satellite data (1 of 3).
gpsd:IO: <= GPS: $GPGSV,3,2,10,23,08,307,,25,22,115,,26,61,302,,27,08,250,*7E
gpsd:PROG: Partial satellite data (2 of 3).
gpsd:IO: <= GPS: $GPGSV,3,3,10,29,42,059,,31,49,207,*73
gpsd:INFO: Sats used (0):
gpsd:IO: <= GPS: $GPGLL,,,,,131037.00,V,N*4D
gpsd:WARN: can't use GLL time until after ZDA or RMC has supplied a year.
gpsd:PROG: GPGLL sentence timestamped 131037.00.
gpsd:PROG: GPGLL starts a reporting cycle.
gpsd:PROG: tagged GLL as a cycle ender.
gpsd:PROG: GPGLL ends a reporting cycle.
gpsd:IO: UBX: len 28
gpsd:PROG: switching to match packet type 11: 
b5620600140001000000c008000000c201000300030000000000ac5e
gpsd:PROG: switch_driver(u-blox) called...
gpsd:PROG: selecting u-blox driver...
gpsd:INFO: /dev/ttyUSB0 identified as type u-blox, 1 sec @ 115200bps
gpsd:PROG: => GPS: UBX class: 0a, id: 04, len: 0, crc: 0e34
gpsd:IO: SER: => GPS: b5620a0400000e34
gpsd:PROG: => GPS: UBX class: 06, id: 16, len: 8, crc: 31e5
gpsd:IO: SER: => GPS: b56206160800030703000000000031e5
gpsd:PROG: => GPS: UBX class: 06, id: 00, len: 20, crc: be72
gpsd:IO: SER: => GPS: b5620600140001000000d008000000c201000700010000000000be72
gpsd:PROG: => GPS: UBX class: 0a, id: 04, len: 0, crc: 0e34
gpsd:IO: SER: => GPS: b5620a0400000e34
gpsd:PROG: => GPS: UBX class: 06, id: 01, len: 3, crc: 104b
gpsd:IO: SER: => GPS: b56206010300010401104b
gpsd:PROG: => GPS: UBX class: 06, id: 01, len: 3, crc: 124f
gpsd:IO: SER: => GPS: b56206010300010601124f
gpsd:PROG: => GPS: UBX class: 06, id: 01, len: 3, crc: 2c83
gpsd:IO: SER: => GPS: b562060103000120012c83
gpsd:PROG: => GPS: UBX class: 06, id: 01, len: 3, crc: 45ac
gpsd:IO: SER: => GPS: b5620601030001300a45ac
gpsd:PROG: => GPS: UBX class: 06, id: 01, len: 3, crc: 47b0
gpsd:IO: SER: => GPS: b5620601030001320a47b0
gpsd:PROG: => GPS: UBX class: 06, id: 01, len: 3, crc: 0d45
gpsd:IO: SER: => GPS: b562060103000101010d45
gpsd:PROG: => GPS: UBX class: 06, id: 01, len: 3, crc: 1d65
gpsd:IO: SER: => GPS: b562060103000111011d65
gpsd:IO: UBX: len 10
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Connection timed out
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Connection timed out
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Connection timed out
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Connection timed out
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Connection timed out
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Connection timed out
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Connection timed out
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Connection timed out
gpsd:WARN: PPS:/dev/ttyUSB0 unchanged state, ppsmonitor sleeps 10
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Connection timed out
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Connection timed out
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Connection timed out
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Connection timed out
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Connection timed out
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Connection timed out
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Connection timed out
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Connection timed out
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Connection timed out
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Connection timed out
gpsd:WARN: PPS:/dev/ttyUSB0 unchanged state, ppsmonitor sleeps 10
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Connection timed out
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Connection timed out
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Connection timed out
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Connection timed out
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Connection timed out
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Connection timed out
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Connection timed out
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Connection timed out
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Connection timed out
gpsd:INFO: KPPS:/dev/ttyUSB0 kernel PPS timeout Connection timed out
gpsd:WARN: PPS:/dev/ttyUSB0 unchanged state, ppsmonitor sleeps 10
gpsd:PROG: KPPS:/dev/ttyUSB0 assert  1558530750.039223279, sequence: 6, clear   
1558530750.940082310, sequence: 7 - using: clear
gpsd:PROG: KPPS:/dev/ttyUSB0 Clear cycle: 1558530750940082, duration:  900859 @ 
 1558530750.940082310
gpsd:PROG: PPS:/dev/ttyUSB0 Clear cycle: 1558530750940082, duration:  900859 @  
1558530750.940082310
gpsd:PROG: PPS:/dev/ttyUSB0 Clear ignored missing last_fixtime
gpsd:PROG: KPPS:/dev/ttyUSB0 assert  1558530751.040065068, sequence: 7, clear   
1558530750.940082310, sequence: 7 - using: assert
gpsd:PROG: KPPS:/dev/ttyUSB0 Assert cycle: 1000841, duration:   99982 @  
1558530751.040065068
gpsd:PROG: PPS:/dev/ttyUSB0 Assert cycle: 1000841, duration:   99982 @  
1558530751.040065068
gpsd:PROG: PPS:/dev/ttyUSB0 Assert ignored missing last_fixtime
gpsd:PROG: KPPS:/dev/ttyUSB0 assert  1558530751.040065068, sequence: 7, clear   
1558530751.939932786, sequence: 8 - using: clear
gpsd:PROG: KPPS:/dev/ttyUSB0 Clear cycle:  999850, duration:  899867 @  
1558530751.939932786
gpsd:PROG: PPS:/dev/ttyUSB0 Clear cycle:  999850, duration:  899867 @  
1558530751.939932786
gpsd:PROG: PPS:/dev/ttyUSB0 Clear ignored missing last_fixtime
8><-----------------------

Best regards,
Benoît