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[gpsd-users] Python GPSD interface and symmetricon 2750


From: Ryan Tennill
Subject: [gpsd-users] Python GPSD interface and symmetricon 2750
Date: Sat, 14 Apr 2018 14:20:02 +0000

For some reason the python interface doesn't seem to be picking up the number of satellites or the fix status. I am parsing the responses myself to work around this behavior but I would like to use more tried and tested machinery in gpsd if it's available. I assume I just don't have it configured correctly.

The GPS is configured to send GGA and RMC messages over the serial interface which seems to be working just fine. I get good data when watching gpspipe and gpsmon does show the proper fix status and satellite count.

Here's what the client looks like after receiving some GGA and RMC messages:

Time:     2018-04-13T14:21:15.000Z (2018-04-13T14:21:15.000Z)
Lat/Lon:  40.116415 -88.311605
Altitude: 227.000000
Speed:    0.000000
Track:    0.000000
Status:   STATUS_NO_FIX
Mode:     MODE_3D
Quality:  0 p=0.00 h=0.00 v=0.00 t=0.00 g=0.00
Y: 0 satellites in view:

Some example sentences are:
'$GPRMC,142115.00,A,4006.9849,N,08818.6963,W,0.0,0.0,130418,,*21\r\n'
'$GPGGA,142116.00,4006.9849,N,08818.6963,W,2,10,0.9,227.0,M,-33.2,M,,*51\r\n'

Datasheet: https://www.microsemi.com/existing-parts/parts/138158
Setup: GPS-2750 over UART (not USB-Serial) to a Nvidia Jetson TX2 running Ubuntu 16.04 (arm64)
GPSD version: 3.15 (revision 3.15-2build1)
Watch flags: WATCH_ENABLE|WATCH_JSON|WATCH_RAW

Ryan


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