Hello,
I am trying to use the GPS of a MC7455, with no success…
I work on ubuntu linux with:
Manufacturer: Sierra Wireless, Incorporated
Model: MC7455
Revision: SWI9X30C_02.24.05.06 r7040 CARMD-EV-FRMWR2 2017/05/19 06:23:09
MEID: 35907206321118
IMEI: 359072063211185
IMEI SV: 12
FSN: LQ842642370110
+GCAP: +CGSM
The GSM works correctly.
I can get NMEA messages on the ttyUSB1 but they never contains any time or position data, no fix is ever made.
Sometimes the NMEA shows that up to 13 satellites are found. I then waited for hours but it never gets data.
I test with two different types of antennas on different PC, and I tried two different MC7455 with no success.
So far I did:
-
disabling NetworkManger and ModemManager --> no changes
-
at!gpsstatus? -> it always respond the following answers (the second one after a while):
Current time: 1980 01 06 6 00:03:41
1980 01 06 6 00:03:41 Last Fix Status = NONE
1980 01 06 6 00:00:03 Fix Session Status = ACTIVENo TTFF available
Current time: 1980 01 06 6 00:13:10
1980 01 06 6 00:00:00 Last Fix Status = FAIL, FAILCODE = 0
1980 01 06 6 00:12:48 Fix Session Status = ACTIVENo TTFF available
-
at!gpstrack? -> it always respond ERROR as if the command is not recognized
-
I played with the setting of at!custom: changed the combinations of values with no effects:
at!custom=“GPSSEL”,0 or 1
at!custom=“GPSLPM”,0 or 1 -
at!GPSAUTOSTART=1,1,255,100,1 --> no effects
at!GPSAUTOSTART?
function: 1
fixtype: 1
maxtime: 255 seconds
maxdist: 100 meters
fixrate: 1 seconds
OK -
at!gpsloc? -->
Not Available -
at!GPSSATINFO? -->
NO SAT INFO
At the moment I am completely stuck any ideas what I could try?
Thanks,
raphael