GPS related issue

mangOH Green
1

Hi Team,

We have created an application which will fetch GPS co-ordinates and continuously publish the location of the device using MQTT publish.
The issue is we are not able to get location details, see below snippet

le_pos_GetFixState();
le_pos_sample_Get2DLocation()

Here, the FixState() api is returning -3 as error. Which means the position is not fixed.

Then we tried using gnss commands and tried to get position.
gnss get posInfo is returning Position not fixed
Then tried: gnss fix is returning TTFF not calculated.

Tried also with at commands: AT!GPSTRACK, AT!GPSSTATUS, AT!GPSSATINFO…
at!gpssatinfo?
Satellites in view: 2 (1980 01 06 6 00:00:00)

  • SV:255 ELEV: 0 AZI: 0 SNR: 27
  • SV:255 ELEV: 0 AZI: 0 SNR: 28

We got to know minimum of 3 to 4 SATS are required for getting fixed location.

I am not able to resolve this issue.

Please help me with this?

Thanks,
Pallavi B.

2

In MS-based mode in AT!GPSFIX, 4 or more SVs are required to generate a fix.

3

Can I know what are all the different ways to get device position info other than GNSS???

Regards,
Pallavi.

4

I remember I can get positioning data via SUPL in indoor environment

5

can you suggest some docs that support SUPL for MangoH Green. How can i use SUPL on MangoH Green?

Thanks,
Pallavi.

6

do you have a SUPL server?

you need to use AT!GPSSUPLURL to set up
after that you need to use “MS-assisted only” mode in AT!GPSFIX

7

Hi jyijyi,

we have supl.google.com server or supl.nokia.com server. Can we use those?

8

I used google SUPL server before, but later, it cannot be used publicly.

You need to do some testing.

Good luck!

9

Before using this command “AT!GPSSUPLURL”, do we need to set any other commands.

Thanks and Regards,
Pallavi

10

Check “GPSENABLE” in AT!CUSTOM?
Also check “AT!GPSSUPLVER” and AT!GPSTRANSSEC

11

Hello,

I have used the below AT Commands and got the below responses.

AT!CUSTOM?
!CUSTOM:
ISVOICEN 0x01
GPIOSARENABLE 0x01
GPSENABLE 0x01
WAKEHOSTEN 0x83
NMEAENABLE 0x01
GOBIIMEN 0x01
USBECMRNDISOPTION 0x01
HSICENABLE 0x01
SINGLEAPNSWITCH 0x01
SIMLPM 0x01
BOOTQUIETDISABLE 0x01
FASTBOOTEN 0x01

OK

AT!GPSSUPLURL="supl.google.com:7275"
OK
at!gpssuplver?
!GPSSUPLVER: 2

OK
at!gpsfix=3,200,10
ERROR

While trying to fix the GPS as MS-assisted mode, we are getting error.

Can you please help out with the reason for the error??

12

I don’t see problem with my module:

at!entercnd="A710"
OK
AT!GPSSUPLURL="supl.google.com:7275"
OK
at!gpssuplver?
!GPSSUPLVER: 2

OK
at!gpsfix=3,200,10
OK
at!gpsend=0
OK
at!gstatus?
!GSTATUS:
Current Time:  126              Temperature: 45
Modem Mitigate Level: 0         ModemProc Mitigate Level: 0
Reset Counter: 1                Mode:        ONLINE
System mode:   LTE              PS state:    Attached
IMS reg state: NOT REGISTERED   IMS mode:    Normal
IMS Srv State: NO SMS,NO VoIP
LTE band:      B7               LTE bw:      20 MHz
LTE Rx chan:   2850             LTE Tx chan: 20850
LTE CA state:  INACTIVE
EMM state:     Registered       Normal Service
RRC state:     RRC Connected

PCC RxM RSSI:  -75              RSRP (dBm):  -103
PCC RxD RSSI:  -89              RSRP (dBm):  -133
Tx Power:      0                TAC:         0003 (3)
RSRQ (dB):     -10              Cell ID:     04BB6102 (79388930)
SINR (dB):      2.6

OK
at+cgpaddr=1
+CGPADDR: 1,10.105.153.16

OK
ati3
Manufacturer: Sierra Wireless, Incorporated
Model: WP7609
Revision: SWI9X07Y_02.28.03.05 000000 jenkins 2019/07/08 11:04:16
IMEI: 359782080100399
IMEI SV:  6
FSN: WA803370010610
+GCAP: +CGSM

OK
at!gpsend=0
OK
at!gpsfix=3,200,10
OK
13

Then what am I missing, any pre-requirements to be enabled? What might be the issue. Please help me?

Thanks
Pall

14

are we using same FW R13.3?
Does it work after typing at!gpsend=0 ?
did your module register network and obtain IP address?

15

Hi jyijyi,

Please refer below AT commands for my device responses.

at!entercnd="A710"
OK
at!gpssuplurl="supl.google.com:7275"
OK
at!fps
ERROR

ERROR
at!gpsfix=3,200,10
ERROR
at+cgpaddr=1
+CGPADDR: 1,25.34.26.46

OK
ati3
Manufacturer: Sierra Wireless, Incorporated
Model: WP7504
Revision: SWI9X15Y_07.12.09.00 r34123 CARMD-EV-FRMWR1 2017/04/26 23:34:19
MEID: 35620707004710
ESN: 12805302987, 8050EACB
IMEI: 356207070047106
IMEI SV: 45
FSN: P1646200180503
+GCAP: +CGSM


OK
at!gpssend=
ERROR
at!gpsend=0
OK
at!gpsfix=3,200,10
ERROR
16

I am currently using WP76 module

17

Any Idea about the issue with WP7504 module??

18

Does at!gpsfix work on
• 1=Standalone (not supported by a mobile station)
• 2=MS-based only

???

19

No, even for Standalone and MS-based also I am getting Error.

20

You better take another module for testing