BG77 GNSS AT commands always return ERROR

IoT Modules LPWA Module
1

Hello,

I have UMTS&LTEEVB-KIT and BG77-TEA daughter board. Now, I have configured nbiot and send some data over MQTT to my test server. But I cannot test the GNSS functionality.

What i did so far:

  1. Installed drivers to my Windows PC. Right now, in the device manager window, I can see ;

    • Prolific PL2303GT USB Serial COM Port (COM22)
    • Quectel USB DM Port (COM38)
    • Quectel USB NMEA Port (COM36)
    • On “Modems” section of the device manager, Quectel USB Modem leshan-lwm2m-server

  2. Downloaded QGNSS V2.0. I tried to connect to the device and see the BG77’s NMEA outputs, I couldn’t succeed. For example, I don’t know what model to select on Device Information window.What will be the USB port? (Tried all of them with some models and no success). How can I use QGNSS V2.0 for BG77 and UMTS kit?

  3. Having failures from the QGNSS software, I switched to use direct AT commands to see a GPS fix and GGA data. But, most of the GNSS AT commands returns “ERROR”. What should I do?

Here is shutting down NBIOT and using GNSS commands outputs:

Sample log-1:

[2025-03-17_14:59:17:933] ` ¬ÄH$üÉæÿXeVUm?«a÷;k÷ßó
[2025-03-17_14:59:20:120]RDY
[2025-03-17_14:59:22:005]
[2025-03-17_14:59:22:005]APP RDY
[2025-03-17_14:59:25:233]AT+CSQ

[2025-03-17_14:59:25:233]+CSQ: 18,99

[2025-03-17_14:59:25:233]OK
[2025-03-17_14:59:26:872]AT+CEREG?

[2025-03-17_14:59:26:872]+CEREG: 0,1

[2025-03-17_14:59:26:872]OK
[2025-03-17_14:59:28:957]AT+CGPADDR=1

[2025-03-17_14:59:28:957]+CGPADDR: 1,10.172.1.31

[2025-03-17_14:59:28:957]OK
[2025-03-17_15:00:32:482]AT+CGATT=0

[2025-03-17_15:00:49:801]OK
[2025-03-17_15:00:52:366]AT+COPS=2

[2025-03-17_15:00:57:806]OK
[2025-03-17_15:00:59:103]AT+CFUN=4

[2025-03-17_15:00:59:125]OK
[2025-03-17_15:01:04:744]AT+QGPS=1

[2025-03-17_15:01:04:750]OK
[2025-03-17_15:01:10:947]AT+QGPSLOC?

[2025-03-17_15:01:10:947]ERROR
[2025-03-17_15:01:20:055]AT+QGPSLOC?

[2025-03-17_15:01:20:055]ERROR
[2025-03-17_15:03:08:261]AT+QGPSLOC?

[2025-03-17_15:03:08:261]ERROR
[2025-03-17_15:03:09:142]AT+QGPSLOC?

[2025-03-17_15:03:09:142]ERROR
[2025-03-17_15:03:58:740]AT+QGPSGNMEA=“GSV”

[2025-03-17_15:03:58:740]ERROR

“Sample log-2”:
[2025-03-17_15:18:49:051]AT+CSQ

[2025-03-17_15:18:49:051]+CSQ: 19,99

[2025-03-17_15:18:49:051]OK
[2025-03-17_15:23:55:240]AT+QGPSCFG=“priority”,0

[2025-03-17_15:23:55:240]ERROR
[2025-03-17_15:24:03:805]AT+CGATT=0

[2025-03-17_15:24:20:447]OK
[2025-03-17_15:25:14:724]AT+COPS=2

[2025-03-17_15:25:20:457]OK
[2025-03-17_15:25:21:908]AT+CFUN=4

[2025-03-17_15:25:21:935]OK
[2025-03-17_15:25:27:244]AT+CFUN=1

[2025-03-17_15:25:27:244]OK
[2025-03-17_15:25:37:513]AT+QGPSEND

[2025-03-17_15:25:37:513]+CME ERROR: 505
[2025-03-17_15:25:44:824]AT+QGPS=1

[2025-03-17_15:25:44:830]OK
[2025-03-17_15:25:59:545]AT+QGPSLOC?

[2025-03-17_15:25:59:545]ERROR

How can I use the GNSS? Is it about firmware?

Best regards,

Onur

2

I solved the issue. It is about old firmware.