GNSS coordinates wrong

[matega]

I'm using the TinyGSM_Net_GNSS example. The reported coordinates are wrong when the decimal part of the latitude has leading zeroes, because they are omitted. Example (edited for privacy reasons):

For the location 8FVQ63CF+97:

Returned: +CGNSSINFO: 3,06,01,47.2209676,N,15.7324227,E,240623,164300.31,190.0,0.688,,5.1,4.1,3.1,05

Valid one would be:

+CGNSSINFO: 3,06,01,47.2209676,N,15.0732422,E,240623,164300.31,190.0,0.688,,5.1,4.1,3.1,05

Even the count of the decimal places are the same, so the user program cannot even fix the error in software. Is there a fix for this? In the current state the GPS module is useless.

[GabrielZre]

I have the same problem for LILYGO® T-SIM A7608E-H the leading 0 is omitted. Treat it as a BUMP.

Please update the thread if this huge issue is somehow resolved.

[matega]

I'm using the same module, I just forgot to mention it: A7608E-H.

My workaround will probably be ordering a separate GPS module for 10 bucks, opening a dispute and leaving a bad review.

[gasagna]

Hi,

I think this issue is due to a bug in the SIMCOM firmware and there is not much that LilyGo can actually do, except perhaps report the bug upstream and provide the latest version of the firmware.

I might have two workarounds for this issues, as I am developing a library for the A76XX family (here, work in progress.. gps functionality not ready yet).

1. can you issue the AT command "AT+CGPSINFO" instead of "AT+GNSSINFO". Would be interesting to see if this command has the same issue.
2. You can try parsing the NMEA strings that are outputted upon issuing the command "AT+CGNSSTST=1".

You can read more about the GNSS functionality in the AT command manual (latest version is 1.09) and the GNSS application note available upon registration on the SIMCOM website.

[matega]

Hi @gasagna !

Thanks for your suggestions! Both of them seem to work. It looks like they didn't try to reformat the GPS coordinates in AT+CGPSINFO, so they had no opportunity to screw them up. Also the raw NMEA data seems to work (you need to do AT+CGNSSPORTSWITCH=1,1 too)

I agree, the bug is 100% in the SIMCOM firmware. They're still selling a broken product with broken example code and they weren't the ones provding support here in their own repository, it was the community (i.e. you).

[gasagna]

Hi @matega,

glad this helped.

And, yes, I agree with you. Support from lilygo is generally quite poor, especially in this repo. But their products are quite price competitive, so i got stuck with them even if I have been tempted to throw everything out of the window and buy more expensive hardware multiple times, as you can see from the other issues in this repository.

[lewisxhe]

Hi everyone .

I uploaded an example of directly outputting NMEA messages through a modem to obtain location and other information

[lewisxhe]

Please send AT+SIMCOMATI to get the current version information, and scan the QR code on the modem to report the version you are currently using and provide it to me. I will ask SIMCOM for the latest firmware to see if the problem of coordinate errors can be solved by upgrading. . Please block IMEI, IMEI do not send to me

[GabrielZre]

Manufacturer: INCORPORATED Model: A7608E-H Revision: A7600M7_V5.0 +GCAP: +CGSM,+FCLASS,+DS

P/N:S2-10A64-Z3118;SN:MP0622367A24C3F;SW:A50C4B07A7600M7

[lewisxhe]

Give me some time, I want SIMCOM to seek a new version of firmware

[lewisxhe]

Hi, everyone Currently the latest firmware is B08, please try to upgrade the latest firmware for testing

A7608 UpgradeFirmware video Update tools A7608E-H FW A7608SA-H FW

[GabrielZre]

After flashing latest firmware - A7608E-H_Nor_Facotry_only_Erase_All The problem still occurs. The leading 0 is omitted in gps location (CGNSSINFO)

[GabrielZre]

Example GPS_NMEA_Parse cant find location in my case. When im outside, CGNSSINFO and CGPSINFO is finding location really fast.

@matega could you please share your code? Does this GPS_NMEA_Parse works fine in your case on the same board?

[lewisxhe]

I tested it before I uploaded the example, but I didn't test it after I took the upgrade video, and found that the baud rate is not 115200, but 9600, changing the baud rate will correctly parse NMEA
Video: https://youtu.be/TQFHZl6eGOU

[lewisxhe]

I have reported to SIMCOM that the coordinates obtained by CGNSSINFO are wrong, and there is nothing I can do at the moment, I can only wait for them to provide updated firmware. If there is a new firmware, I will release it in time.

[gasagna]

Hi, everyone Currently the latest firmware is B08, please try to upgrade the latest firmware for testing

A7608 UpgradeFirmware video Update tools A7608E-H FW A7608SA-H FW

Hi @lewisxhe, can you also share the release notes for this firmware version, or a changelog? thanks

[lewisxhe]

Those who have not yet updated can pause the update. I have already reported that SIMCOM has the same issue with version b08, and they are currently fixing it. When will it be completed and I will release it

[lewisxhe]

Hi, everyone Currently the latest firmware is B11, please try to upgrade the latest firmware for testing

A7608 UpgradeFirmware video Update tools A7608E-H FW A7608SA-H FW

[ivanvaccari]

I want to add some infos to be here for the eternity:

• Windows may require drivers when connecting via micro-usb. They are placed into A76XX_A79XX_MADL V1.13 Only for Update/A1802&1803&1826Driver folder

Github hosted files (to prevent losing access to the shared onedrive files)

• A7608E-H FW A50C4B11A7600M7_A7608E-H_V102220606.zip
• Update tools A76XX_A79XX_MADL V1.13 Only for Update.zip
• A7608SA-H FW A50C4B11A7600M7_A7608SA-H_V102220719.zip