Having issues with the GPS GV 57

I am using traccar 6.6 ubuntu version and have turnt of ignition and odometer in the GPS software.
I am experiencing issues with this GPS GV57MGV2, while attempting to connect it to the Traccar platform.

In the Traccar logs, the GPS device appears to be returning an empty string.

2025-01-17 12:53:11  INFO: [Tcfcfde09] connected
2025-01-17 12:53:12  INFO: [Tcfcfde09: gl200 < 88.**.**.140] +ACK:GTHBD,840502,867963063196555,GV57MGV2,20250117125312,5CA5$
2025-01-17 12:53:12  INFO: Event id: 86796306319****, time: 2025-01-17 12:53:12, type: deviceOnline, notifications: 0
2025-01-17 12:53:12  INFO: [Tcfcfde09: gl200 > 88.**.**.140] +SACK:GTHBD,840502,5CA5$
2025-01-17 12:53:12  INFO: [Tcfcfde09: gl200 < 88.**.**.140] +BUFF:GTIGF,840502,86796306319****,,0,0,,,,,,,0268,0006,22C4,13E5,00,,,20250116170541,22D0$
2025-01-17 12:53:12  WARN: [Tcfcfde09] error - empty String - NumberFormatException (... < Gl200TextProtocolDecoder:1049 < *:1660 < Gl200ProtocolDecoder:54 < ExtendedObjectDecoder:73 < ... < WrapperContext:102 < ...)
2025-01-17 12:53:12  INFO: [Tcfcfde09] disconnected

I have configured the GPS to communicate using the GL200 protocol on Traccar, but the connection does not seem to work as expected. I would appreciate your assistance in resolving this issue.

Looks like we don't expect some fields to be empty. Do you have the protocol documentation for your device?

I don't have the official documentation for the protocol, but I have seen claims on some websites that it uses the @Track Air Interface Protocol.

Reference: https://manuals.plus/queclink/gv57mg-cat-nb2-gnss-tracker-manual

We are currently waiting for a meeting with the company to clarify how to fix the issue, but the process is taking a long time.

Hello, I apologize for the long wait. I was in the process of obtaining permission to share the documentation so that you could assist me with this issue. Could you provide an email I could share with ? As the document is confidential and it was mentioned that I could only share with the specific people.

You can send to the support email address.

I've sent the documention, thank for your time

This should fix the problem:

https://github.com/traccar/traccar/commit/8e89c0413405270fbcbbcd9dd706e7c5f26e4a7c

Thank you I will do some test and give feedback after concluding

Hello it seems that the problem still persist

Did you compile from master branch?

Yes

OK, can you share the JAR file you created?

Here you go - https://we.tl/t-SgsXQkZN5Q

Hello. Were you able to get the file or do you need me to provide it again ?

I checked your JAR file and it doesn't include this change.