Queclink GV500GC device Protocol

Moto1987 5 months ago

Hi, I have purchased a queclink device and set it up with the software. The device also sends data to my server, but it can't do anything with it. From the log I can read the following HEX value:

102400044d51545404c00e1000065352363030360006535236303036000870617373776f7264

The HEX decoder from this page here cannot convert the code. I then had the code converted in an online decoder and the following text came out:

$�MQTTÀ�SR6006�SR6006�password

SR6006 is the name of the device, but I never set a password. Apparently I have to.

Is there a way I can get the device to run successfully on my server?

The port number is 5004, almost forgotten to mention.

Moto1987 5 months ago
INFO: [Tf43138d1: gl200 < 176.83.136.203] 102400044d51545404c00e1000065352363030360006535236303036000870617373776f7264
2025-07-29 08:25:22  WARN: [Tf43138d1] error - index: 0, length: 4 (expected: range(0, 1)) - IndexOutOfBoundsException (... < Gl200FrameDecoder:37 < Gl200ProtocolDecoder:51 < ExtendedObjectDecoder:73 < ... < WrapperContext:102 < ...)
2025-07-29 08:25:22  WARN: [Tf43138d1] error - index: 0, length: 4 (expected: range(0, 0)) - IndexOutOfBoundsException (... < Gl200FrameDecoder:37 < Gl200ProtocolDecoder:51 < ExtendedObjectDecoder:73 < ... < WrapperContext:102 < ...)
2025-07-29 08:25:22  INFO: [Tf43138d1] disconnected

This is the full info from the log file

Anton Tananaev 5 months ago

Port 5004 is definitely not the right one for this format. It looks like some new MQTT-based protocol.

Moto1987 5 months ago

I will try later other settings.

I have seen that I can also select a TCP short connection option with the traccar.
I will report how it goes

Moto1987 5 months ago

Unfortunately, nothing has brought success. I have the following setting options. What do you mean? Will I be able to connect the device or should I buy another one?

https://we.tl/t-L7wGSGOp3w

Anton Tananaev 5 months ago

The problem is MQTT formst and I still see on your screenshots.

Moto1987 5 months ago

What do you mean by that, that's what you see in my screenshots? Is everything configured incorrectly? I set the port to 5055 as a test, but after that, I stopped receiving messages. According to the log entry, messages are coming back on port 5004.

Anton Tananaev 5 months ago

Have you checked your screenshots to see where it says MQTT? That is not a supported format, as I keep repeating.