GT02A protocol identification

Hello guys,

Excellent work!
I am trying to identify the protocol of a chinese clone of GT02A https://www.ebay.com/itm/GT02A-Car-GPS-Tracker-GSM-GPRS-SMS-Vehicle-Tracking-Device-Monitor-Locator/163818956052

Board is GT02_MT6261D_V2.3 and imei is like 35267XXXXXXXXXX

Visually it is like TK110 and it is configured by sms like this:

APN123456 ipn_address (for internet access)
adminip123456 server_address server_port (for setting tracking server address)
fix015s***n123456 (for tracking every 15″)

Here is a dump of tracking every 5" separated by 0xD 0xA (not dumped)

[03:00:52] Server started...
[03:01:27] Client 127.0.0.1 connected
[03:01:28] 78 78
[03:01:28] 01 03 52 67 21 00 62 78 19 01 02 D1 5A
[03:01:32] 78 78 13 44 06 04 00 01 00 FB 65
[03:01:34] 78 78 22 22 13 0C 10 01 00 2B C6 04 14 56 A3 02 8D 91 F0 00 14 00 00 CA 05 00 1B 00 01 E3 00 00 00 00 FC 29 7C
...
[03:20:02] 78 78 22 22 13 0C 10 01 14 03 C6 04 14 56 19 02 8D 91 66 00 14 00 00 CA 05 00 1B 00 01 E3 00 00 00 01 9F 3B 6E
[03:20:12] 78 78 13 44 06 04 00 01 01 A0 FF EB
[03:20:15] 78 78 22 22 13 0C 10 01 14
[03:20:15] C7 04 14 56 76 02 8D 91 41 00 14 00 00 CA 05 00 1B 00 01 E3 00 00 00 01 A1 3A 6D
[03:20:22] 78 78 22 22 13 0C 10 01 14 17 C7 04 14 56 8B 02 8D 91 45 00 14 00 00 CA 05 00 1B 00 01 E3 00 00 00 01 A2 03 9F
[03:20:32] 78 78 22 22 13 0C 10 01 14 21 C7 04 14 56 73 02 8D 91 57 00 14 00 00 CA 05 00 1B 00 01 E3 00 00 00 01 A3 8F 7C
[03:20:41] Exception :Unable to read beyond the end of the stream.
[03:20:41] Client disconnected

It's GT06 protocol, port 5023.

Thanks Anton, i will give it a try later :)

It works, thank you Anton!
I am trying for a .net c# implementation, so the main source code to examine is this https://github.com/traccar/traccar/blob/master/src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java ?
This device is branded also as Concox GT06N am i right?

Hi!
I have the same GPS tracker, GT02_MT6261D_V2.3.
When I enter the port 5023, nothing...
Could someone help me please ?