Your device is using GPS103 protocol, so correct port is 5001. Please also check following page:
https://www.traccar.org/ports-for-tk-gt-and-other-gps-devices/
Thank you for reply
Using 5001 port
Some devices is fine
Some devices is not working same message send to server
Do you know "LOAD" mean
I don't know if it's TK103B or GPS103B, but it looks exactly same.
If I send command "Check123456" then it gives GPRS OFF, GPS ON, and GSM 23.
But Server only receives as Hexa value as follows:
23232c696d65693a3836383638333032353939313331302c413b
4c4f4144
I don't know why it gives this value even the GPS is on and it has no problem for server communication.
Please help me to solve this problem, or give me any comments. Thank you.