How to know what IMEI or device is?

Hello, i see this info in my log

2021-09-08 19:16:34  INFO: [a2f50e2c] connected
2021-09-08 19:16:36  INFO: [a2f50e2c: gps103 < 200.68.161.226] HEX: 78780d01035288707629032300c50acb0d0a
2021-09-08 19:16:36  WARN: [a2f50e2c] error - begin 21, end 24, length 15 - StringIndexOutOfBoundsException (... < Gps103ProtocolDecoder:413 >
2021-09-08 19:16:36  WARN: [a2f50e2c] error - begin 21, end 24, length 3 - StringIndexOutOfBoundsException (... < Gps103ProtocolDecoder:413 <>
2021-09-08 19:16:36  INFO: [a2f50e2c] disconnected

2021-09-08 19:16:38  INFO: [2754e5c2] connected
2021-09-08 19:16:39  INFO: [2754e5c2: gps103 < 200.68.161.226] HEX: 78780d01035288707629032300c729d90d0a
2021-09-08 19:16:39  WARN: [2754e5c2] error - begin 21, end 24, length 18 - StringIndexOutOfBoundsException (... < Gps103ProtocolDecoder:413 >
2021-09-08 19:16:39  INFO: [2754e5c2] disconnected

2021-09-08 19:16:43  INFO: [7c0c6916] connected
2021-09-08 19:16:44  INFO: [7c0c6916: gps103 < 200.68.161.226] HEX: 78780d01035288707629032300c9c0a70d0a
2021-09-08 19:16:44  WARN: [7c0c6916] error - begin 21, end 24, length 18 - StringIndexOutOfBoundsException (... < Gps103ProtocolDecoder:413 >
2021-09-08 19:16:44  INFO: [7c0c6916] disconnected

trying to undestand, using hex decode cant get any info. "Binary Hex can't be converted to Text"

since i lost the information about imei i am guessing in some gps i had installed and also removing instead 15 numbers to 12, some worked like that.

so, how to decode that HEX ?

This is the most relevant page for your case:

https://www.traccar.org/clones/

Your device is using GT06 protocol, it looks like. And it's a binary protocol, so you can't convert it to text.

thank you i will try again the different ports.

do you recommend to insert the full imei? or cropped to 12 digits?

thanks

Specifically for GT06 you should use full IMEI. But in general once you find the correct port, you will see the identification in the log.

thank you Anton!