Help to identify protocol

Good day. I got a china brand GF-21 and tried all the ports on the china clones with no success. The SMS command is similar to TOPIN, however port 5199 also doesn't work. Below is a sample hex from the log.

2021-11-10 18:50:56  INFO: [ba5d14db: topin < 122.171.88.100] HEX: 5452564150303038363932303730333033303436363223

Any help is much appreciated. Thank you.

It's TRV protocol.

Thanks for your help Anton. May I know is LBS works for TRV protocol? I enabled it in config with google API, restarted server, but the position is not showing.

Looks like it's supported.

Ok Anton. I found the LBS section in TrvProtocolDecoder.java. However, the GF-21 protocol seems a bit different. Will customize the code to suite it. Thanks.

Sure. Feel free to send a pull request to include those changes.

Hi @Ping, Did you have any advances in gf-21 protocol. The Location with WIFI and LBS is also different with TRVDecoder.
This is a full wifi and lbs log:

5452565950313532323032303856303030302e303030304e30303030302e30303030453030302e303138333531303030302e3030313030303030303435303030303230303030342c3433322c33352c31323434362c32353132312c30302c656e2d75732c30312c4850204c617365724a7c36432d31392d38462d42432d42372d43347c2d3832264d65686469706f75727c43382d42452d31392d32302d38462d35427c2d38302649542d4d4e4765724a7c34382d45452d30432d34342d30302d36437c2d36302648502d5072696e742d7c34302d34392d30462d36382d34312d32437c2d373923

TRVYP15220208V0000.0000N00000.0000E000.0183510000.001000000450000200004,432,35,12446,25121,00,en-us,01,HP LaserJ|6C-19-8F-BC-B7-C4|-82&Mehdipour|C8-BE-19-20-8F-5B|-80&IT-MNGerJ|48-EE-0C-44-00-6C|-60&HP-Print-|40-49-0F-68-41-2C|-79

But the TRV does not support YP15 and only have YP03.

Regards