JT600 error

hi,
can you help me understand the error below?
this one appeared with the addition of the JT701D from jointech

2022-02-28 17:09:35  INFO: [7b6024ba] connected
2022-02-28 17:09:35  INFO: [7b6024ba: jt600 < 129.0.60.2] HEX: 000f333532303933303830353134353938
2022-02-28 17:09:35  WARN: [7b6024ba] error - ParseException (Jt600FrameDecoder:49 < BaseFrameDecoder:29 < ... < WrapperInboundHandler:57 < ...)
2022-02-28 17:09:35  INFO: [7b6024ba] disconnected
2022-02-28 17:09:35  WARN: [7b6024ba] error - ParseException (Jt600FrameDecoder:49 < BaseFrameDecoder:29 < ... < WrapperInboundHandler:50 < ...)

thanks

Do you have protocol documentation?

yes

ok