HTTP/1.1 400 Bad Request content-length: 0

I have this message when i decode hex message :

HTTP/1.1 400 Bad Request
content-length: 0

You are trying to decode message from the server.

yes there is the message :

2019-04-24 08:13:50  INFO: [e8b31252] connected
2019-04-24 08:13:56  INFO: [e8b31252: 5055 < 105.235.139.1] HEX: 234c23322e303b3836363739353033323036343937323b313939313b384435390d0a
2019-04-24 08:13:56  INFO: [e8b31252: 5055 > 105.235.139.1] HEX: 485454502f312e31203430302042616420526571756573740d0a636f6e74656e742d6c656e6774683a20300d0a0d0a
2019-04-24 08:14:02  INFO: [17dba65e] connected

The first message is the authentication of the equipment [#L#2.0;866795032064972;1991;8D59] and the second is the following message [HTTP/1.1 400 Bad Request
content-length: 0]

You are using wrong port.