,---------Y                                         ...........
  |TCPServer|                                         |TCPClient|
  |---------|                                         |---------|
  '`'''''''''                                         '`'''''''''
      | [seq=129028660,SYN]            _____________.......|
      |<.....,------------'''''''''''''                    |
      |                                                    |
      |-----.........________[seq=27919705,SYN|ACK]        |
      | [ACK=129028661]      `'''''''`--------.........___>|
      |                                                    |
      |[seq=129028661,ACK=27919706]        _________,,.....|
      |<___,,.........,----------''''''''''                |
      |                                                    |
      |......__________"GrnvsTcpServer"[seq27919706,PSH|ACK]
      |[ACK=129029661] `'''''''''----------...........____>|
      |                                                    |
      |[seq=129028661,ACK=27919766]  _________........,----|
      |<__,,........---------''''''''                      |
      |                                                    |
      |-----.........________"HELLO"[seq=129028661,PSH|ACK]|
      |[ACK=27919766]        `'''''''---------.........___>|
      |                                                    |
      |                                                    |