What is not supported:
    - the authenticated, encrypted mode for client and server
    - it has the option to set this mode for client and server, but is not
      yet supported. The messages were defined but the logic is not
      implemented.

To run:
    make
    make setcap
    ./server [-h | -a <not supported> | -p <port>]
    ./client -s <ip_server [-h | -a <not_supported> | -p <port_sender> | -P
    <port_receiver> | -n <test_sessions> | -m <test_sess_msgs>]