anchor.diff:  
        traffic_ping_pong_small_sendmsg_and_recvmsg_udp4,
        traffic_ping_pong_small_sendmsg_and_recvmsg_udp6,
  +     traffic_ping_pong_small_sendmsg_and_recvmsg_udpL,
        traffic_ping_pong_medium_sendmsg_and_recvmsg_udp4,
        traffic_ping_pong_medium_sendmsg_and_recvmsg_udp6
       ].
  
positive.code:            fun() -> has_support_ipv6() end,
             fun() ->
                     ?TT(?SECS(30)),
                     InitState = #{domain => inet,
                                   proto  => udp,
                                   msg    => Msg,
                                   num    => Num},
                     ok = traffic_ping_pong_sendmsg_and_recvmsg_udp(InitState)
  
negative.code: 
           traffic_ping_pong_small_sendmsg_and_recvmsg_udp4/1,
           traffic_ping_pong_small_sendmsg_and_recvmsg_udp6/1,
           traffic_ping_pong_small_sendmsg_and_recvmsg_udpL/1,
           traffic_ping_pong_medium_sendmsg_and_recvmsg_udp4/1,
           traffic_ping_pong_medium_sendmsg_and_recvmsg_udp6/1,
  
  