anchor.diff:  traffic_send_and_recv_chunks_tcp4(doc) ->
       [];
   traffic_send_and_recv_chunks_tcp4(_Config) when is_list(_Config) ->
  +    ?TT(?SECS(30)),
       tc_try(traffic_send_and_recv_chunks_tcp4,
              fun() ->
  -                   ?TT(?SECS(30)),
  -                   InitState = #{domain => inet},
  +                   InitState = #{domain => inet,
  +                                 proto  => tcp},
                      ok = traffic_send_and_recv_chunks_tcp(InitState)
              end).
   
  
positive.code:                            {ok, State#{local_sa => LSA}}
                     end},
           #{desc => "create listen socket",
             cmd  => fun(#{domain := Domain} = State) ->
                             case socket:open(Domain, stream, tcp) of
                                 {ok, Sock} ->
                                     {ok, State#{lsock => Sock}};
                                 {error, _} = ERROR ->
  
negative.code:     i("traffic_snr_tcp_client_await_start -> entry"),
      ?SEV_AWAIT_START(Parent).
  
  traffic_snr_tcp_client_create(Domain, Proto) ->
      i("traffic_snr_tcp_client_create -> entry"),
      case socket:open(Domain, stream, Proto) of
          {ok, Sock} ->
              Sock;
          {error, Reason} ->
  