anchor.diff:  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   
   %% Basically send and receive on an IPv4 UDP (dgram) socket using
  -%% sendto and recvfrom..
  +%% sendto and recvfrom.
   api_b_sendto_and_recvfrom_udpL(suite) ->
       [];
   api_b_sendto_and_recvfrom_udpL(doc) ->
  
positive.code:                           end,
                     InitState = #{domain => inet,
                                   proto  => udp,
                                   send   => Send,
                                   recv   => Recv},
                     ok = api_b_send_and_recv_udp(InitState)
  
negative.code:          api_b_sendto_and_recvfrom_udp4/1,
           api_b_sendto_and_recvfrom_udpL/1,
           api_b_sendmsg_and_recvmsg_udp4/1,
           api_b_sendmsg_and_recvmsg_udpL/1,
           api_b_send_and_recv_tcp4/1,
           api_b_send_and_recv_tcpL/1,
           api_b_sendmsg_and_recvmsg_tcp4/1,
  