anchor.diff:  
   send_msg(Socket, Msg) ->
   %   ?debugFmt("~n~nsend message: ~p~n", [Msg]),
  -    {ok, Bin} = of_protocol:encode(Msg),
  +    {{ok, Bin}, Msg} = {of_protocol:encode(Msg), Msg},
       ok = gen_tcp:send(Socket, Bin).
   
   connect_aux(AuxId) ->
  
positive.code:                                 [{callback_module, of_driver_handler_mock},
                                   {listen_port, ?LISTEN_PORT},
                                   {init_opt, ConnTable}]],
      ok = application:start(eenum),
      ok = application:start(of_protocol),
      ok = application:start(lager),
      ok = application:start(of_driver),
      Socket = connect(),
      {Socket, ConnTable}.
  
  
negative.code:         version = ?VERSION, 
          type = packet_in,
          body = #ofp_packet_in{
              total_len = 5,
              buffer_id = no_buffer,
              reason = action,
              table_id = 1,
  