------------------------------------------------------------------------------
------------------------------------------------------------------------------
-- This file is part of 'UDP Echo Demo', accompanies 'UDP' library.         --
--                                                                          --
-- (C) 2018 Stanislav Datskovskiy ( www.loper-os.org )                      --
-- http://wot.deedbot.org/17215D118B7239507FAFED98B98228A001ABFFC7.html     --
--                                                                          --
-- You do not have, nor can you ever acquire the right to use, copy or      --
-- distribute this software ; Should you use this software for any purpose, --
-- or copy and distribute it to anyone or in any manner, you are breaking   --
-- the laws of whatever soi-disant jurisdiction, and you promise to         --
-- continue doing so for the indefinite future. In any case, please         --
-- always : read and understand any software ; verify any PGP signatures    --
-- that you use - for any purpose.                                          --
--                                                                          --
-- See also http://trilema.com/2015/a-new-software-licensing-paradigm .     --
------------------------------------------------------------------------------
------------------------------------------------------------------------------

with Ada.Text_IO; use Ada.Text_IO;

with UDP;


procedure UDP_Echo_Demo is
   
   Socket           : UDP.Socket;
   
   --  Local_Endpoint   : UDP.Endpoint
   --    := (Address => UDP.IP_From_String("127.0.0.1"),
   --        Port    => 7000);
   
   Local_Endpoint   : UDP.Endpoint := (Address => UDP.INADDR_ANY,
                                       Port    => 7000);
   
   Received_Payload : UDP.Payload;
   Received_Origin  : UDP.Endpoint;
   Received_Valid   : Boolean;
   
begin
   Put_Line("Opening socket on local endpoint " &
              UDP.IP_To_String(Local_Endpoint.Address) &
              " :" & UDP.IP_Port'Image(Local_Endpoint.Port) & "...");
   
   UDP.Open_Socket(Socket, Local_Endpoint);
   
   Put_Line("Waiting for payload...");
   
   UDP.Receive(Socket, Received_Origin, Received_Payload, Received_Valid);
   
   Put_Line("Received payload from " &
              UDP.IP_To_String(Received_Origin.Address) &
              " :" & UDP.IP_Port'Image(Received_Origin.Port) & "...");
   
   if Received_Valid then
      
      Put_Line("Sending received payload back to originator...");
      
      UDP.Transmit(Socket, Received_Origin, Received_Payload);
      
   else
      
      Put_Line("Received short payload, ignored.");
      
   end if;
   
   UDP.Close_Socket(Socket);
   
   Put_Line("Done.");

end UDP_Echo_Demo;