-module(helloworld).
-export([start/0,client/1]).
start() ->
spawn(fun() -> server(4000) end).
server(Port) ->
{ok, Socket} = gen_udp:open(Port, [binary, {active, false}]),
io:format(server opened socket:~p~n,[Socket]),
loop(Socket).
loop(Socket) ->
inet:setopts(Socket, [{active, once}]),
receive
{udp, Socket, Host, Port, Bin} ->
io:format(server received:~p~n,[Bin]),
gen_udp:send(Socket, Host, Port, Bin),
loop(Socket)
end.
client(N) ->
{ok, Socket} = gen_udp:open(0, [binary]),
io:format(client opened socket=~p~n,[Socket]),
ok = gen_udp:send(Socket, localhost, 4000, N), Value = receive
{udp, Socket, _, _, Bin} ->
io:format(client received:~p~n,[Bin]) after 2000 ->
0
end,
gen_udp:close(Socket),
Value.
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