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Erlang Sending a Message on the Port

-module(helloworld). 
-export([start/0]). 

start() ->
   {ok, Socket} = gen_udp:open(8789), 
   io:fwrite("~p",[Socket]), 
   io:fwrite("~p",[gen_udp:send 
   (Socket,"localhost",8789,"Hello")]).

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