luasocket/samples/echoclnt.lua

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host = host or "localhost"
port = port or 7
if arg then
host = arg[1] or host
port = arg[2] or port
end
host = toip(host)
udp, err = udpsocket()
if not udp then print(err) exit() end
err = udp:setpeername(host, port)
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if err then print(err) exit() end
print("Using host '" ..host.. "' and port " .. port .. "...")
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while 1 do
line = read()
if not line then exit() end
err = udp:send(line)
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if err then print(err) exit() end
dgram, err = udp:receive()
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if not dgram then print(err) exit() end
print(dgram)
end