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host = host or "127.0.0.1"
port = port or 7
if arg then
host = arg[1] or host
port = arg[2] or port
end
print("Binding to host '" ..host.. "' and port " ..port.. "...")
udp, err = udpsocket()
if not udp then print(err) exit() end
err = setsockname(udp, host, port)
if err then print(err) exit() end
timeout(udp, 5)
ip, port = getsockname(udp)
print("Waiting packets on " .. ip .. ":" .. port .. "...")
while 1 do
dgram, ip, port = receivefrom(udp)
if not dgram then print(ip)
else
print("Echoing from " .. ip .. ":" .. port)
sendto(udp, dgram, ip, port)
end
end
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