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 = udp:setsockname(host, port) if err then print(err) exit() end udp:timeout(5) ip, port = udp:getsockname() print("Waiting packets on " .. ip .. ":" .. port .. "...") while 1 do dgram, ip, port = udp:receivefrom() if not dgram then print(ip) else print("Echoing from " .. ip .. ":" .. port) udp:sendto(dgram, ip, port) end end