-----------------------------------------------------------------------------

-- UDP sample: echo protocol server

-- LuaSocket sample files

-- Author: Diego Nehab

-----------------------------------------------------------------------------

local socket = require("socket")

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 = assert(socket.udp())

assert(udp:setsockname(host, port))

assert(udp:settimeout(5))

ip, port = udp:getsockname()

assert(ip, port)

print("Waiting packets on " .. ip .. ":" .. port .. "...")

while 1 do

	dgram, ip, port = udp:receivefrom()

	if dgram then

		print("Echoing '" .. dgram .. "' to " .. ip .. ":" .. port)

		udp:sendto(dgram, ip, port)

	else

        print(ip)

    end

end