sadp send discovery

sadp_discovery.rb

require 'socket'

MULTICAST_ADDR = "239.255.255.250" 
PORT= 37020 
MSG = "<?xml version=\"1.0\" encoding=\"utf-8\"?><Probe><Uuid>13A888A9-F1B1-4020-AE9F-05607682D23B</Uuid><Types>inquiry</Types></Probe>"
begin
  socket = UDPSocket.open
  socket.setsockopt(Socket::IPPROTO_IP, Socket::IP_TTL, [1].pack('i'))
  socket.send(MSG, 0, MULTICAST_ADDR, PORT)
ensure
  socket.close 
end

sadp_listener.rb

require 'socket'
require 'ipaddr'

MULTICAST_ADDR = "239.255.255.250" 
PORT= 37020 
begin
  ip = IPAddr.new(MULTICAST_ADDR).hton + IPAddr.new("0.0.0.0").hton
  socket = UDPSocket.new
  socket.setsockopt(Socket::IPPROTO_IP, Socket::IP_ADD_MEMBERSHIP, ip)
  socket.bind(Socket::INADDR_ANY, PORT)
  loop do
    msg, info = socket.recvfrom(1024)
    puts "MSG: #{msg} from #{info[2]} (#{info[3]})/#{info[1]} len #{msg.size}" 
  end
ensure
  socket.close 
end