From: Hamid Rasoulian <hrasoulian@...>
Date: 2006-06-20T05:22:50+09:00
Subject: How to get the response from a UDP socket.

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Problem.  I set up a UDP socket connection. I send a message to the
socket, and the destination device  receives the message correctly and
act upon it, so far so good, but the destination device would send a
message back to the host and I do not know how to capture that message
and print the message.=20

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Here is what I do, the local port is $port1 and $IP1 and the destination
assume to be $port2 and $IP2

I do the following:

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require  'socket'

$port1 =3D 5000

$IP1 =3D '10.15.0.21'

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$port2 =3D 15000

$IP2 =3D '10.15.0.66'

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sock =3D UDPSocket.open

sock.bind($IP1 , $port1)

sock.connect($IP2 , $port2)

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server_thread =3D Thread.start do

  server =3D UDPSocket.open

  server.bind(nil, $port1)

  2.times { p server.recvfrom(64) }

end

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#  now I send the message to device.

sock.send (" my UDP message", 0)

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# and immediately I enter this command

server_thread.join

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But nothing happens. And no receiving message is being printed out,
while I am sure the device has sent some message back.

I just do not understand the receiving part of it.

Can any body  help me with it.

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