From: "Luis G." <l17339@...>
Date: 2010-12-17T21:09:02+09:00
Subject: Re: How to do UDP calls

Hello again.

Man, thanks a lot for you time. You've been a really great help.

first question, shouldn't the array just contain 3 element?
64-bit integer  connection_id  0x41727101980
32-bit integer  action          0
32-bit integer  transaction_id  16

I tried to run the script with the information you gave me. So far I 
have this:

host = 'tracker.openbittorrent.com'
port = 80
connection_id = 0x41727101980

s = [connection_id >> 32, connection_id & 0xffffffff, 0, 
16].pack('NNNN')

sock = UDPSocket.open
sock.connect(host, port)
sock.send(s, 0)
response = sock.recvfrom(1024)

And actually now I have something in the 'response' variable. If I print 
the content I got something like

["\000\000\000\000\000\000\000\020#B\005\027�AP\377",
 ["AF_INET", 80, "tracker.openbittorrent.com", "95.215.62.5"]]

And STDERR.puts response.unpack("H*").first will return
>> 000000000000001023420517de4150ff

In the documentation says that 'Check whether the transaction ID is 
equal to the one you chose.'. So basically I should get the same value I 
sent, right?

Thanks,

Luis

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