On Feb 12, 2005, at 8:36 AM, John Rule wrote:
Maybe the problem is in doing broadcast messages in general on Windows
(this same code works fine on OSX...Linux is another issue altogether). It
doesn't work consistently (I do not always get the callback to my 'with'
message, the average is 6 out of 10).
Using a 'sniffer', I am ALWAYS getting my response from the devices. It
seems like it is just that the messages are not always finding their way
back to my callback handler (in Windows XP).
Is this a problem, or is there a better way?
If the devices are responding to the ip address and port that sent the query, then this might be your problem: The doc is lacking on using UDP. The callback for 'open datagram socket' is not for open. (It would be sent immediately, if it was.) It is for read. Scott Raney says to use that instead of read.
If the devices are not responding to the port that sent the broadcast, but to some specific port then I guess the above does not apply; you would be using accept. If the messages are very large or a very large number comes in at once, then Windows will lose some. There are some system parameters that can be tweeked, but I forgot what they are.
Dar
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