UDP is an unreliable packet oriented network protocol. This is the datagram partner to the stream oriented TCP. The Tcl core has supported TCP sockets with the [socket] comment since version 7.something but UDP must be supplied by an extension. The following extensions provide UDP support:

   * [Tcl-dp]
   * [Scotty]
   * [pktsrc]
   * TclUDP

The TclUDP package has recently been enhanced to support the TEA2 build system and to enable the transmission of binary data. This package works with unix and Windows versions of Tcl. It is now a project at [sourceforge] [http://sourceforge.net/projects/tcludp]

Also http://students.cs.tamu.edu/mmiller/tcl/channel.html .

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''UDP using packages''

In [tcllib] - the [dns] package is capable of using udp if available. Also the forthcoming time and ntp packages. [[[PT]]]

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30Jan2003 [Mike Tuxford] It was mentioned in c.l.t that there aren't many examples of tcludp usage around so I'll add this simple one that listens on port 1434 which is the MSSQL port and has been in the news a lot lately due to major exploits.

 proc udpEventHandler {} {
   global fd
   puts "event triggered..."
   puts "Data: [gets $fd(udp)]"
   puts "Peer: [udp_conf $fd(udp) -peer]"
   return
 }
 
 set fd(udp) [udp_open 1434]
 fileevent $fd(udp) readable udpEventHandler
 puts "Listening on udp port: [udp_conf $fd(udp) -myport]"
 
 vwait __forever__

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