Chapter 27 of Real World Haskell http://book.realworldhaskell.org/read/sockets-and-syslog.html explains a way to send a message over UDP. From a folder containing the two files "syslogclient.hs" and "SyslogTypes.hs" (which are attached to this email, and also available here http://book.realworldhaskell.org/read/sockets-and-syslog.html), supposedly one can run these three commands from GHCI, to send the message "This is my message" to localhost, port number 514: :load syslogclient.hs h <- openlog "localhost" "514" "testprog" syslog h USER INFO "This is my message" I have a Max/MSP patch that accepts UDP on localhost port number 9000. I substitute 514 -> 9000 and run that, and I get nothing. I know the Max/MSP "udpreceive" object is working, because from Python, using the aiosc module, I can run aiosc.send(('127.0.0.1', 9000), "This is a message from Python") ) and "This is a message from Python" reaches Max. There is a UDP library http://hackage.haskell.org/package/network-conduit-0.6.1.1/docs/Data-Conduit... for Haskell, which I presume could serve as an alternative to the RWH code, but I don't understand it. I run OS X 10.9 on an early 2011 MBP. Many thanks, Jeff