Wrapper of libartnet for OF 007 on OSX 10.6 and 10.7. May be useful for Linux and M$ too - see libartnet docs.
Can send to multiple artnet devices on the same network subnet if specifying sendRaw in the setup() function.
Receiving callback is untested but should work for a single artnet device.
Based on code here: http://www.opendmx.net/index.php/IPad_ArtNet_Node Thanks to help from the OLA community