ArtNet library for Arduino
If you’re into interactive lighting you’ll be familiar with protocols like DMX and ArtNet.
VVVV user “karistouf” has written a piece of code for the Ethernet shield that allows your Arduino to communicate over an ArtNet network.
ArtNet receiver v2: fixed artnet length receiver.
ArtNet sender: you can send artnet data from your device over network, for sensors and buttons this will be easier than all osc or firmata solutions.