yes, I already did some work, I made simple artnetnode from arduino and arduinoethernetshield, it takes 64ch of dmx...now but belive all 512ch universe could be done. ....setup cost.. less than $70 ...working on english version of wiki pages .
I know LLA and I did some nice router usb dmx mod with this concept and connected software few years ago. Its working now fluently 3rd month in some arch. instalation.