Hi,
the quick and dirty solution for you is this:
Hardware setup:
-flash the bin with esptool into your esp8266.
-connect 3 cables to your ESP8266
(+5V,GND, 510 Ohm resistor + LED signal)
Software setup:
-connect to your new esp artnet node via browser and config your WiFi parameters
-install additional DMX and Artnet plugin
Easy going, 5 minutes work.
Enjoy OpenHAB2 with you Pixel strip
Cheers
Chrimo
BTW: works perfect with any DMX fixtures