I'm trying to run the WebClient example from Arduino IDE on an UDOO Quad (http://arduino.cc/en/Tutorial/WebClient). Do I need the Arduino Ethernet shield to run it ? If yes, is there a way to use the UDOO ethernet connexion in Arduino ?
yes, the Due chip does not have direct access to the wireless/ethernet on the i.MX6 side. Depending on what you are trying to do, it is possible to pass data from the Due to Linux and then have linux do something with it and sent results back to the due.. but at the most basic level that example would require the ethernet shield or something similar