I've seen youtube videos of an arduino sending data to a fonera router. What I would like to know is how one would setup a webserver on the fonera (with dd-wrt I am sure) and have it send data to the arduino over it's serial port. For example, let's say I ahve an LED on the arduino that I want to turn on and off with the webserver built into the fonera. How would I have a webpage/script send data over the serial port?