In my project work, I have 3 robots with their own Arduino boards. Each robot has Infra Red Sensors, whose values I can read using its corresponding Arduino. The main thing however is that each robot must have every other Robots' values. Can anyone suggest me a suitable strategy? I tried using the Processing Software, using which I am able to read all the values from all the robots but sending them back to the robots is turning out to be a problem! It says ports are busy! Any help would be great!