So, when I said to increase the serial baud rate, why do you think that the baud rate between the Uno and Processing has ANYTHING to do with the baud rate between the Mega and the control unit?
I am so sorry, because it seems that I misunderstood you. So just to clarify things, you are saying that if I change the baud rate on the Uno, I will not get a lot of junk data? What I mean is, I was under the impression that whenever two devices (say an Uno and a Mega) try to serially communicate with each other with mismatched baud rates, I would get a lot of nonsense displayed on the serial monitor. For example in this case because the Mega is wirelessly sending the data at 19200 bps, I thought I need to have the Uno's Serial also running at 19200 bps.