So for a heads up, I'm not using any 220 Ohms resistors and directly plugging in the LED, so correct me if I REALLY need that.
What is it you are smoking? By what feat of prestidigitation do you now imagine that the space time continuum has been altered such that the laws of physics do not apply in your local environment and you do not need a 220 ohm resistor when it is specified that you need one?
It did occur to me to suggest that you try the Serial Monitor, and you have and it works. I am not familiar with "Processing" which is clearly now the problem here, so cannot help you there much. Did you modify something other than the port number? Does the box highlight as you mouse over it?
Well, the hardware requirements doesn't say I needed a 220 resistor, it only showed up on the schematics. And also later on I did a parallel connection of 4 1K ohm resistors to roughly get close to 220 because i simply don't have a 220 lying around freely and need to drive a good 20 minutes just to get a 220 resistor. Thanks for the reminder though.
And the box does highlight when i mouse over it, but it just doesn't send the 'L' letter back, although I clearly see the TX light blinking rapidly all the way through.
Sounds as if there is some problem either with the baudrate, or this is one of the cases where there is an error in the "examples" and this would be far from the first time that has happened. I have yet to learn "processing" so I am of little help here and with all good intentions, I probably cannot find the time to do so at this moment. I must suspect that the fact that no-one else has chimed in with the solution, implies that it is not particularly popular with those who contribute here.