Max Msp, Arduino, Led Matrix 6x6

Hello,

I am currently working on a project that involves 6x6 Leds and a camera.
I used the TLC 5940 library for arduino to drive the Leds. Now I am trying to make Max and Arduino speaking together using serial 115200 but i can't manage to make it work.
I attached the arduino file and find below my max/msp code
Would be great to get some help. I have been seeking on the net but could not find anything. I have been a bit stuck to be honest.

Thanks a lot

test_Led.maxpat (173 KB)

_6x6_matrix_Arduino.ino (2.8 KB)