I just want to send a delay value with arduino but i thought let's start with sending the frameCount of the processing sketch.

arduino:

1. #define LED 13
   
   int incoming;
   
   void setup() {
     Serial.begin(9600);
     pinMode(LED, OUTPUT);
   }
   
   void loop() {
     if (Serial.available()) {
       incoming = Serial.read();
       Serial.println(incoming);
     }
   }

Processing:

1. import processing.serial.*;
   
   Serial port;
   
   void setup() {
    println(Serial.list());
    port = new Serial(this, Serial.list()[1], 9600);
   }
   
   void draw() {
     port.write(frameCount);
    
   }

This is the output i get in the Serial monitor from arduino (exept the last line):
Apart from it being messed up, also a lot of frames are not coming in...

1. 123
   5
   7
   8
   
   1112
   3
   15
   
   18
   
   2122
   3
   2526
   7
   29
   31
   32
   
   3536
   7
2. 
   
3. 1. fuck i hate this forum