#include “Wire.h”

int i2cAddress = 0x03;

void setup() {
  Wire.begin(i2cAddress);
  Wire.onReceive(receiveEvent);
}
 
void receiveEvent(int size) {
  if (size == 2) {
    int header = Wire.read();
    int dataRead = Wire.read();
    if (header == 0xC9) {
      // Do something
    }
  }
}
