#define MAX_STRING_SIZE 256
#define DIVIDER 0

char * myString;
int stringPosition = 0;

byte counter = 0;
byte subCounter = 0;

void setup(){
  Serial.begin(9600);
  
  myString = (char *)malloc(sizeof(char) * MAX_STRING_SIZE);
  memset(myString, 0xff, MAX_STRING_SIZE);
}

void serialEvent(){
  while(Serial.available()){
    myString[stringPosition++] = Serial.read();
  }
  
  if(myString[stringPosition - 1] == '\r' || myString[stringPosition - 1] == '\n'){
    // Uncomment to write the counter that is incremented by loop()
    //Serial.write(counter);
    Serial.write(stringPosition);
    memset(myString, 0xff, MAX_STRING_SIZE);
    stringPosition = 0;
  }
}

void loop(){
  if(subCounter++ % DIVIDER == 0){
    counter++;
  }
}