void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");

  char output[6];
  String imageFile = "1234567890";
  int fbLen=imageFile.length();
Serial.println(imageFile);
  for (int n=0; n<fbLen; n=n+5) {      
      if (n+5<fbLen) {
        Serial.println("part");
          strncpy(output, imageFile.c_str(), 5);
          output[5] = 0;
      }
      else if (fbLen%5>0) {
        Serial.println("end");
          size_t remainder = fbLen%5;
          strncpy(output, imageFile.c_str(), remainder);
          output[5] = 0;
        }
        
        Serial.println(output);
  }
}


void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
}