unsigned long start;
unsigned long simMillis;

void setup() {
  Serial.begin(115200);
  Serial.println("Setup-Start");
  // 4 before max 4294967295
  simMillis     = 4294967291; 
  start = simMillis;

  for (byte i = 0; i <= 10; i++) {
    Serial.print("simMillis=");
    Serial.print(simMillis);

    Serial.print("  start=");
    Serial.println(start);

    Serial.println("simMillis - start");
    Serial.print(simMillis);
    Serial.print(" - ");
    Serial.print(start);
    Serial.print(" = ");
    Serial.println(simMillis - start);
    Serial.println();
    simMillis++;  
  }
}


void loop() {
}