Google Cloud OTA Update Post - Blink

blink.cpp

void setup(){
  /* ... */  
  pinMode(LED_BUILTIN, OUTPUT);
}

int ledState = LOW;
const long interval = 1000;
unsigned long previousMillis = 0;

void loop()
{

  unsigned long currentMillis = millis();

  if (currentMillis - previousMillis >= interval) {    
    previousMillis = currentMillis;
    ledState = ledState == LOW ? HIGH : LOW;
    digitalWrite( BUILTIN_LED, ledState );
  }
  
  // Just chill
  server.handleClient();
}