#define LED_PIN D10

bool blinkMode = false;
bool ledState = false;
unsigned long lastBlinkTime = 0;

void setup() {
  Serial.begin(115200);
  Serial.setTimeout(20);

  pinMode(LED_PIN, OUTPUT);
  digitalWrite(LED_PIN, LOW); // apagado
}

void loop() {

  if (Serial.available()) {
    String command = Serial.readStringUntil('\n');
    command.trim();

    if (command == "ON") {
      blinkMode = false;
      digitalWrite(LED_PIN, HIGH);
      Serial.println("ON");
    }

    else if (command == "OFF") {
      blinkMode = false;
      digitalWrite(LED_PIN, LOW);
      Serial.println("OFF");
    }

    else if (command == "BLINK") {
      blinkMode = true;
      Serial.println("BLINK");
    }
  }

  if (blinkMode) {
    if (millis() - lastBlinkTime > 300) {
      lastBlinkTime = millis();
      ledState = !ledState;
      digitalWrite(LED_PIN, ledState ? HIGH : LOW);
    }
  }
}