void setup() {
    Serial.begin(9600);  // Start Serial Communication
    pinMode(12, INPUT_PULLUP);  // Button Input
    pinMode(8, OUTPUT);  // LED Output
}

void loop() {
    #if defined(WOKWI_BOARD_ID_UNO1)  // First Board (uno1)
        if (digitalRead(12) == LOW) {  // If button is pressed
            Serial.println("1");  // Send "1" to second board
            Serial.flush();  // Ensure the data is sent completely
        }
        if (Serial.available()) {
            char received = Serial.read();
            if (received == '2') {
                digitalWrite(8, HIGH);  // Turn LED ON
                delay(10);
                digitalWrite(8, LOW);   // Turn LED OFF
            }
        }

    #elif defined(WOKWI_BOARD_ID_UNO)  // Second Board (uno)
        if (digitalRead(12) == LOW) {  // If button is pressed
            Serial.println("2");  // Send "2" to first board
            Serial.flush();
        }
        if (Serial.available()) {
            char received = Serial.read();
            if (received == '1') {
                digitalWrite(8, HIGH);  // Turn LED ON
                delay(10);
                digitalWrite(8, LOW);   // Turn LED OFF
            }
        }
    #endif
}