#include "Arduino.h"

#define LED_PIN 2 // Define the GPIO pin number for the LED

void setup() {
  Serial.begin(115200); // Initialize the default UART0 for communication
  pinMode(LED_PIN, OUTPUT); // Set the LED pin as an output
}

void loop() {
  // Check if data is available to read from UART0
  if (Serial.available()) {
    String receivedString = Serial.readStringUntil('\n'); // Read the incoming string until newline character
    receivedString.trim(); // Remove any leading/trailing whitespace
    
    // For debugging, print the received string to the Serial Monitor
    Serial.println("Received: " + receivedString);
    
    // Check the received string and control the LED accordingly
    if (receivedString == "l1=1") {
      digitalWrite(LED_PIN, HIGH); // Turn LED ON
      Serial.println("LED ON"); // Echo back for confirmation
    } else if (receivedString == "l1=0") {
      digitalWrite(LED_PIN, LOW); // Turn LED OFF
      Serial.println("LED OFF"); // Echo back for confirmation
    }
  }

  // Add a small delay to give some time back to the CPU
  delay(10);
}