#include <HardwareSerial.h>

#define LORA_UART Serial2
#define LORA_TX_PIN 17  // GPIO17 for TX
#define LORA_RX_PIN 16  // GPIO16 for RX

#define RELAY_PIN 13  // GPIO pin to control the relay

void setup() {
  Serial.begin(115200);  // Main serial for debugging
  LORA_UART.begin(9600, SERIAL_8N1, LORA_RX_PIN, LORA_TX_PIN);  // Initialize UART for LoRa
  
  pinMode(RELAY_PIN, OUTPUT);  // Set the relay pin as output
  digitalWrite(RELAY_PIN, LOW);  // Ensure the relay is off at startup

  if (LORA_UART) {
    Serial.println("LoRa Receiver Initialized");
  } else {
    Serial.println("LoRa Receiver Initialization Failed");
  }
}
 
void loop() {
  // Check for incoming LoRa messages via UART
  if (LORA_UART.available()) {
    String incoming = "";
    while (LORA_UART.available()) {
      char receivedChar = (char)LORA_UART.read();
      Serial.print(receivedChar);  // Print each received character
      incoming += receivedChar;
    }
    Serial.println("\nReceived via LoRa: " + incoming);

    // Handle relay commands
    if (incoming == "turn_on_front_sprinkler") {
      digitalWrite(RELAY_PIN, HIGH);  // Turn on the relay
      Serial.println("Relay turned on");
    } else if (incoming == "turn_off_front_sprinkler") {
      digitalWrite(RELAY_PIN, LOW);  // Turn off the relay
      Serial.println("Relay turned off");
    }
  }

  // Check for Serial Monitor command
  if (Serial.available()) {
    String command = Serial.readStringUntil('\n');
    command.trim();  // Remove any extra whitespace

    if (command == "restart") {
      Serial.println("Restarting Receiver...");
      delay(1000);  // Give time for message to print
      ESP.restart();
    } else if (command == "test") {
      LORA_UART.print("Test message from Receiver");
      Serial.println("Sent test message via LoRa");
    }
  }

  delay(1000);  // Add a delay to avoid watchdog timer reset
}