#include <DHT.h>
#include <SPI.h>  // SPI is kept in case you want to add a LoRa module later

#define DHTPIN 4          // DHT22 data pin
#define DHTTYPE DHT22     // Define the DHT type
DHT dht(DHTPIN, DHTTYPE);  // Initialize DHT sensor

#define GAS_SENSOR_PIN 34  // MQ gas sensor pin
#define PIR_SENSOR_PIN 27  // PIR motion sensor pin

#define RX_PIN 16    // Define RX pin for Receiver ESP32 (GPIO16)
#define TX_PIN 17    // Define TX pin for Receiver ESP32 (GPIO17)

void setup() {
  Serial.begin(115200);   // Start Serial Monitor at 115200 baud rate
  Serial2.begin(115200, SERIAL_8N1, RX_PIN, TX_PIN); // Start Serial2 for communication

  // Initialize sensor
  dht.begin();
  pinMode(GAS_SENSOR_PIN, INPUT);
  pinMode(PIR_SENSOR_PIN, INPUT);

  Serial.println("Ready for Transmitting and Receiving...");
}

void loop() {
  // Transmitting Data (Send data from this ESP32 to itself)
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  int gasValue = analogRead(GAS_SENSOR_PIN);
  int pirState = digitalRead(PIR_SENSOR_PIN);
  String motionStatus = (pirState == HIGH) ? "Motion Detected!" : "No Motion";

  // Send data over Serial2 (Simulate LoRa Transmission)
  String sendData = "Temp: " + String(temperature) + "C, Humidity: " + String(humidity) + "%, Gas: " + String(gasValue) + ", Motion: " + motionStatus;
  Serial2.println(sendData);  // Send data over Serial2 to the Receiver (same ESP32)
  Serial.println("Data Sent: " + sendData);  // Print data in Serial Monitor for sender

  // Receiver Logic (Check if data is being received from the same ESP32)
  if (Serial2.available()) {
    String receivedData = Serial2.readString();  // Receive data from Serial2
    Serial.print("Received: ");
    Serial.println(receivedData);  // Print received data in Serial Monitor
  }

  delay(5000);  // Wait 5 seconds before the next transmission
}