// EMPFÄNGER

#include <LoRa.h>
#include <SPI.h>

#define ss 5
#define rst 14
#define dio0 4
#define ledPin 2  // On-board LED pin. Change if different for your board.

void setup() {
  pinMode(ledPin, OUTPUT);  // Set the LED pin as an output
  digitalWrite(ledPin, LOW);  // Ensure LED is off

  delay(1000);
  Serial.begin(115200);
  while (!Serial);
  delay(1000);
  Serial.println("LoRa Receiver");

  LoRa.setPins(ss, rst, dio0);  // Setup LoRa transceiver module
  LoRa.setSyncWord(0xab);
  LoRa.setSpreadingFactor(7);
  LoRa.setSignalBandwidth(125E3);
  LoRa.setCodingRate4(5);
  LoRa.setTxPower(14);

  while (!LoRa.begin(433E6)) {  // Initialize LoRa at 433 MHz
    Serial.println(".");
    delay(500);
  }

  Serial.println("LoRa Initializing OK!");
}

void loop() {
  int packetSize = LoRa.parsePacket();  // Try to parse packet
  if (packetSize) {
    Serial.print("Received packet '");

    String LoRaData = "";
    while (LoRa.available()) {  // Read packet
      LoRaData += (char)LoRa.read();
    }
    Serial.print(LoRaData);
    Serial.print("' with RSSI ");
    Serial.println(LoRa.packetRssi());

    // Check if the received message is "Hello, LoRa!"
    if (LoRaData == "Hello, LoRa!") {
      // Blink the LED
      digitalWrite(ledPin, HIGH);  // Turn on LED
      delay(500);  // Wait for 500 milliseconds
      digitalWrite(ledPin, LOW);  // Turn off LED
    }
  }
}



// ----------------------------------------------------------------------
// SENDER


#include <SPI.h>
#include <LoRa.h>

// Define the LoRa module pins

#define ss 5
#define rst 14
#define dio0 4

void setup() {
  Serial.begin(115200);
  while (!Serial);
  Serial.println("LoRa Sender Test");

  // Setup LoRa transceiver module

  LoRa.setSyncWord(0xab);  // LoRa Sync Word
  LoRa.setSpreadingFactor(7); // Spreading Factor: Ranges from 6 to 12 (default is 7)
  LoRa.setSignalBandwidth(125E3); // Bandwidth: Lower bandwidth (125 kHz)
  LoRa.setCodingRate4(5); // Coding Rate: 4/5 for some added robustness
  LoRa.setTxPower(14);  
  LoRa.setPins(SS, RST, DI0);
  
  if (!LoRa.begin(433E6)) {
    Serial.println("Starting LoRa failed!");
    while (1);
  }
}

void loop() {
  Serial.println("Sending packet: Hello, LoRa!");
  
  // Send packet
  LoRa.beginPacket();
  LoRa.print("Hello, LoRa!");
  LoRa.endPacket();

  delay(2000);
}