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

#define SCK     5    // GPIO5  -- SX1278's SCK
#define MISO    19   // GPIO19 -- SX1278's MISO
#define MOSI    27   // GPIO27 -- SX1278's MOSI
#define SS      18   // GPIO18 -- SX1278's CS
#define RST     14   // GPIO14 -- SX1278's RESET
#define DI0     26   // GPIO26 -- SX1278's IRQ(Interrupt Request)

void setup() {
  Serial.begin(9600);
  while (!Serial);

  Serial.println("LoRa Receiver");

  SPI.begin(SCK, MISO, MOSI, SS);
  LoRa.setPins(SS, RST, DI0);

  if (!LoRa.begin(866E6)) {
    Serial.println("Starting LoRa failed!");
    while (1);
  }
  Serial.println("LoRa started!");
}

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

    // read packet
    while (LoRa.available()) {
      Serial.print((char)LoRa.read());
    }

    // print RSSI of packet
    Serial.print("' with RSSI ");
    Serial.println(LoRa.packetRssi());
  }
}