//modified lora library by Sandeep Mistry for TTGO T-BEAM LORA ESP32 GPS
// lora receiverCallBack modified by HwThinker

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

#define SCK     5    // GPIO5  -- lora SCK
#define MISO    19   // GPIO19 -- lora MISO
#define MOSI    27   // GPIO27 -- lora MOSI
#define SS      18   // GPIO18 -- lora CS
#define RST     23   // GPIO23 -- RESET 
#define DI0     26   // GPIO26 -- IRQ(Interrupt Request)
#define BAND    915E6 // 915MHz modifikasi Frekuensi Band lora sesuai dengan Lora anda
//#define BAND    433E6 //433MHz  modifikasi Frekuensi Band lora sesuai dengan Lora anda

void setup() {
  Serial.begin(9600);
  while (!Serial);
  SPI.begin(SCK, MISO, MOSI, SS);
  LoRa.setPins(SS, RST, DI0);


  Serial.println("LoRa Receiver Callback");

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

  // register the receive callback
  LoRa.onReceive(onReceive);

  // put the radio into receive mode
  LoRa.receive();
}

void loop() {
  // do nothing
}

void onReceive(int packetSize) {
  // received a packet
  Serial.print("Received packet '");

  // read packet
  for (int i = 0; i < packetSize; i++) {
    Serial.print((char)LoRa.read());
  }

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