/*
  RadioLib LR2021 Blocking Receive Example

  This example listens for LoRa transmissions using LR2021 Lora modules.
  To successfully receive data, the following settings have to be the same
  on both transmitter and receiver:
  - carrier frequency
  - bandwidth
  - spreading factor
  - coding rate
  - sync word
  - preamble length

  Using blocking receive is not recommended, as it will lead
  to significant amount of timeouts, inefficient use of processor
  time and can some miss packets!
  Instead, interrupt receive is recommended.

  For default module settings, see the wiki page
  https://github.com/jgromes/RadioLib/wiki/Default-configuration#lr2021---lora-modem

  For full API reference, see the GitHub Pages
  https://jgromes.github.io/RadioLib/
*/

// include the library
#include <RadioLib.h>

// LR2021 has the following connections:
// NSS pin:   10
// IRQ pin:   2
// NRST pin:  3
// BUSY pin:  9
LR2021 radio = new Module(10, 2, 3, 9);

// or detect the pinout automatically using RadioBoards
// https://github.com/radiolib-org/RadioBoards
/*
#define RADIO_BOARD_AUTO
#include <RadioBoards.h>
Radio radio = new RadioModule();
*/

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

  // LR2021 allows to use any DIO pin as the interrupt
  // as an example, we set DIO10 to be the IRQ
  // this has to be done prior to calling begin()!
  radio.irqDioNum = 10;

  // initialize LR2021 with default settings
  Serial.print(F("[LR2021] Initializing ... "));
  int state = radio.begin();
  if (state == RADIOLIB_ERR_NONE) {
    Serial.println(F("success!"));
  } else {
    Serial.print(F("failed, code "));
    Serial.println(state);
    while (true) { delay(10); }
  }
}

void loop() {
  Serial.print(F("[LR2021] Waiting for incoming transmission ... "));

  // you can receive data as an Arduino String
  String str;
  int state = radio.receive(str);

  // you can also receive data as byte array
  /*
    byte byteArr[8];
    int state = radio.receive(byteArr, 8);
  */

  if (state == RADIOLIB_ERR_NONE) {
    // packet was successfully received
    Serial.println(F("success!"));

    // print the data of the packet
    Serial.print(F("[LR2021] Data:\t\t"));
    Serial.println(str);

    // print the RSSI (Received Signal Strength Indicator)
    // of the last received packet
    Serial.print(F("[LR2021] RSSI:\t\t"));
    Serial.print(radio.getRSSI());
    Serial.println(F(" dBm"));

    // print the SNR (Signal-to-Noise Ratio)
    // of the last received packet
    Serial.print(F("[LR2021] SNR:\t\t"));
    Serial.print(radio.getSNR());
    Serial.println(F(" dB"));

  } else if (state == RADIOLIB_ERR_RX_TIMEOUT) {
    // timeout occurred while waiting for a packet
    Serial.println(F("timeout!"));

  } else if (state == RADIOLIB_ERR_CRC_MISMATCH) {
    // packet was received, but is malformed
    Serial.println(F("CRC error!"));

  } else {
    // some other error occurred
    Serial.print(F("failed, code "));
    Serial.println(state);

  }
}
