#include <M5Stack.h>
#include <M5LoRa.h>


void setup() {
  
  M5.begin();
  M5.Power.begin();
  // override the default CS, reset, and IRQ pins (optional)
  LoRa.setPins(); // default set CS, reset, IRQ pin
  Serial.println("LoRa Receiver");
  M5.Lcd.println("LoRa Receiver");

  // frequency in Hz (433E6, 866E6, 915E6)
  if (!LoRa.begin(433E6)) {
    Serial.println("Starting LoRa failed!");
    M5.Lcd.println("Starting LoRa failed!");
    while (1);
  }

  // LoRa.setSyncWord(0x69);
  Serial.println("LoRa init succeeded.");
  M5.Lcd.println("LoRa init succeeded.");
}

void loop() {
  // try to parse packet
  int packetSize = LoRa.parsePacket();
  if (packetSize) {
    // received a packet
    Serial.print("Received packet: \"");
    M5.Lcd.print("Received packet: \"");

    // read packet
    while (LoRa.available()) {
      char ch = (char)LoRa.read();
      Serial.print(ch);
      M5.Lcd.print(ch);
    }

    // print RSSI of packet
    Serial.print("\" with RSSI ");
    Serial.println(LoRa.packetRssi());
    M5.Lcd.print("\" with RSSI ");
    M5.Lcd.println(LoRa.packetRssi());
  }
}