 // NSS pin:   7
 // DIO0 pin:  2
 // DIO1 pin:  3
-// IMPORTANT: because this example uses external 
-//            interrupts, DIO0 MUST be connected
-//            to Arduino pin 2 or 3. DIO1 can be
-//            connected to any free pin.
+// IMPORTANT: because this example uses external interrupts,
+//            DIO0 MUST be connected to Arduino pin 2 or 3.
+//            DIO1 MAY be connected to any free pin 
+//            or left floating.
 SX1278 lora = new LoRa;
 
 void setup() {

    while (true);
  }

  // the 'listen' mode can be disabled by calling:
  // lora.standby()
  // lora.sleep()
  // lora.transmit();
  // lora.receive();
}

// this function is called when a complete packet
// is received by the module
// IMPORTANT: this function MUST be 'void' type
//            and MUST NOT have any arguments!
void handlePacket(void) {
  // you can receive data as an Arduino String
  String str;
  int state = lora.readData(str);

  // you can also receive data as byte array
  /*
    byte byteArr[8];
    int state = lora.receive(byteArr, 8);
  */
  
  if (state == ERR_NONE) {
    // packet was successfully received
    Serial.println("Received packet!");

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

    // print RSSI (Received Signal Strength Indicator) 
    // of the last received packet
    Serial.print("RSSI:\t\t");
    Serial.print(lora.lastPacketRSSI);
    Serial.println(" dBm");

    // print SNR (Signal-to-Noise Ratio) 
    // of the last received packet
    Serial.print("SNR:\t\t");
    Serial.print(lora.lastPacketSNR);
    Serial.println(" dBm");

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

  }
}

void loop() {
  // nothing here

}


  // set the function that will be called 
  // when new packet is received
  lora.onReceive(setFlag);
  
  // start listening for LoRa packets
  Serial.print(F("Starting to listen ... "));
