#include "Arduino.h"
#include "heltec.h"
//#include "WiFi.h"

#define BAND    868E6

float snr = 0;
String rssi = "RSSI --";  //rssi value
String packSize = "--";   // size
double latitude;
double longitude;
float latconv;
float longconv;
String packet;            // stores last packet
unsigned int counter = 0; // counter for recieved packets
bool receiveflag = false; // software flag for LoRa receiver, received data makes it true.
uint32_t LatitudeBinary, LongitudeBinary;

bool deepsleepflag=false;

void setup()
{
  Heltec.begin(true /*DisplayEnable Enable*/, true /*LoRa Enable*/, true /*Serial Enable*/, true /*LoRa use PABOOST*/, BAND /*LoRa RF working band*/);
//######################################################

  LoRa.setSpreadingFactor(12);
 //LoRa.setSignalBandwidth(500E3);

//#######################################################
  LoRa.onReceive(onReceive);
  LoRa.receive();
  displaySendReceive();
}
void loop()
{
 if(deepsleepflag)
  {
  LoRa.end();
  LoRa.sleep();
  delay(100);
  pinMode(4,INPUT);
  pinMode(5,INPUT);
  pinMode(14,INPUT);
  pinMode(15,INPUT);
  pinMode(16,INPUT);
  pinMode(17,INPUT);
  pinMode(18,INPUT);
  pinMode(19,INPUT);
  pinMode(26,INPUT);
  pinMode(27,INPUT);
  digitalWrite(Vext,HIGH);
  delay(2);
  esp_deep_sleep_start();
  }

 if(receiveflag)
  {
  digitalWrite(LED, HIGH);
  counter++;
  digitalWrite(25,HIGH);
  displaySendReceive();
  delay(1000);
  receiveflag = false;
  digitalWrite(LED, LOW);
  LoRa.receive();
  displaySendReceive();
  }
}

void displaySendReceive()
  {
  Heltec.display -> drawString(0, 50, "Counter " + (String)(counter-1));
  Heltec.display -> drawString(0, 0, "Received Size " + packSize);
  Heltec.display -> drawString(0, 10, String(latconv, 10));
  Heltec.display -> drawString(0, 20, String(longconv, 10));
  Heltec.display -> drawString(0, 30, String(latitude) + " " + String(longitude));
  Heltec.display -> drawString(0, 40, "RSSI  " + rssi + "db " + "  SNR " + String(snr, 2));
  Heltec.display -> display();
  delay(100);
  Heltec.display -> clear();
  }
void onReceive(int packetSize)//LoRa receiver interrupt service
{
  //if (packetSize == 0) return;
  packet = "";
  packSize = String(packetSize,DEC);

  while (LoRa.available())
   {
    packet += (char) LoRa.read();
   }

  Serial.println(packet);
  rssi = String(LoRa.packetRssi(), DEC);
  snr = LoRa.packetSnr();
  receiveflag = true;

  latitude = ((packet[0]<<16)) + ((packet[1]<<8)) + packet[2];
  latconv = (latitude / 16777215.0 * 180) - 90;

  longitude = ((packet[3]<<16)) + ((packet[4]<<8)) + packet[5];
  longconv = (longitude / 16777215.0 * 360) - 180;
}