#include "SparkFun_Ublox_Arduino_Library.h" //http://librarymanager/All#SparkFun_Ublox_GPS
SFE_UBLOX_GPS myGPS;

long lastTime = 0; //Simple local timer. Limits amount if I2C traffic to Ublox module.
int counter = 0;
boolean gpsResponse; // GPS response

#define WAKEUP_PIN 32

void wakeUp() {
  pinMode(WAKEUP_PIN, OUTPUT);
  digitalWrite(WAKEUP_PIN, LOW);
  Serial.println("WAKING UP GPS VIA EXINT PIN");
  delay(500);
  digitalWrite(WAKEUP_PIN, HIGH);
  delay(500);
  
}

void setup() {

  Serial.begin(115200);
  
  Wire.begin();

  if (myGPS.begin() == false) //Connect to the Ublox module using Wire port
  {
    Serial.println(F("Ublox GPS not detected at default I2C address. Please check wiring. Freezing."));
    while (1);
  }

  myGPS.setI2COutput(COM_TYPE_UBX); //Set the I2C port to output UBX only (turn off NMEA noise)
  myGPS.saveConfiguration(); //Save the current settings to flash and BBR

  myGPS.enableDebugging(); //Enable debug messages over Serial (default)
  //myGPS.enableDebugging(SerialUSB); //Enable debug messages over Serial USB
  
}

void loop() {
  

  if (millis() - lastTime > 1000)
  {
    lastTime = millis(); //Update the timer

    // after 10 loops powers off GPS for 60s
    if (counter == 10) 
    {
      counter++;
      Serial.println("GPS POWER OFF for 60s -------------------------------------");

      
      gpsResponse = myGPS.powerOff(60000); // seems to be more reliable + INT pin works as wakeup too
      // gpsResponse = myGPS.powerOffWithInterrupt(60000);
      
      Serial.println("Response from GPS " + String(gpsResponse));

      delay(1000);
     
    } 
    // wakes up the device after 30 loops and resets counter
    else if (counter == 30) 
    {
      counter = 0;

      // use for pin wakeUp
      wakeUp();

      
      }
    else
    {
      counter++;

      // wake up by querying
      /*
      long latitude = myGPS.getLatitude();
      Serial.print(F("Lat: "));
      Serial.print(latitude);

      long longitude = myGPS.getLongitude();
      Serial.print(F(" Long: "));
      Serial.print(longitude);
      Serial.print(F(" (degrees * 10^-7)"));

      long altitude = myGPS.getAltitude();
      Serial.print(F(" Alt: "));
      Serial.print(altitude);
      Serial.print(F(" (mm)"));

      byte SIV = myGPS.getSIV();
      Serial.print(F(" SIV: "));
      Serial.print(SIV);
    
    
      Serial.println();
      */
      
    }

  
  }
}