#include "TinyGPS++.h";

#define GPS_RX_PIN 16
#define GPS_TX_PIN 17

TinyGPSPlus gps;

/* LAT = latitude
LON = longitude
ALT = altitude
Note: all 32-bit flaoting point decimal operations ARE atomic for the ESP32.
This means that sharing data across threads and cores IS SAFE!
So launching the web server on a separate thread will ot cause a data race */ 
float LAT, LON, ALT;

void setup() {
  /*
  Serial speed of USB.
  NOTE:  this model of ESP has a native baud rate of 115200, meaning that boot message will display properly along with all other serial output
  */
  Serial.begin(115200); 
  // Serial speed of GPS module
  Serial2.begin(9600, SERIAL_8N1, GPS_RX_PIN, GPS_TX_PIN);
  Serial.println("Setup complete!");
}

void loop() {
  // if there is anything to read from serial port 2
  while (Serial2.available()) {
    // read one character into the char "in"
    char in = Serial2.read();
    //Serial.print(in);
    // send to GPS encoder to create new data
    gps.encode(in);
    // if a new location is given
    if (gps.location.isUpdated()) {
      // set all location attributes we desire
      LAT = gps.location.lat();
      LON = gps.location.lng();
      ALT = gps.altitude.meters();
      Serial.print("LAT=");
      Serial.print(LAT, 6);
      Serial.print(" LON=");
      Serial.print(LON, 6);
      Serial.print(" ALT=");
      Serial.println(ALT, 6);
    } // close if
  } // close while
} // close loop