#include <SoftwareSerial.h> 
String inWord;
char inByte;
String data;
SoftwareSerial GPS_Serial(10, 11); // RX, TX 11 is not connected
SoftwareSerial mySerial(3, 2); // Rx & Tx is connected to SIM module Tx and Rx
#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BMP085_U.h>
Adafruit_BMP085_Unified bmp = Adafruit_BMP085_Unified(10085);
float seaLevelPressure = SENSORS_PRESSURE_SEALEVELHPA;

void setup() {
  // Start the GPS module

 Serial.begin(9600);
  Serial.println("Pressure Sensor Test"); Serial.println("");
  
  /* Initialise the sensor */
 if(!bmp.begin())
  {
    /* There was a problem detecting the BMP085 ... check your connections */
    Serial.print("Ooops, no BMP085 detected ... Check your wiring or I2C ADDR!");
    while(1);
  }
    GPS_Serial.begin(9600); 

}

void loop() {
  sensors_event_t event;
  
    /* Calculating altitude with reasonable accuracy requires pressure    *
     * sea level pressure for your position at the moment the data is     *
     * converted, as well as the ambient temperature in degress           *
     * celcius.  If you don't have these values, a 'generic' value of     *
     * 1013.25 hPa can be used (defined as SENSORS_PRESSURE_SEALEVELHPA   *
     * in sensors.h), but this isn't ideal and will give variable         *
     * results from one day to the next.                                  *
     *                                                                    *
     * You can usually find the current SLP value by looking at weather   *
     * websites or from environmental information centers near any major  *
     * airport.                                                           *
     * 
      */
    if(bmp.pressureToAltitude(seaLevelPressure, event.pressure) >= 1){  // number 1 here is just a value used for test, but this should be chnaged with the maximum height the drone can fly to.
Serial.println("Intruder");
      delay(500);
 
  while (GPS_Serial.available() > 0) {
        inByte = GPS_Serial.read();
        
        if (inByte == '\n') {
            // END OF LINE
            
            // check is data we want
            // you can change this to get any data line values
            if (inWord.startsWith("$GPRMC")) {
                // put data string in variable
                data = inWord;
                  Serial.println(data);
mySerial.begin(9600);               
Serial.println("Initializing..."); 
delay(1000);
mySerial.println("AT"); //Handshaking with SIM900
mySerial.println("AT+CMGF=1"); // Configuring TEXT mode
updateSerial();
mySerial.println("AT+CMGS=\"+ZZxxxxxxxxxxx\"");//change ZZ with country code and xxxxxxxxxxx with phone number to sms
updateSerial();
mySerial.print("unauthorized drone flight detected at:");
mySerial.print(data); //text content
updateSerial();
mySerial.write(char(26));
    

                // clear the inword variable
                inWord = "";
            } else {
                // clear the inword variable as not the data we want
                inWord = "";
            }
            
        } else {
            // build data string
            inWord += inByte;   
        }
        
    } // end if serial
   
    }
    else{
    Serial.println("good"); 

    
    }
    
      delay(500);

    }

    
void updateSerial()
{
  delay(500);
  while (Serial.available()) 
  {
    mySerial.write(Serial.read());//Forward what Serial received to Software Serial Port
  }
  while(mySerial.available()) 
  {
    Serial.write(mySerial.read());//Forward what Software Serial received to Serial Port
  }
}