Sending location using sim800l, GY-NEO6MV2 GPS and Arduino MEGA

Hello,

I'm working on a project where i want to know the location of the device. I implemented this logic where when i put the digital pin 30 to GND it would call the function for GPS. I tried this code inside where the GPS isn't available and it's working, it sends the data from the GSM, and pin30 was connected constant to GND. Is this logic good, i didn't tested outside, where i should have the location from the GPS module. Can you tell me if it's good, if i missed something.

Basically at this project i want to know the location from the GPS and if i am inside i want to know the location from the GSM and sends this data to a number using GSM.

The code is :

#include <TinyGPS++.h>

// The TinyGPS++ object
TinyGPSPlus gps;

#define GPS_INTERRUPT_PIN 30


String Link = "The current Location is https://www.google.com/maps/place/"; //we will append the Lattitude and longitude value later int the program 

String responce = "";

String Longitude = "";

String Latitude = ""; 

String Date ="";

String Time ="";

String result2 = "";

volatile bool gpsDataAvailable = false;

String SIM800_send(String incoming) //Function to communicate with SIM800 module 

{
    Serial1.println(incoming); delay(100); //Print what is being sent to GSM module 

    String result = "";

    while (Serial1.available()) //Wait for result 
    {
    char letter = Serial1.read();
    result = result + String(letter); //combine char to string to get result 
    }

return result; //return the result 
}

// Funcție pentru tratarea datelor GPS disponibile
void handleGPSData()
{
  while (Serial2.available() > 0) {
    gps.encode(Serial2.read());
  }
  // Setează flag-ul pentru a indica că datele GPS sunt disponibile
  gpsDataAvailable = true;
}



void setup() {

  Serial.begin(9600);
  Serial2.begin(9600); //Serial COM for debugging
  Serial1.begin(9600);

  pinMode(GPS_INTERRUPT_PIN, INPUT_PULLUP); // Configurează pinul de întrerupere ca intrare cu rezistență pull-up

  attachInterrupt(digitalPinToInterrupt(GPS_INTERRUPT_PIN), handleGPSData, LOW);
  
  delay(1000); //wait for serial COM to get ready 


  responce = SIM800_send("ATE1"); //Enable Echo if not enabled by default 

  Serial.print ("Responce:"); Serial.println(responce); 

  delay(1000);


  responce = SIM800_send("AT+CGATT=1"); //Set the SIM800 in GPRS mode 

  Serial.print ("Responce:"); Serial.println(responce); 

  delay(1000);


  responce = SIM800_send("AT+SAPBR=3,1,\"CONTYPE\",\"GPRS\" "); //Activate Bearer profile 

  Serial.print ("Responce:"); Serial.println(responce); 

  delay(1000);


  responce = SIM800_send("AT+SAPBR=3,1,\"APN\",\"net\""); //Set VPN options => 'RCMNET' 'www'

  Serial.print ("Responce:"); Serial.println(responce); 

  delay(2000);

  responce = SIM800_send("AT+SAPBR=1,1"); //Open bearer Profile

  Serial.print ("Responce:"); Serial.println(responce); //Open bearer Profile 

  delay(2000);


  responce = SIM800_send("AT+SAPBR=2,1"); //Get the IP address of the bearer profile 

  Serial.print ("Responce:"); Serial.println(responce); 

  delay(1000);

}



void prepare_message()

{
  //Sample Output for AT+CLBS=1,1 
  
  int first_comma = responce.indexOf(','); //Find the position of 1st comma 

  int second_comma = responce.indexOf(',', first_comma+1); //Find the position of 2nd comma 

  int third_comma = responce.indexOf(',', second_comma+1); //Find the position of 3rd comma 


  for(int i=first_comma+1; i<second_comma; i++) //Values form 1st comma to 2nd comma is Longitude 

    Longitude = Longitude + responce.charAt(i); 


  for(int i=second_comma+1; i<third_comma; i++) //Values form 2nd comma to 3rd comma is Latitude 

    Latitude = Latitude + responce.charAt(i); 


  Serial.println(Latitude); Serial.println(Longitude); 

  Link = Link + Latitude + "," + Longitude; //Update the Link with latitude and Logitude values 

  Serial.println(Link);

}


String incoming = "";


void loop() {
   
    if (gpsDataAvailable) 
    {
    delay (1000);
    gps.encode(Serial2.read());
    if (gps.location.isUpdated())
    {
      // Latitude in degrees (double)
      Serial.print("Latitude= "); 
      Serial.print(gps.location.lat(), 6);
      Latitude = String(gps.location.lat(), 6);; 
            
      // Longitude in degrees (double)
      Serial.print(" Longitude= ");
      Serial.println(gps.location.lng(), 6);
      Longitude = String(gps.location.lng(), 6);
      
      Link = Link + Latitude + "," + Longitude; 
       
      // Raw date in DDMMYY format (u32)
      Serial.print("Raw date DDMMYY = ");
      Serial.println(gps.date.value());

      Date = gps.date.value();
      
      // Raw time in HHMMSSCC format (u32)
      Serial.print("Raw time in HHMMSSCC = "); 
      Serial.println(gps.time.value());
      
      Time = gps.time.value();
      
      gpsDataAvailable = false;  
  }
  }
  else
  {
    if (Serial1.available()) 
    { //Check if the SIM800 Module is telling anything 
      
      char a = Serial1.read();
  
      Serial.write(a); //print what the module tells on serial monitor 
  
      incoming = incoming + String(a);
  
      if (a == 13) //check for new line 
      incoming =""; //clear the string if new line is detected 
  
      incoming.trim(); //Remove /n or /r from the incomind data 
  
      
      if (incoming=="RING") //If an incoming call is detected the SIM800 module will say "RING" check for it 
      {
       Serial.println ("Sending sms"); delay(1000);
  
       responce = SIM800_send("ATH"); //Hand up the incoming call using ATH
       delay (1000);
  
       responce = SIM800_send("ATE0"); //Disable Echo
       delay (1000);
  
       responce = "";
       if ( (Latitude=="") && (Longitude=="") )
       {
        Serial1.println("AT+CLBS=1,1"); delay(5000); //Request for location data 
        while (Serial1.available()) 
        {
         char letter = Serial1.read();
         responce = responce + String(letter); //Store the location information in string responce 
        }
        
        Serial.print("Result Obtained as:");   Serial.print(responce); Serial.println("*******");
        prepare_message(); delay(1000); //use prepare_message funtion to prepare the link with the obtained LAT and LONG co-ordinates 
       }
        
       Serial1.println("AT+CMGF=1"); //Set the module in SMS mode
       delay(1000);
  
       Serial1.println("AT+CMGS=\"+40753159104\""); //Send SMS to this number 
       delay(1000);
  
       Serial1.println(Link); // we have send the string in variable Link 
       delay(1000);
  
       Serial1.println((char)26);// ASCII code of CTRL+Z - used to terminate the text message 
       delay(1000);
      }
    }
  }
}

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