How to send GPS Coordinates over GSM

Code:-

#include <SoftwareSerial.h> //Software Serial header to communicate with GSM module

#include<LiquidCrystal.h>

LiquidCrystal lcd(13,12,11,10,9,8);



SoftwareSerial SIM800(2, 3); // RX, TX



String Link = "The current Location is https://www.google.com/maps/place/";

String responce = "";

String Longitude = "";

String Latitude = "";



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

{

    SIM800.println(incoming); delay(100); //Print what is being sent to GSM module

    String result = "";

    while (SIM800.available()) //Wait for result

    {

    char letter = SIM800.read();

    result = result + String(letter); //combine char to string to get result

    }

 

return result; //return the result

}



void setup() {



  lcd.begin(16,2);

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

  SIM800.begin(9600); //Software serial called SIM800 to speak with SIM800 Module

  lcd.print("Location Tracker");

  lcd.setCursor(0,1);

  lcd.print("  Without GPS   ");

  delay(3000);

  lcd.clear();

   lcd.print("Connecting with");

  lcd.setCursor(0,1);

  lcd.print("    GSM Modem   ");

  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\",\"RCMNET\" "); //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);

  lcd.clear();

   lcd.print("waiting for the");

  lcd.setCursor(0,1);

  lcd.print(" incoming call  ");

  delay(1000);

}



void prepare_message()

{

  //Sample Output for AT+CIPGSMLOC=1,1   ==> +CIPGSMLOC: 0,75.802460,26.848892,2019/04/23,08:32:35 //where 26.8488832 is Lattitude and 75.802460 is longitute

  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);

  lcd.setCursor(0,0);

  lcd.print("Lat: ");

  lcd.print(Latitude);

  lcd.setCursor(0,1);

  lcd.print("Lon: ");

  lcd.print(Longitude);

}



String incoming = "";



void loop() {



  if (SIM800.available()) { //Check if the SIM800 Module is telling anything

    char a = SIM800.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 = ""; Latitude=""; Longitude=""; //initialise all string to null

     SIM800.println("AT+CIPGSMLOC=1,1"); delay(5000); //Request for location data

      while (SIM800.available())

      {

       char letter = SIM800.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



     SIM800.println("AT+CMGF=1"); //Set the module in SMS mode

     delay(1000);

   

     SIM800.println("AT+CMGS=\"8825737586\""); //Send SMS to this number

     delay(1000);



     SIM800.println(Link); // we have send the string in variable Link

     delay(1000);



     SIM800.println((char)26);// ASCII code of CTRL+Z - used to terminate the text message

     delay(1000);

    }

  }



  if (Serial.available()) { //For debugging

    SIM800.write(Serial.read());

  }



}