GSM sim900 aGPS explain

GSM sim808 GSM / GPS /GPRS show real location using AT command.

https://simcom.ee/modules/gsm-gprs-gnss/sim808/

Code

#include <SoftwareSerial.h>

SoftwareSerial sim808(7,8);

char phone_no[] = "084xxxxxx"; // replace with your phone no.

String data[5];

#define DEBUG true

String state,timegps,latitude,longitude;

void setup() {

 sim808.begin(9600);

 Serial.begin(9600);

 delay(50);

 sim808.print("AT+CSMP=17,167,0,0");  // set this parameter if empty SMS received

 delay(100);

 sim808.print("AT+CMGF=1\r"); 

 delay(400);

 sendData("AT+CGNSPWR=1",1000,DEBUG);

 delay(50);

 sendData("AT+CGNSSEQ=RMC",1000,DEBUG);

 delay(150);

}

void loop() {

  sendTabData("AT+CGNSINF",1000,DEBUG);

  if (state !=0) {

    Serial.println("State  :"+state);

    Serial.println("Time  :"+timegps);

    Serial.println("Latitude  :"+latitude);

    Serial.println("Longitude  :"+longitude);

    sim808.print("AT+CMGS=\"");

    sim808.print(phone_no);

    sim808.println("\"");

    

    delay(300);

    sim808.print("http://maps.google.com/maps?q=loc:");

    sim808.print(latitude);

    sim808.print(",");

    sim808.print (longitude);

    delay(200);

    sim808.println((char)26); // End AT command with a ^Z, ASCII code 26

    delay(200);

    sim808.println();

    delay(20000);

    sim808.flush();

    

  } else {

    Serial.println("GPS Initialising...");

  }

}

void sendTabData(String command , const int timeout , boolean debug){

  sim808.println(command);

  long int time = millis();

  int i = 0;

  while((time+timeout) > millis()){

    while(sim808.available()){

      char c = sim808.read();

      if (c != ',') {

         data[i] +=c;

         delay(100);

      } else {

        i++;  

      }

      if (i == 5) {

        delay(100);

        goto exitL;

      }

    }

  }exitL:

  if (debug) {

    state = data[1];

    timegps = data[2];

    latitude = data[3];

    longitude =data[4];  

  }

}

String sendData (String command , const int timeout ,boolean debug){

  String response = "";

  sim808.println(command);

  long int time = millis();

  int i = 0;

  while ( (time+timeout ) > millis()){

    while (sim808.available()){

      char c = sim808.read();

      response +=c;

    }

  }

  if (debug) {

     Serial.print(response);

     }

     return response;

}

GSM sim900A alert flooding show location :