DVR/NVR ALARM NOTIFICATION SEND VIA TEXT MESSAGE [SMS]

How to receive sms text message when CCTV camera system detects Intruder activity. 

CCTV Camera system send SMS Message notification using Arduino and Sim800L GSM Module

Arduino Uno : https://amzn.to/310xVCa 

SIM800L GPRS GSM Module : https://amzn.to/3HgLvB6 

LM2596 DC to DC Buck Converter : https://amzn.to/3quyzRi 

DC 5V 2Amp Power Supply : https://amzn.to/32nb1Wz

#include <SoftwareSerial.h>

SoftwareSerial mySerial(2, 3);                     // RX,TX for Arduino and for the module it's TXD RXD, they should be inverted


const int buttonPin = 7;                          // the number of the pushbutton pin
int buttonState = 0;                              // variable for reading the pushbutton status

int state = 0;


void setup()
{
 

  mySerial.begin(9600);                          //Module baude rate, this is on max, it depends on the version
  Serial.begin(9600);   
  Serial.println("Initializing...");
  delay(1000);

  mySerial.println("AT");                 // Sends an ATTENTION command, reply should be OK
  Serial.println("AT");                 // Sends an ATTENTION command, reply should be OK
  mySerial.println("AT+CMGF=1");          // Configuration for sending SMS
  Serial.println("AT+CMGF=1");
  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
  }
  
}
 
void loop()
{
  pinMode(buttonPin, INPUT);
  buttonState = digitalRead(buttonPin);
  delay(1000);                                    // Delay time to Arm the SMS
  if (buttonState == HIGH && state == 0) { 
  SendSMS();
  delay(60000);                                   // Delay time for next SMS
 }
 
 if (buttonState == LOW && state == 1) {
    state = 0;
  }


}
 
void SendSMS()
{

  Serial.println("Sending SMS...");               //Show this message on serial monitor
  mySerial.print("AT+CMGF=1\r");                   //Set the module to SMS mode
  delay(100);
  mySerial.print("AT+CMGS=\"+917598111110\"\r");  //Your phone number don't forget to include your country code, example +917598111110"
  delay(500);
  mySerial.print("CCTV ALARM");                //This is the text to send to the phone number, don't make it too long or you have to modify the SoftwareSerial buffer
  delay(500);
  mySerial.print((char)26);                       // (required according to the datasheet)
  delay(500);
  mySerial.println();
  Serial.println("Text Sent.");
  delay(1000);
  state = 1;
}