// GSM Module (SIM900A) Example – Send SMS and Make Call using Arduino

#include 

// RX = 7, TX = 8 (connect to GSM module's TX and RX respectively)
SoftwareSerial gsm(7, 8);

void setup() {
  // Start communication with GSM module and Serial Monitor
  gsm.begin(9600);
  Serial.begin(9600);
  
  Serial.println("Initializing GSM Module...");
  delay(3000); // Allow GSM module to boot up

  // Check GSM communication
  gsm.println("AT"); 
  delay(1000);

  // Set SMS to Text Mode
  gsm.println("AT+CMGF=1"); 
  delay(1000);

  // Send SMS to phone number (change to real number with country code)
  gsm.println("AT+CMGS=\"+919XXXXXXXXX\""); 
  delay(1000);
  gsm.print("Hello from YSEF IoT Project! This is a test SMS.");
  delay(1000);
  gsm.write(26); // ASCII code for Ctrl+Z
  delay(3000); // Wait for message to send
  Serial.println("SMS sent successfully!");

  // Now make a phone call
  gsm.println("ATD+919XXXXXXXXX;"); // Replace with your number
  Serial.println("Dialing the number...");
  delay(10000); // Ring for 10 seconds

  // Hang up the call
  gsm.println("ATH");
  Serial.println("Call ended.");
}

void loop() {
  // No actions in loop
}