#include <WiFi.h>

// GSM module pin definitions
#define GSM_TX 17
#define GSM_RX 16
#define GSM_RESET 5

SoftwareSerial GSM_serial(GSM_RX, GSM_TX); // RX, TX

void setup() {
  Serial.begin(115200);
  GSM_serial.begin(115200); // Correct baud rate
  Serial.println("GSM Test");

  // Initialize GSM modem
  while (!GSM_serial) {
    delay(10);
  }
  Serial.println("GSM Serial initialized");
}

void loop() {
  // Example: Send an SMS
  if (Serial.available()) {
    String command = Serial.readStringUntil('\n');
    Serial.println("Command received: " + command);
    if (command.equals("SMS")) {
      // Replace with your SMS message
      String message = "Hello from ESP32!";
      Serial.println("Sending SMS...");
      sendSMS(message, "555-1234"); // Replace with your recipient's number
      Serial.println("SMS sent!");
    }
  }
}

void sendSMS(const String& message, const String& number) {
  Serial.println("Sending AT commands...");
  GSM_serial.println("AT+CMGF=1"); // Set SMS message format to text
  delay(1000);
  GSM_serial.println("AT+CMGS=\"" + number + "\"");
  delay(1000);

  GSM_serial.print(message);
  GSM_serial.println((char)26); // Ctrl-Z to send the message
}