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#include <HardwareSerial.h>

// Initialize HardwareSerial for Serial2 (RX2, TX2)
HardwareSerial sim800(2);  // Use Serial2

void setup() {
  Serial.begin(115200);                    // Serial monitor communication
  sim800.begin(9600, SERIAL_8N1, 16, 17);  // RX2 (GPIO16), TX2 (GPIO17)

  delay(2000);  // Wait for the SIM800L to initialize

  Serial.println("Testing SIM800L...");

  // Send AT command to SIM800L and check if it responds
  sim800.println("AT");
  delay(1000);  // Wait for response

  // Check if SIM800L sends a response
  while (sim800.available()) {
    char c = sim800.read();
    Serial.write(c);  // Print response to Serial Monitor
  }

  // Check if SIM800L is registered to the network
  sim800.println("AT+CREG?");
  delay(1000);  // Wait for response

  while (sim800.available()) {
    char c = sim800.read();
    Serial.write(c);  // Print network registration status to Serial Monitor
  }



  // Send a test SMS
  sim800.println("AT+CMGF=1");  // Set SMS text mode
  delay(1000);
  sim800.println("AT+CMGS=\"+880 1977351352\"");  // Replace with your phone number
  delay(1000);
  sim800.print("Hello, this is a test message from SIM800L!");  // Message content
  delay(1000);
  sim800.write(26);  // Send Ctrl+Z to send SMS
  Serial.println("Message Sent !");
}

void loop() {
  // Nothing to do in loop
}