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#include < HardwareSerial.h >
  HardwareSerial SIM800L(1);  // Use hardware serial port 1 for SIM800L
void setup() {
  Serial.begin(115200);     // Initialize serial communication for debugging
  SIM800L.begin(9600, SERIAL_8N1, 16, 17); // Initialize SIM800L at 9600 baud, using pins 16 (RX) and 17 (TX)
  delay(1000);              // Give the SIM800L module some time to initialize
  SIM800L.println("AT");    // Send "AT" to the module and it should respond with "OK"
}
void loop() {
  while (SIM800L.available()) {
    Serial.write(SIM800L.read());  // Display SIM800L module response on Serial Monitor
  }
  while (Serial.available()) {
    SIM800L.write(Serial.read());  // If any data is sent from Serial Monitor, send it to SIM800L module
  }
} 

Line: 1:12: Cannot find name 'HardwareSerial'.Line: 3:3: Cannot find name 'HardwareSerial'.Line: 3:18: Cannot find name 'SIM800L'.Line: 5:6: Cannot find name 'setup'.Line: 6:3: Cannot find name 'Serial'.Line: 7:3: Cannot find name 'SIM800L'.Line: 7:23: Cannot find name 'SERIAL_8N1'.Line: 9:3: Cannot find name 'delay'.Line: 11:3: Cannot find name 'SIM800L'.Line: 14:6: Cannot find name 'loop'.Line: 15:10: Cannot find name 'SIM800L'.Line: 16:5: Cannot find name 'Serial'.Line: 16:18: Cannot find name 'SIM800L'.Line: 19:10: Cannot find name 'Serial'.Line: 20:5: Cannot find name 'SIM800L'.Line: 20:19: Cannot find name 'Serial'.Line: 3:18: ';' expected.Line: 5:14: ';' expected.Line: 14:13: ';' expected.

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