Sim800L_Read_Message.ino

#include <SoftwareSerial.h>
SoftwareSerial sim(10, 11);

void setup() {
 
  Serial.begin(9600);
  Serial.println("System Starting...");
  sim.begin(9600);
  delay(1000);
  Serial.println("Initializing SIM800L Module...");
  delay(1500);
  listenIncomingMessage();
}

void loop() {
  
  if (Serial.available() > 0){
        Serial.read();
  }

    
  if (sim.available() > 0){

    String sms = sim.readString();

    String sender_number = sms.substring(9,22);
    
    String message_content = sms.substring(49,sms.length());
    
    Serial.write(sim.read());
    
        if(sms.indexOf("+CMT") > 0){

              Serial.print("\n \n" + message_content);

        }
  }
    
}

 
void listenIncomingMessage()
{
  Serial.println ("Wating For New Messages....");
  sim.println("AT+CMGF=1");
  delay (200);
  sim.println("AT+CNMI=1,2,0,0,0");
  delay(200);
  Serial.write (".....");
}