SIM800L GPRS Module with SMS Activated Devices

#include <SoftwareSerial.h>
#include <Sim800l_EM.h>
Sim800l Sim800l;
unsigned long bauds = 9600;



String SMScontain; // SMS contain only
String SMSsender; // SMS sender's Name
String text; // Detail SMS 
String ReadTXT ="Test" ;
int NUMSMS; //SMS storage
long MSGlen;
uint8_t SMS_QTY;
String dt;
uint8_t index=1;
bool error;
String ReadMsg;
int LEDPIN = 12;






void setup(){
  Serial.begin(bauds);  
  pinMode(LEDPIN,OUTPUT);
  Sim800l.begin(); 
  delay(5000);
  Serial.print("Ready to Work");
}


void loop(){
//-------------------------------------------------------------
// Get SMS storage amount -------------------------------------
//-------------------------------------------------------------
Sim800l.AT();
delay(500);

int NUMSMS = Sim800l.getCountsms();

if (NUMSMS !=0 ){

//-------------------------------------------------------------
  
  SMScontain = Sim800l.readMSG(index); // Filter SMS contain
  SMScontain.trim();
  text = SMScontain;
  delay(1000);
  ReadTXT = text;
//-----------------------------------------------
 //===============================================
   if (text.length() > 0){ // GET SENDER NUMBER 
 //===============================================

    SMSsender = Sim800l.getNumberSms(index);
    SMSsender =SMSsender.substring(0,12);
    SMSsender.trim();
    //Serial.println(SMSsender.length() );
    Serial.println(text);
    Sim800l.delAllSms();
 //  SMSsender = "+12345678910" // If you want to get fead back to a perticular number
//-----------------------------------------------
// FILTER MSG CONTAIN----------------------------
//-----------------------------------------------  

if (SMScontain.length() > 0){
//Serial.print("SMSsender: ");
//Serial.println(SMSsender);
Serial.print("SMS : ");
Serial.println(SMScontain);
}
//----------------------------------------------

}  //===============================================

} // END ------------------------------------>


//*************************************************
//ON OFF by SMS ----------------------------------
//*************************************************

if (SMScontain == "ON"){
digitalWrite(LEDPIN,HIGH);
error=Sim800l.sendSms(SMSsender,"Switch ON"); // Active if you want a feadback
delay(500);}
else if (SMScontain == "OFF"){
digitalWrite(LEDPIN,LOW);
error=Sim800l.sendSms(SMSsender,"Switch OFF"); // Active if you want a feadback
delay(500);}
//*************************************************


//Clear Data
SMSsender ="";
SMScontain=""; 
text="";


} //END Void Loop