CL3VERTRONICS/GSM Wireless switching.ino at master · NavadeepGaneshU/CL3VERTRONICS · GitHub

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String inputString = "";
boolean stringComplete = false;
String incomingString ="";
int startIndex = 0;
int endIndex = 0;
int led1 = 4;

void setup() {
            StringComplete = true;
             }
Serial.begin(9600);

pinMode(led1, OUTPUT);

   digitalWrite(led1, LOW);


  inputString.reserve(200);

  Serial.print("AT+CMGF=1\r");

  delay(1000);
  //Serial.print("AT+CMGD=1,4\r");  // Deletes all SMS saved in SIM memory

  Serial.print("AT+CMGDA=\"");

  Serial.println("DEL ALL\"");
 delay(1000);

  Serial.print("AT+CMGS=\"+xx xxxxxxxxxx\"\r");    //Number to which you want to send the sms

  delay(1000);
  Serial.print("Test SMS - It Started Working1..\r");   //The text of the message to be sent

  delay(1000);

  Serial.write(0x1A);

  delay(1000);

  Serial.print("AT+CNMI=2,2,0,0,0\r");

  delay(1000);

  //--End: SMS--

}
void loop() {

  // print the string when a newline arrives:

  if (stringComplete && inputString!="") {

    //Serial.print("AT+CMGL=ALL\r");

    inputString.toLowerCase();
    if(inputString=="@light on#")

    {
      digitalWrite(led1, HIGH);

    }
    else if(inputString=="@light off#")

    {
      digitalWrite(led1, LOW);

    }

   Serial.print("AT+CMGDA=\"");

   Serial.println("DEL ALL\""); // To Delete Messages from SIM Memory

   delay(1000);

   inputString = "";

   stringComplete = false;

  }

}
void serialEvent()

{
  if(stringComplete == false)

   {
        incomingString = Serial.readString();

        if(incomingString!="")

        {

          startIndex = incomingString.indexOf("@");

          endIndex = incomingString.indexOf("#");
     if(startIndex>0 && endIndex>0)

          {

   inputString =incomingString.substring(startIndex,endIndex+1);
   }
   }
}