GSM / SMS Module basic functions (Text , Receive) HARDWARE S

char msg;
char incomingByte;
String inputString;
const String number =  "9275156419"; // number na itetext ng gsm module



int smsCounter = 0;

void setup() {
  Serial.begin(115200);

  Serial3.begin(115200);
   SendSMS(number, "Hi ");
    ReceiveMessage(); // Function para makarecieve ng sms



}

void loop() {
  // put your main code here, to run repeatedly:


//ReceiveMessage();
 if (Serial3.available()){
    delay(100); // ito yung condition kung may buffered data sa gsm module
    while(Serial3.available()){
      incomingByte = Serial3.read();// babasahin yung data at ilalagay sa inputString
      inputString += incomingByte;
    }
    delay(10);
    Serial.println(inputString);
    inputString.toUpperCase();

    if (inputString.indexOf("STATUS") > -1 && smsCounter == 0){ // ito naman hahanap ng word na STATUS sa text ng user at kapag meron magsesend ng msg
      Serial.println("Received text from trusted number.");
      SendSMS(number, "I am GSM Module: ");

      Serial3.println("AT+CMGF=1");
      delay(1000);
      Serial3.print("AT+CMGS=\"+63");
      Serial3.print(number);
      Serial3.print("\"\r");
      delay(1000);
      Serial3.print(".: \n");
      Serial3.print("asd");
      Serial3.print("\n");
      Serial3.print(".: \n");
      Serial3.print(".");
      delay(100);
      Serial3.print((char)26);
      delay(1000);
      smsCounter++;
    }
    inputString = "";

  }


}




void SendSMS(String number, String msg){ // Ito ung function na magsesend ng SMS
  Serial3.println("AT+CMGF=1");
  delay(1000);
  Serial3.print("AT+CMGS=\"+63");
  Serial3.print(number);
  Serial3.print("\"\r");
  delay(1000);
  Serial3.print(msg);
  delay(100);
  Serial3.print((char)26);
  delay(1000);
}

void DelSentSMS(){
  Serial3.print("AT+CMGDA=\"");
  Serial3.println("DEL SENT\"");
  delay(500);
  Serial.println( "All Sent Messages Deleted" );
}

void DelReadSMS(){
  Serial3.print("AT+CMGDA=\"");
  Serial3.println("DEL READ\"");
  delay(500);
  Serial.println( "All Read Messages Deleted" );
}

void ReceiveMessage(){
  Serial3.println("AT+CNMI=2,2,0,0,0 "); // AT Command to recieve a live SMS
  delay(1000);
}