#include <SoftwareSerial.h>

unsigned char buffer[64]; // buffer array for data recieve over serial port
int count = 0;   // counter for buffer array
const int tagLength = 13;


const char matchingTag[] = "010F5E146F+";


void setup()
{
  Serial.begin(9600);             // the Serial port of Arduino baud rate.
  Serial.println("RFID module started in Auto Read Mode, Waiting for Card...");
  clearBuffer();
}

void loop()
{

  if (ChecForTag())
  {

    if (strcmp(buffer, matchingTag)==0)
    {
      Serial.println("Tag Matched");
      Serial.write(buffer,count);
      Serial.println();
    } else { Serial.println("Tag Not Matched");
      Serial.write(buffer,count);
      Serial.println();
    }
    //clear buff
    clearBuffer();
    //reset count
    count = 0;
  }

}

// function to clear buffer array
void clearBuffer()
{
  for (int i = 0; i < count; i++)
  {
    buffer[i] = NULL;
  }                  // clear all index of array with command NULL
}

bool ChecForTag()
{
  bool haveTag = false;
  //is there a byte
  if (Serial.available())
  { //while there is a byte
    while (Serial.available())
    { //read a byte
      char c = Serial.read();
      // SOT, EOT, NL don't include
      if (c != 2 && c != 3 && c != 10)
      { //save byte to butter, increase count
        if (count < sizeof(buffer)) {
          buffer[count] = c;
          count++;
        }
      } else { //EOT recvd, we have a tag
        if (c == 3) haveTag = true; //EOT -end of text
        if (c == 10) haveTag = true; //NL - also trigger here in case no EOT, for sim
      }
    }
  }
  return haveTag;
}