Notification IoT Using NeoPixel and Smartphone

#include <SoftwareSerial.h>
#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h>
#endif
#define PIN            10
#define NUMPIXELS      24

#define rxPin 4
#define txPin 3

SoftwareSerial BT(txPin, rxPin);
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

int delayval = 50; // delay for half a second

void setup() {
  BT.begin(9600);
  Serial.begin(9600);
  pixels.begin(); // This initializes the NeoPixel library.
}

void loop() {
  
  if (BT.available() >0)
  {

    //Receive values from Notiduino Android App whenever it gets notification messages
    //Use semicolon and comma as seperator to retrieve header message and RGB color value
    String BT_receive_data = BT.readStringUntil((char)3);
    String Message_Head = getValue(BT_receive_data, ';', 0);
    String ColorValue = getValue(BT_receive_data, ';', 1);
    int R = getValue(ColorValue, ',', 0).toInt();
    int G = getValue(ColorValue, ',', 1).toInt();
    int B = getValue(ColorValue, ',', 2).toInt();

    Serial.println(Message_Head);
    Serial.println(ColorValue);

      for (int i = 0; i<NUMPIXELS; i++)
      {
        pixels.setPixelColor(i, pixels.Color(R, G, B)); // Moderately bright green color.
        pixels.show(); // This sends the updated pixel color to the hardware.
        delay(10);
        pixels.setPixelColor(i, pixels.Color(0, 0, 0));
      }
  }
  
}

#pragma region get Value
String getValue(String data, char separator, int index)
{
  int found = 0;
  int strIndex[] = { 0, -1 };
  int maxIndex = data.length() - 1;

  for (int i = 0; i <= maxIndex && found <= index; i++){
    if (data.charAt(i) == separator || i == maxIndex){
      found++;
      strIndex[0] = strIndex[1] + 1;
      strIndex[1] = (i == maxIndex) ? i + 1 : i;
    }
  }

  return found > index ? data.substring(strIndex[0], strIndex[1]) : "";
}
#pragma endregion