Reading data received from Nextion on Serial Monitor

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Fritz1
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Code on the Arduino to Serial Monitor

int LED = 5;                                //Define the pin for the LED

void setup() {
  Serial.begin(9600);                       //The default baud rate of the Nextion TFT is 9600.            
  pinMode(LED,OUTPUT);                      //Define pin as OUTPUT

}

void loop() {
  if(Serial.available()>0)                  //If we receive something...
  {
    String Received = Serial.readString();  //Save the received String in the Received variable
    if(int(Received[0]) == 234)               //If the first character of "Received" is "1"
    {
      digitalWrite(LED,HIGH);               //We turn on the LED
    }
    if(int(Received[0]) == 12)               //if is a "0"
    {
      digitalWrite(LED,LOW);                //We turn the LED off
    }
  }

}

Code on the Arduino to Nextion

const uint8_t bufferSize = 128;
char NextionDataRx[bufferSize];
uint8_t NextionDataIndex = 0;
bool dataReady = false;
bool overflow = false;

uint16_t baudNextion = 9600;  // Change this to match whatever board rate you are using for the Nextion.

void setup() {
  char fileName[] = __FILE__;
  Serial.begin(9600);  //   ................Had to change this to see an output
  delay(2000);
  Serial.println("Serial monitor started");
  Serial1.begin(baudNextion);
  Serial.println("Serial 1 started");
  Serial.println(" ");
  Serial.println(sizeof(fileName));
  Serial.println(fileName);  
}

void loop() {
  RxNextionData();
  PrintNextionData();
}

void RxNextionData() {
  char RxTemp;
  static uint8_t charCount;
  static uint8_t ffCount;
  while (Serial1.available() > 0) {
    RxTemp = Serial1.read();
    if (RxTemp == 0xff) {
      ++ffCount;
      if (ffCount >= 3) {
        dataReady = true;
        ffCount = 0;
        NextionDataRx[NextionDataIndex] = 0;
        NextionDataIndex = 0;
      }
    } else {
      NextionDataRx[NextionDataIndex] = RxTemp;
      ++NextionDataIndex;
      if (NextionDataIndex >= bufferSize) {
        NextionDataRx[bufferSize - 1] = 0;
        dataReady = true;
        overflow = true;
      }
    }
  }
}

void PrintNextionData() {
  if (dataReady) {
    dataReady = false;
    if (overflow) {
      overflow = false;
      Serial.print("Buffer overflow: ");
    }
    Serial.println(NextionDataRx);
  }
}