gistfile1.ino

int led = 13;
int incomingByte = 0;

// the setup routine runs once when you press reset:
void setup() {
  // initialize serial communication at 9600 bits per second:
  Serial.begin(9600);
  pinMode(led, OUTPUT);     
}

// the loop routine runs over and over again forever:
void loop() {
  Serial.print("#TXT|TXT|TEXT$");
  delay(5000);        // delay in between reads for stability
  
  if (Serial.available()) { 
    char buffer[256];
    memset(buffer,0,sizeof(buffer));
    
    int count = Serial.readBytesUntil('$', buffer, 256);
    
    if (count == 0) {
      Serial.print("#");
      Serial.print("NAO|LI|NADA");
      Serial.print("$");
    } else {
      Serial.print("#");
      Serial.print(buffer);
      Serial.print("$");
    }      
  }
}