Bluetooth smart led

1#include <SoftwareSerial.h>
2SoftwareSerial HM10(8, 9); // RX = 8, TX  = 9
3char appData;  
4String inData = "";
5void setup()
6{
7  Serial.begin(9600);
8  Serial.println("HM10 serial started at 9600");
9  HM10.begin(9600); // set  HM10 serial at 9600 baud rate
10  pinMode(13, OUTPUT); // onboard LED
11  digitalWrite(13,  LOW); // switch OFF LED
12
13}
14
15void loop()
16{
17  HM10.listen();  //  listen the HM10 port
18  while (HM10.available() > 0) {   // if HM10 sends something  then read
19    appData = HM10.read();
20    inData = String(appData);  // save  the data in string format
21    Serial.write(appData);
22  }
23
24 
25  if  (Serial.available()) {           // Read user input if available.
26    delay(10);
27    HM10.write(Serial.read());
28  }
29  if ( inData == "F") {
30    Serial.println("LED  OFF");
31    digitalWrite(13, LOW); // switch OFF LED
32    delay(500);
33  }
34  if ( inData == "N") {
35    Serial.println("LED ON");
36    digitalWrite(13,  HIGH); // switch OFF LED
37    delay(500);
38    digitalWrite(13, LOW); // switch  OFF LED
39    delay(500);
40  }
41}