SmartBox/Firmware at master · Intelectron/SmartBox · GitHub

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//Created by Intelectron India, 2017
// FREE TO EDIT AND MODIFY
#include <SoftwareSerial.h>

#define FAN   1
#define LIGHT  2

int fanPin = 11;
int lightPin = 10;

int FANstate = 0;
int LIGHTstate = 0;

SoftwareSerial BT(9,8);

//comment the following line to disable debugging mode
#define __DEBUG_

String codes[] = {"", "FAN", "LIGHT"};
void setup() {

#ifdef __DEBUG_
  Serial.begin(115200);
#endif

  BT.begin(115200);
#ifdef __DEBUG_
  Serial.println("DEBUG mode ON");
#endif
  pinMode(fanPin, OUTPUT);
  pinMode(lightPin, OUTPUT);

}

void loop() {
  if (BT.available()) {
    processSerial();
  }
}
void processSerial() {
  char _temp[20] = {};
  int code = -1;
  BT.readBytesUntil('#', _temp, 20);
  String buffer = String(_temp);
  //check which code was sent
  switch (buffer[0]) {
    case '$':
      code = FAN;
      break;
    case '@':
      code = LIGHT;
      break;
  }
  buffer.remove(0, 1); //removes the identifier
  processSerialData(buffer, code);
#ifdef __DEBUG_
  Serial.println(codes[code]);
#endif
  Serial.flush();
}
void processSerialData(String buffer, int code) {
  switch (code) {
    case FAN:
      processFAN(buffer);
      break;
    case LIGHT:
      processLIGHT(buffer);
      break;
  }
}
void processFAN(String buffer) {
  char state = buffer[0];
  if (state == '1') {
    buffer.remove(0, 2);
    FANstate = 1;
    //TURN ON FAN

#ifdef __DEBUG_
    Serial.println("FAN turned ON");

#endif
    digitalWrite(fanPin, HIGH);
  }
  else if (state == '0') {
    //turn off FAN
    FANstate = 0;
    digitalWrite(fanPin, LOW);
#ifdef __DEBUG_
    Serial.println("FAN turned OFF");
#endif
  }
}
void processLIGHT(String buffer) {
  char state = buffer[0];
  if (state == '1') {
    //turn on LIGHT
    LIGHTstate = 1;
#ifdef __DEBUG_
    Serial.println("LIGHT turned ON");
#endif
    digitalWrite(lightPin, HIGH);
  }
  else if (state == '0') {
    //turn off LIGHT
    LIGHTstate = 0;
#ifdef __DEBUG_
    Serial.println("LIGHT turned OFF");
#endif
    digitalWrite(lightPin, LOW);
  }
}