// Program for esp32 as bluetooth buffer
// created by Jans Hendry
// Universitas Gadjah Mada, Indonesia
// Kamakura Node, Japan
// fab academy MIT - 2022

// directive bluetooth serial
#include "BluetoothSerial.h"
BluetoothSerial SerialBT; // create an object

char sign; // received char

// variables
const int sigToat = 4; // send signal to attiny3216 (digital pin)
char von = 'on';
char voff = 'off';

void setup() {
  Serial.begin(115200); // start serial esp32
  SerialBT.begin("ESP32 - Jans"); //Bluetooth device name

  // set pin as output
  pinMode(sigToat, OUTPUT);
  digitalWrite(sigToat, LOW);

  delay(500); // take a breath
}

void loop() {
  
  // tells esp32 that pairing is success
  if (Serial.available()) {
    SerialBT.write(Serial.read());
  }

  // check whether serial bluetooth is also available
  if (SerialBT.available()) {
    sign = (char)SerialBT.read();
    
    SerialBT.print("Received:");// write on BT app
    SerialBT.println(sign);// write on BT app      
    Serial.print ("Received:");//print on serial monitor
    Serial.println(sign);//print on serial monitor  
    delay(10);  
    
    if(sign == von)
    {
     Serial.println("LED is ON:");//write on serial monitor
     digitalWrite(sigToat, HIGH);// turn the LED ON 
     delay(20);
    }
    if(sign == voff)
    {
     Serial.println("LED is OFF:");//write on serial monitor
     digitalWrite(sigToat, LOW);// turn the LED off
     delay(20); 
    }    
  }
  delay(100);
}