master_slave_BT_Classic_button_led_switch

/**************************************************************************************************************************
                        Bluetooth Classic Button MASTER Sketch Uses the BOOT button
**************************************************************************************************************************/

// This example code is in the Public Domain (or CC0 licensed, at your option.)
// By Victor Tchistiak - 2019
//
// This example demonstrates master mode Bluetooth connection to a slave BT device using PIN (password)
// defined either by String "slaveName" by default "OBDII" or by MAC address
//
// This example creates a bridge between Serial and Classical Bluetooth (SPP)
// This is an extension of the SerialToSerialBT example by Evandro Copercini - 2018
//
// DO NOT try to connect to phone or laptop - they are master
// devices, same as the ESP using this code - it will NOT work!
//
// You can try to flash a second ESP32 with the example SerialToSerialBT - it should
// automatically pair with ESP32 running this code

#include "BluetoothSerial.h"

#define USE_NAME // Comment this to use MAC address instead of a slaveName
const char *pin = "1234"; // Change this to reflect the pin expected by the real slave BT device

#define LED 2
#define BUTTON 0

#if !defined(CONFIG_BT_SPP_ENABLED)
#error Serial Bluetooth not available or not enabled. It is only available for the ESP32 chip.
#endif

BluetoothSerial SerialBT;

bool press = 0, lastBtnState = 1, ledState = 0;
uint32_t lastMillis = 0;

#ifdef USE_NAME
  String slaveName = "ESP32-BT-Slave"; // Change this to reflect the real name of your slave BT device
#else
  String MACadd = "AA:BB:CC:11:22:33"; // This only for printing
  uint8_t address[6]  = {0xAA, 0xBB, 0xCC, 0x11, 0x22, 0x33}; // Change this to reflect real MAC address of your slave BT device
#endif

String myName = "ESP32-BT-Master";

String inString;

void setup() {
  bool connected;
  Serial.begin(115200);
  pinMode(BUTTON, INPUT_PULLUP);
  pinMode(LED, OUTPUT);
  digitalWrite(LED, ledState);

  SerialBT.begin(myName, true);
  Serial.printf("The device \"%s\" started in master mode, make sure slave BT device is on!\n", myName.c_str());

  #ifndef USE_NAME
    SerialBT.setPin(pin);
    Serial.println("Using PIN");
  #endif

  // connect(address) is fast (up to 10 secs max), connect(slaveName) is slow (up to 30 secs max) as it needs
  // to resolve slaveName to address first, but it allows to connect to different devices with the same name.
  // Set CoreDebugLevel to Info to view devices Bluetooth address and device names
  #ifdef USE_NAME
    connected = SerialBT.connect(slaveName);
    Serial.printf("Connecting to slave BT device named \"%s\"\n", slaveName.c_str());
  #else
    connected = SerialBT.connect(address);
    Serial.print("Connecting to slave BT device with MAC "); Serial.println(MACadd);
  #endif

  if(connected) {
    Serial.println("Connected Successfully!");
  } else {
    while(!SerialBT.connected(10000)) {
      Serial.println("Failed to connect. Make sure remote device is available and in range, then restart app.");
    }
  }
  // Disconnect() may take up to 10 secs max
  if (SerialBT.disconnect()) {
    Serial.println("Disconnected Successfully!");
  }
  // This would reconnect to the slaveName(will use address, if resolved) or address used with connect(slaveName/address).
  SerialBT.connect();
  if(connected) {
    Serial.println("Reconnected Successfully!");
  } else {
    while(!SerialBT.connected(10000)) {
      Serial.println("Failed to reconnect. Make sure remote device is available and in range, then restart app.");
    }
  }
}

void loop() {
  bool buttonState = digitalRead(BUTTON);

  if(buttonState != lastBtnState){
    press = true;
    lastMillis = millis();
  }

  if(millis() - lastMillis >= 50){
    if(press){
      if(buttonState == LOW){
        SerialBT.write('1');
        Serial.println("Button 1 Press");
      }
      press = false;
    }
    delay(20);
  }
  if (SerialBT.available() > 0) {
    char inChar = SerialBT.read();
      if (inChar != '\n'){
        inString += String(inChar);
      }else{
        Serial.printf("Reply Received: %s\n\n", inString);
        inString = "";
      }
      if(inString == "R11"){
        digitalWrite(LED, HIGH);
      }else if(inString == "R10"){
        digitalWrite(LED, LOW);
      }
  }
  lastBtnState = buttonState;
}


/************************************** END MASTER SKETCH *************************************************
**********************************************************************************************************/

//<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

/*********************************************************************************************************
**********************************BT CLASSIC SLAVE SKETCH with String reply *********************************
*************************** *****************************************************************************/

//This example code is in the Public Domain (or CC0 licensed, at your option.)
//By Evandro Copercini - 2018
//
//This example creates a bridge between Serial and Classical Bluetooth (SPP)
//and also demonstrate that SerialBT have the same functionalities of a normal Serial

#include "BluetoothSerial.h"

//#define USE_PIN // Uncomment this to use PIN during pairing. The pin is specified on the line below
const char *pin = "1234"; // Change this to more secure PIN.

String device_name = "ESP32-BT-Slave";

#if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED)
#error Bluetooth is not enabled! Please run `make menuconfig` to and enable it
#endif

#if !defined(CONFIG_BT_SPP_ENABLED)
#error Serial Bluetooth not available or not enabled. It is only available for the ESP32 chip.
#endif

BluetoothSerial SerialBT;

#define LED 2
bool ledState = 0;

void setup() {
  Serial.begin(115200);
  pinMode(LED, OUTPUT);
  digitalWrite(LED, ledState);
  SerialBT.begin(device_name); //Bluetooth device name
  Serial.printf("The device with name \"%s\" is started.\nNow you can pair it with Bluetooth!\n", device_name.c_str());
  //Serial.printf("The device with name \"%s\" and MAC address %s is started.\nNow you can pair it with Bluetooth!\n", device_name.c_str(), SerialBT.getMacString()); // Use this after the MAC method is implemented
  #ifdef USE_PIN
    SerialBT.setPin(pin);
    Serial.println("Using PIN");
  #endif
}

void loop() {
  char inComing;
  String out_str = "R";

  if (SerialBT.available()) {
    inComing = SerialBT.read();
      if(inComing == '1'){
        digitalWrite(LED, ledState = !ledState);
        ledState = digitalRead(LED);
        out_str += String(inComing);
        out_str += String(ledState);
        uint8_t buf[out_str.length()];
        memcpy(buf, out_str.c_str(), out_str.length());
        SerialBT.write(buf, out_str.length());
        SerialBT.println();
        }
        Serial.printf("Sent Reply: %s\n\n", out_str);
      }
  delay(20);
}