BLE CarLock rev_01

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    - Project: BLE CarLock
    - Source Code NOT compiled for: XIAO ESP32S3
    - Source Code created on: 2025-12-26 20:54:16

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* Enable BLE advertising on the XIAO ESP32S3 to */
    /* broadcast device presence and identify it to */
    /* nearby BLE devices. */
/****** END SYSTEM REQUIREMENTS *****/


/* START CODE */

/****** DEFINITION OF LIBRARIES *****/
#include <BLEDevice.h>  //https://github.com/nkolban/ESP32_BLE_Arduino
#include <BLEUtils.h>  //https://github.com/nkolban/ESP32_BLE_Arduino
#include <BLEScan.h>   //https://github.com/nkolban/ESP32_BLE_Arduino
#include <BLEAdvertisedDevice.h>  //https://github.com/nkolban/ESP32_BLE_Arduino
#include <ArduinoBLE.h>  //https://github.com/arduino-libraries/ArduinoBLE

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/

// Define UUID for BLE service and characteristics
#define SERVICE_UUID        "0000180a-0000-1000-8000-00805f9b34fb"
#define CHARACTERISTIC_UUID "00002a00-0000-1000-8000-00805f9b34fb"

// Define pin for controlling car door lock
#define DOOR_LOCK_PIN       2

// Create BLE server and characteristics
BLEServer* pServer;
BLECharacteristic* pCharacteristic;

// Create variable to store lock status
bool isLocked = false;

// Function to handle BLE write events
class MyServerCallbacks: public BLEServerCallbacks {
    void onWrite(BLECharacteristic *pCharacteristic) {
        // Get data from BLE write event
        std::string value = pCharacteristic->getValue();

        // Check if data is "lock" or "unlock"
        if (value == "lock") {
            // Lock the car door
            digitalWrite(DOOR_LOCK_PIN, HIGH);
            isLocked = true;
        } else if (value == "unlock") {
            // Unlock the car door
            digitalWrite(DOOR_LOCK_PIN, LOW);
            isLocked = false;
        }
    }
};

void setup() {
    // Initialize serial communication
    Serial.begin(9600);

    // Set pin modes
    pinMode(DOOR_LOCK_PIN, OUTPUT);

    // Initialize BLE
    BLEDevice::init("Car Door Lock");
    pServer = BLEDevice::createServer();
    pServer->setCallbacks(new MyServerCallbacks());

    // Create BLE service
    BLEService *pService = pServer->createService(SERVICE_UUID);

    // Create BLE characteristic
    pCharacteristic = pService->createCharacteristic(
                        CHARACTERISTIC_UUID,
                        BLECharacteristic::PROPERTY_WRITE
                      );

    // Start the service
    pService->start();

    // Start advertising
    BLEAdvertising *pAdvertising = pServer->getAdvertising();
    pAdvertising->start();
}

void loop() {
    // Check if car door is locked
    if (isLocked) {
        Serial.println("Car door is locked.");
    } else {
        Serial.println("Car door is unlocked.");
    }

    // Delay for 1 second
    delay(1000);
}

// Reference: https://randomnerdtutorials.com/esp32-bluetooth-low-energy-ble-arduino-ide/

/* END CODE */