prs/Arduino/Digital Key v1/MAIN_WIFI_MQTT/WS_Bluetooth.cpp

#include "WS_Bluetooth.h"

BLEServer* pServer;                                                             // Used to represent a BLE server
BLECharacteristic* pTxCharacteristic;
BLECharacteristic* pRxCharacteristic;

/**********************************************************  Bluetooth   *********************************************************/

class MyServerCallbacks : public BLEServerCallbacks {                           //By overriding the onConnect() and onDisconnect() functions
    void onConnect(BLEServer* pServer) {                                        // When the Device is connected, "Device connected" is printed.
    Serial.println("Device connected"); 
  }

  void onDisconnect(BLEServer* pServer) {                                       // "Device disconnected" will be printed when the device is disconnected
    Serial.println("Device disconnected");

    BLEAdvertising *pAdvertising = BLEDevice::getAdvertising();                 // Re-broadcast so that the device can query
    pAdvertising->addServiceUUID(SERVICE_UUID);                                 // Re-broadcast so that the device can query
    pAdvertising->setScanResponse(true);                                        // Re-broadcast so that the device can query
    pAdvertising->setMinPreferred(0x06);                                        // Re-broadcast so that the device can query 
    pAdvertising->setMinPreferred(0x12);                                        // Re-broadcast so that the device can query 
    BLEDevice::startAdvertising();                                              // Re-broadcast so that the device can query 
    pRxCharacteristic->notify();                                                // Re-broadcast so that the device can query  
    pAdvertising->start();                                                      // Re-broadcast so that the device can query
  }
};
class MyRXCallback : public BLECharacteristicCallbacks {
  void onWrite(BLECharacteristic* pCharacteristic) {                            // The onWrite function is called when the remote device sends data to your feature
    std::string rxValue = pCharacteristic->getValue();
    if (!rxValue.empty()) {
      // The received data rxValue is processed here
      if(rxValue.length() == 1)
      {
        printf("%s\n", rxValue.c_str());                                        // Print output through the serial port
        uint8_t* valueBytes = reinterpret_cast<uint8_t*>(const_cast<char*>(rxValue.c_str())); // Convert value to uint8 t*
        Relay_Analysis(valueBytes,Bluetooth_Mode);                              // pilot relay
      }
      else if(rxValue.length() == 2)
      {
        if(Extension_Enable)
        {
          printf("%s\n", rxValue.c_str());                                      // Print output through the serial port       
          uint8_t* valueBytes = reinterpret_cast<uint8_t*>(const_cast<char*>(rxValue.c_str())); // Convert value to uint8 t*
          if(valueBytes[0] == 0x06)                                             // Instruction check correct
            RS485_Analysis(valueBytes);                                         // Control external relay
          else
            printf("Note : Non-instruction data was received - Bluetooth !\r\n");
        }
        else
          printf("Note : Non-instruction data was received - Bluetooth !\r\n");
      }
      else
      {
        printf("Note : Non-instruction data was received - Bluetooth !\r\n");
      }
      pRxCharacteristic->setValue("");                                           // After data is read, set it to blank for next read
    }
  }
};

void Bluetooth_SendData(char* Data) {                                           // Send data using Bluetooth
  if (Data != nullptr && strlen(Data) > 0) {
    if (pServer->getConnectedCount() > 0) {  
      std::string SendValue = Data;                       
      pTxCharacteristic->setValue(SendValue);                                   // Set SendValue to the eigenvalue
      pTxCharacteristic->notify();                                              // Sends a notification to all connected devices
    }
  }
}
void Bluetooth_Init()
{
  /*************************************************************************
  Bluetooth
  *************************************************************************/
  BLEDevice::init("ESP32 S3 Relay 6CH");                                        // Initialize Bluetooth and start broadcasting                           
  pServer = BLEDevice::createServer();                                          
  pServer->setCallbacks(new MyServerCallbacks());                               
  BLEService* pService = pServer->createService(SERVICE_UUID);                  
  pTxCharacteristic = pService->createCharacteristic(
                                    TX_CHARACTERISTIC_UUID,
                                    BLECharacteristic:: PROPERTY_READ);         // The eigenvalues are readable and can be read by remote devices
  pRxCharacteristic = pService->createCharacteristic(
                                    RX_CHARACTERISTIC_UUID,
                                    BLECharacteristic::PROPERTY_WRITE);         // The eigenvalues are writable and can be written to by remote devices
  pRxCharacteristic->setCallbacks(new MyRXCallback());

  pRxCharacteristic->setValue("Successfully Connect To ESP32-S3-Relay-6CH");      
  pService->start();   

  BLEAdvertising *pAdvertising = BLEDevice::getAdvertising();                   
  pAdvertising->addServiceUUID(SERVICE_UUID);                                   
  pAdvertising->setScanResponse(true);                                          
  pAdvertising->setMinPreferred(0x06);                                          
  pAdvertising->setMinPreferred(0x12);                                          
  BLEDevice::startAdvertising();                                                
  pRxCharacteristic->notify();                                                    
  pAdvertising->start();
  RGB_Light(0, 0, 60); 
  delay(1000);
  RGB_Light(0, 0, 0); 
  printf("Now you can read it in your phone!\r\n");
}