ESP32 블루투스 연동 코드

#include <BLEDevice.h>

#include <BLEServer.h>

#include <BLEUtils.h>

#include <BLE2902.h>

BLEServer *pServer = NULL;

BLECharacteristic * pTxCharacteristic;

bool deviceConnected = false;

bool oldDeviceConnected = false;

#define SERVICE_UUID           "6E400001-B5A3-F393-E0A9-E50E24DCCA9E"

#define CHARACTERISTIC_UUID_RX "6E400002-B5A3-F393-E0A9-E50E24DCCA9E"

#define CHARACTERISTIC_UUID_TX "6E400003-B5A3-F393-E0A9-E50E24DCCA9E"

class MyServerCallbacks: public BLEServerCallbacks {

    void onConnect(BLEServer* pServer) {

      deviceConnected = true;

    };

    void onDisconnect(BLEServer* pServer) {

      deviceConnected = false;

    }

};

class MyCallbacks: public BLECharacteristicCallbacks {

    void onWrite(BLECharacteristic *pCharacteristic) {

      std::string rxValue = pCharacteristic->getValue();

      if (rxValue.length() > 0) {

        Serial.println("Received from client:");

        Serial.println(rxValue.c_str());        

      }

    }

};

void setup() {

  Serial.begin(115200);

  BLEDevice::init("UART Service");

  pServer = BLEDevice::createServer();

  pServer->setCallbacks(new MyServerCallbacks());

  BLEService *pService = pServer->createService(SERVICE_UUID);

  pTxCharacteristic = pService->createCharacteristic(

                    CHARACTERISTIC_UUID_TX,

                    BLECharacteristic::PROPERTY_NOTIFY

                  );

  pTxCharacteristic->addDescriptor(new BLE2902());

  BLECharacteristic * pRxCharacteristic = pService->createCharacteristic(

                       CHARACTERISTIC_UUID_RX,

                      BLECharacteristic::PROPERTY_WRITE

                    );

  pRxCharacteristic->setCallbacks(new MyCallbacks());

  pService->start();

  pServer->getAdvertising()->start();

}

void loop() {

    if (!deviceConnected && oldDeviceConnected) {

        delay(500);

        pServer->startAdvertising();

        oldDeviceConnected = deviceConnected;

    }

    if (deviceConnected && !oldDeviceConnected) {

        oldDeviceConnected = deviceConnected;

    }

}