ESP32의 블루투스 데이터보내기 예제

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#include <BLEDevice.h> #include <BLEServer.h> #include <BLEUtils.h> #include <BLE2902.h>   BLECharacteristic *pCharacteristic; bool deviceConnected = false;   #define SERVICE_UUID        "4fafc201-1fb5-459e-8fcc-c5c9c331914b" #define CHARACTERISTIC_UUID "beb5483e-36e1-4688-b7f5-ea07361b26a8"     class MyServerCallbacks: public BLEServerCallbacks {     void onConnect(BLEServer* pServer) {       deviceConnected = true;     };     void onDisconnect(BLEServer* pServer) {       deviceConnected = false;     } };     void setup() {      Serial.begin(115200);     BLEDevice::init("MyESP32");   BLEServer *pServer = BLEDevice::createServer();   pServer->setCallbacks(new MyServerCallbacks());     BLEService *pService = pServer->createService(SERVICE_UUID);     pCharacteristic = pService->createCharacteristic(                       CHARACTERISTIC_UUID,                       BLECharacteristic::PROPERTY_READ   |                       BLECharacteristic::PROPERTY_WRITE  |                       BLECharacteristic::PROPERTY_NOTIFY |                       BLECharacteristic::PROPERTY_INDICATE                     );      pCharacteristic->addDescriptor(new BLE2902());   pService->start();     pServer->getAdvertising()->start();   }   void loop() {     if (deviceConnected) {       char measure[2] = {10, 25};     pCharacteristic->setValue(std::string(measure, sizeof(measure)));     pCharacteristic->notify();       }   delay(3000);   } Colored by Color Scripter

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ESP32에 센서를 달고 센서값의 데이터를 보낼때 사용한 코드입니다

if (deviceConnected) { // 블루투스가 디바이스에 연결됬을시

 

    char measure[2] = {센서값1, 센서값2}; // 크기는 늘려도 상관없습니다

    pCharacteristic->setValue(std::string(measure, sizeof(measure)));

    pCharacteristic->notify();

  }

  delay(3000);

}