ソース：ESP32 WROVER CAM BLEでスマホからLEDをON/OFFする

 /**********************************************************************

  Filename    : BLE_USART

  Description : Esp32 communicates with the phone by BLE and sends incoming data via a serial port

  Auther      : www.freenove.com

  Modification: 2024/06/19

**********************************************************************/

#define PIN_LED 2

#include "BLEDevice.h"

#include "BLEServer.h"

#include "BLEUtils.h"

#include "BLE2902.h"

 

BLECharacteristic *pCharacteristic;

bool deviceConnected = false;

uint8_t txValue = 0;

long lastMsg = 0;

String rxload="Test\n";

 

#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) {

      String rxValue = pCharacteristic->getValue();

      if (rxValue.length() > 0) {

        rxload="";

        for (int i = 0; i < rxValue.length(); i++){

          rxload +=(char)rxValue[i];

        }

      }

    }

};

 

void setupBLE(String BLEName){

  const char *ble_name=BLEName.c_str();

  BLEDevice::init(ble_name);

  BLEServer *pServer = BLEDevice::createServer();

  pServer->setCallbacks(new MyServerCallbacks());

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

  pCharacteristic= pService->createCharacteristic(CHARACTERISTIC_UUID_TX,BLECharacteristic::PROPERTY_NOTIFY);

  pCharacteristic->addDescriptor(new BLE2902());

  BLECharacteristic *pCharacteristic = pService->createCharacteristic(CHARACTERISTIC_UUID_RX,BLECharacteristic::PROPERTY_WRITE);

  pCharacteristic->setCallbacks(new MyCallbacks());

  pService->start();

  pServer->getAdvertising()->start();

  Serial.println("Waiting a client connection to notify...");

}

void setup() {

  Serial.begin(115200);

  setupBLE("ESP32_Bluetooth");

  pinMode(PIN_LED, OUTPUT);

  digitalWrite(PIN_LED, HIGH); // turn the LED on by making the voltage LOW

}

 

void loop() {

  long now = millis();

  if (now - lastMsg > 100) {

    if (deviceConnected&&rxload.length()>0) {

        Serial.println(rxload);

        if(rxload == "on\r\n"){

          digitalWrite(PIN_LED, LOW); // turn the LED on by making the voltage LOW

          Serial.println("-LED ON");

        }else if(rxload == "off\r\n"){

          digitalWrite(PIN_LED, HIGH); // turn the LED on by making the voltage LOW

          Serial.println("-LED OFF");

        }

        rxload="";

    }

    if(Serial.available()>0){

        String str=Serial.readString();

        const char *newValue=str.c_str();

        pCharacteristic->setValue(newValue);

        pCharacteristic->notify();

    }

    lastMsg = now;

  }

}