//https://blog.csdn.net/Naisu_kun/article/details/115958024

#include <BLEDevice.h> // 引入相关库
#include <BLE2902.h>

#define SERVICE_UUID "4fafc201-1fb5-459e-8fcc-c5c9c331914b" // 服务 自定义UUID

#define CHARACTERISTIC_UUID "beb5483e-36e1-4688-b7f5-ea07361b26a8" // 特征UUID

bool deviceConnected = false;

BLECharacteristic *pCharacteristic;

int ledPin = 8;

 
// Server回调函数声明
class MyServerCallbacks: public BLEServerCallbacks {
    void onConnect(BLEServer* pServer) {

      //有设备接入
      Serial.println("device open~");
      digitalWrite(ledPin, LOW);
      deviceConnected = true;
    };

    void onDisconnect(BLEServer* pServer) {

      //设备断开
      Serial.println("device break~");
      // 在有设备接入后Advertising广播会被停止，所以要在设备断开连接时重新开启广播
      // 不然的话只有重启ESP32后才能重新搜索到
      pServer->startAdvertising(); //该行效果同 BLEDevice::startAdvertising();
      digitalWrite(ledPin, HIGH);
      deviceConnected = false;
    }
};

class MyCallbacks: public BLECharacteristicCallbacks {
    void onRead(BLECharacteristic* pCharacteristic) { // 客户端读取事件回调函数
    
      Serial.println("value read");
    }

    void onWrite(BLECharacteristic *pCharacteristic) { // 客户端写入事件回调函数
      Serial.println("value write");
    }
};

void bleSetup() {

  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, HIGH);
 
  BLEDevice::init("APTBLE"); // 填写自身对外显示的蓝牙设备名称，并初始化蓝牙功能

  BLEServer *pServer = BLEDevice::createServer(); // 创建服务器

  pServer->setCallbacks(new MyServerCallbacks()); // 绑定回调函数

  BLEService *pService = pServer->createService(SERVICE_UUID); // 创建服务

  pCharacteristic = pService->createCharacteristic( // 创建特征
                                                  CHARACTERISTIC_UUID, 
                                                  BLECharacteristic::PROPERTY_READ |  // 启用读取
                                                  BLECharacteristic::PROPERTY_WRITE |  // 启用写入
                                                  BLECharacteristic::PROPERTY_NOTIFY | // 启用通知
                                                  BLECharacteristic::PROPERTY_INDICATE // 启用通知
                                                  );

  pCharacteristic->setCallbacks(new MyCallbacks());

  pCharacteristic->addDescriptor(new BLE2902()); // 不加这行可能无法使用通知

  pCharacteristic->setValue("this is apt"); // 设置该Characteristic的Value值

  pService->start(); // 启动服务
  BLEDevice::startAdvertising(); // 开启Advertising广播
}

//消息通知
void bleNotify(){

      pCharacteristic->notify();
      Serial.println("notify...");
}

int loopBleSize=1000; //loop间隔
int bleMillisTime;
void bleLoop() {
  
  //1秒发送1次通知
  if (!deviceConnected)return;

  int bleTimeCurrent = millis();
  
  if(bleTimeCurrent<=0)bleMillisTime = bleTimeCurrent;

  if((bleTimeCurrent - bleMillisTime)>loopBleSize){

    bleMillisTime = bleTimeCurrent;
    pCharacteristic->notify();
    Serial.println("notify...");
  }
}