基于 Arduino 编写 ESP32 BLE Server 例程

测试代码如下：

• 支持 BLE 连接
• 支持 BLE 数据传输

#include <BLEDevice.h>
#include <BLEServer.h>
#include <BLEUtils.h>namespace BLEServerDemo {BLEServer *pServer = nullptr;
BLEService *pService = nullptr;
BLECharacteristic *pCharacteristic = nullptr;bool deviceConnected = false;class ServerCallbacks : public BLEServerCallbacks {void onConnect(BLEServer *pServer) {deviceConnected = true;Serial.println("BLE connected");}void onDisconnect(BLEServer *pServer) {deviceConnected = false;Serial.println("BLE disconnected");pServer->startAdvertising();  // Restart advertising after disconnection}
};class CharacteristicCallbacks : public BLECharacteristicCallbacks {void onWrite(BLECharacteristic *pCharacteristic) {std::string value = pCharacteristic->getValue();Serial.print("Received Value: ");for (int i = 0; i < value.length(); i++) {// Serial.print(value[i]);Serial.print(value[i],HEX);Serial.print(" ");}Serial.println();}
};void initBLE() {BLEDevice::init("MyESP32BLEServer");pServer = BLEDevice::createServer();pServer->setCallbacks(new ServerCallbacks());pService = pServer->createService(BLEUUID("0000fff0-0000-1000-8000-00805f9b34fb"));pCharacteristic = pService->createCharacteristic(BLEUUID("0000fff1-0000-1000-8000-00805f9b34fb"),BLECharacteristic::PROPERTY_READ | BLECharacteristic::PROPERTY_WRITE);pCharacteristic->setCallbacks(new CharacteristicCallbacks());pService->start();pServer->getAdvertising()->start();Serial.println("Waiting for client connection...");
}void handleBLE() {if (deviceConnected) {// Handle other tasks as needed}
}}  // namespace BLEServerDemovoid setup() {Serial.begin(115200);BLEServerDemo::initBLE();
}void loop() {BLEServerDemo::handleBLE();
}