低功耗节点和友节点的Ble Mesh问题

低功耗节点和友节点之间的BLE Mesh问题可以使用以下解决方法：

解决方法1：使用广播消息传递数据 在低功耗节点发送广播消息，而友节点通过监听广播消息来接收数据。这种方法简单易实现，但广播消息有一定的范围限制，并且可能会导致网络拥堵。

示例代码：

// 低功耗节点发送广播消息
#include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEServer.h>

#define SERVICE_UUID        "4fafc201-1fb5-459e-8fcc-c5c9c331914b" // 服务UUID
#define CHARACTERISTIC_UUID "beb5483e-36e1-4688-b7f5-ea07361b26a8" // 特征UUID

void setup() {
  BLEDevice::init("LowPowerNode");
  BLEServer *pServer = BLEDevice::createServer();
  BLEService *pService = pServer->createService(SERVICE_UUID);
  BLECharacteristic *pCharacteristic = pService->createCharacteristic(
                                         CHARACTERISTIC_UUID,
                                         BLECharacteristic::PROPERTY_READ
                                       );
  pService->start();
  BLEAdvertising *pAdvertising = pServer->getAdvertising();
  pAdvertising->setScanResponse(true);
  pAdvertising->start();
}

void loop() {
  // 通过特征向低功耗节点发送数据
  BLEService *pService = BLEDevice::getServiceByUUID(SERVICE_UUID);
  BLECharacteristic *pCharacteristic = pService->getCharacteristic(CHARACTERISTIC_UUID);
  pCharacteristic->setValue("Hello, World!");
  pCharacteristic->notify();
  delay(1000);
}

// 友节点接收广播消息
#include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEServer.h>

#define SERVICE_UUID        "4fafc201-1fb5-459e-8fcc-c5c9c331914b" // 服务UUID
#define CHARACTERISTIC_UUID "beb5483e-36e1-4688-b7f5-ea07361b26a8" // 特征UUID

class MyServerCallbacks : public BLEServerCallbacks {
  void onConnect(BLEServer* pServer) {
    Serial.println("Connected");
  }

  void onDisconnect(BLEServer* pServer) {
    Serial.println("Disconnected");
  }
};

void setup() {
  Serial.begin(115200);
  BLEDevice::init("FriendNode");
  BLEServer *pServer = BLEDevice::createServer();
  pServer->setCallbacks(new MyServerCallbacks());
  BLEService *pService = pServer->createService(SERVICE_UUID);
  pService->start();
  BLEAdvertising *pAdvertising = pServer->getAdvertising();
  pAdvertising->start();
}

void loop() {
  // 监听特征接收到的广播消息
  BLEService *pService = BLEDevice::getServiceByUUID(SERVICE_UUID);
  BLECharacteristic *pCharacteristic = pService->getCharacteristic(CHARACTERISTIC_UUID);
  std::string value = pCharacteristic->getValue();
  if (value.length() > 0) {
    Serial.println(value.c_str());
  }
  delay(1000);
}

解决方法2：使用GATT协议传递数据 低功耗节点和友节点之间建立GATT连接，通过GATT协议进行数据传输。这种方法可以实现可靠的数据传输，但需要额外的连接和维护工作。

示例代码：

// 低功耗节点发送数据
#include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEServer.h>

#define SERVICE_UUID        "4fafc201-1fb5-459e-8fcc-c5c9c331914b" // 服务UUID
#define CHARACTERISTIC_UUID "beb5483e-36e1-4688-b7f5-ea07361b26a8" // 特征UUID

void setup() {
  BLEDevice::init("LowPowerNode");
  BLEServer *pServer = BLEDevice::createServer();
  BLEService *pService = pServer->createService(SERVICE_UUID);
  BLECharacteristic *pCharacteristic = pService->createCharacteristic(
                                         CHARACTERISTIC_UUID,
                                         BLECharacteristic::PROPERTY_READ | BLECharacteristic::PROPERTY_NOTIFY
                                       );
  pService->start();
  BLEAdvertising *pAdvertising = pServer->getAdvertising();
  p