How to stop uWS::Hub objects and subscription connections，

[paddy709]

Code:
void MarketDataThread::Start(std::string channel, std::string symbol)
{
uWS::Hub hub;

hub.onMessage([&](uWS::WebSocket<uWS::CLIENT> *ws, char *message, size_t length, uWS::OpCode opCode)
               {
        // Handle incoming message from WebSocket
        std::string msg(message, length);

        std::cout << "Received message: " << msg << std::endl; });

hub.onConnection([&](uWS::WebSocket<uWS::CLIENT> *ws, uWS::HttpRequest req)
                  {
                      std::cout << "onConnection." << std::endl;
hub.onDisconnection([&](uWS::WebSocket<uWS::SERVER> *ws, int code, char *message, size_t length)
                    { 
                         std::cout << "onDisconnection." << std::endl;
                    });

// hub2.connect(*****, nullptr);


// 运行事件循环
hub.run();

}

void MarketDataThread::Stop()
{
// ？？？？ HOW can I Do？
}

After I dynamically start the subscription in the thread, how do I stop the running of the uWS::Hub object in the stop? There is a uWS::Hub object in each thread. How do I implement it? thanks。