How to implement websocket++ ping handler?

@mac 

To implement a ping handler using WebSocket++, you can follow these steps:

1. Create a WebSocket server object with a specific endpoint and port number.
2. Add a handler for incoming messages, including handling ping messages.
3. In the message handler, check if the incoming message is a ping message.
4. If the message is a ping message, send a pong message back to the client.

Here is an example code snippet to demonstrate how to implement a ping handler in WebSocket++:

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#include <websocketpp/config/asio_no_tls.hpp>
#include <websocketpp/server.hpp>

typedef websocketpp::server<websocketpp::config::asio> server;

void on_message(websocketpp::connection_hdl hdl, server::message_ptr msg) {
    if (msg->get_opcode() == websocketpp::frame::opcode::PING) {
        server::connection_ptr con = server::get_con_from_hdl(hdl);
        con->send(msg->get_payload(), websocketpp::frame::opcode::PONG);
    }
}

int main() {
    server endpoint;

    endpoint.set_message_handler(&on_message);

    endpoint.init_asio();
    endpoint.listen(9002);
    endpoint.start_accept();

    endpoint.run();

    return 0;
}

In this code snippet, we create a WebSocket server object and set a message handler to handle incoming messages. The on_message function checks if the incoming message is a ping message and sends a pong message back to the client. Finally, we initialize the server, start listening on a specific port, and run the server.

You can customize the ping handler logic and message format according to your requirements.