An example of using µWebSockets in a C++ server

uws.cpp

#include <uWS/uWS.h>

#include <iostream>

unsigned long getTime();

int main(int argc, char *argv[]) {
    uWS::Hub h;

    h.onMessage([](uWS::WebSocket<uWS::SERVER> *ws, char *data, size_t length, uWS::OpCode opCode) {
        ws->send(data, length, opCode);
	// Sending binary:
	// ws->send(data, size, uWS::OpCode::BINARY);
    });

    h.onConnection([](uWS::WebSocket<uWS::SERVER> *ws, uWS::HttpRequest req) {
        
    });

    h.onDisconnection([](uWS::WebSocket<uWS::SERVER> *ws, int code, char *message, size_t length) {
        
    });

    // Uncomment this code for secure WebSockets
    // uS::TLS::Context tls = uS::TLS::createContext("ssl/cert.pem", "ssl/key.pem", "key");

    if (h.listen(9002/*, tls*/)) {
        unsigned long targetDuration = 1000 / 30;
        unsigned long lastFrame = getTime();
        milliseconds duration(targetDuration);

        while (true) {
            h.poll();

            // Game logic here

            unsigned long timeSinceLast = getTime() - lastFrame;

            if (timeSinceLast < targetDuration) {
                milliseconds intervalDuration(targetDuration - timeSinceLast);
                std::this_thread::sleep_for(intervalDuration);
            }

            lastFrame = getTime();
        }
    }

    return 0;
}

unsigned long getTime() {
    return system_clock::now().time_since_epoch() / milliseconds(1);
}