Lập trình C++ kết nối camera IP qua giao thức P2P trên Linux

// p2p_camera_connect.cpp
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <cstring>
#include <iostream>

struct P2PConfig {
    std::string camera_uid;    // UID camera P2P
    std::string stun_server;   // STUN server address
    uint16_t    stun_port;     // STUN server port
    uint16_t    local_port;    // Local UDP port
};

class P2PConnection {
public:
    bool init(const P2PConfig& config) {
        sock_fd_ = socket(AF_INET, SOCK_DGRAM, 0);
        if (sock_fd_ < 0) return false;

        struct sockaddr_in local_addr{};
        local_addr.sin_family = AF_INET;
        local_addr.sin_addr.s_addr = INADDR_ANY;
        local_addr.sin_port = htons(config.local_port);

        if (bind(sock_fd_, (struct sockaddr*)&local_addr,
                 sizeof(local_addr)) < 0) {
            return false;
        }

        // Step 1: Query STUN to discover public IP/port
        discover_public_endpoint(config.stun_server,
                                 config.stun_port);

        // Step 2: Register with P2P relay server
        register_with_relay(config.camera_uid);

        // Step 3: Attempt UDP hole punching
        return attempt_hole_punch();
    }

    // Sau khi kết nối P2P thành công,
    // mở RTSP stream qua tunnel
    bool start_rtsp_stream(const std::string& rtsp_url) {
        // Forward RTSP traffic qua P2P tunnel
        // Sử dụng FFmpeg hoặc GStreamer để decode
        return true;
    }

private:
    int sock_fd_ = -1;
    // ... implementation details
};