Generate C++ code to connect a group of peer-to-peer network nodes.

Sure, I can provide you with a basic example of how you might establish connections to peer-to-peer network nodes in C++. Please note that this is a simplified example and doesn't include error handling or more advanced features like NAT traversal, encryption, or protocol handling.

In this example, we'll use sockets to create a basic peer-to-peer connection. Keep in mind that in a real-world scenario, you'd likely use a more specialized networking library that handles the complexities of peer-to-peer networking.

#include <iostream>
#include <cstring>
#include <cstdlib>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>

const int MAX_CONNECTIONS = 10;
const int PORT = 12345;

int main() {
    int serverSocket = socket(AF_INET, SOCK_STREAM, 0);
    if (serverSocket == -1) {
        std::cerr << "Error creating socket." << std::endl;
        return 1;
    }

    sockaddr_in serverAddr;
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_port = htons(PORT);
    serverAddr.sin_addr.s_addr = INADDR_ANY;

    if (bind(serverSocket, (struct sockaddr*)&serverAddr, sizeof(serverAddr)) == -1) {
        std::cerr << "Error binding socket." << std::endl;
        close(serverSocket);
        return 1;
    }

    if (listen(serverSocket, MAX_CONNECTIONS) == -1) {
        std::cerr << "Error listening on socket." << std::endl;
        close(serverSocket);
        return 1;
    }

    std::cout << "Server listening on port " << PORT << std::endl;

    while (true) {
        sockaddr_in clientAddr;
        socklen_t clientAddrSize = sizeof(clientAddr);
        int clientSocket = accept(serverSocket, (struct sockaddr*)&clientAddr, &clientAddrSize);

        if (clientSocket == -1) {
            std::cerr << "Error accepting connection." << std::endl;
            continue;
        }

        char clientIP[INET_ADDRSTRLEN];
        inet_ntop(AF_INET, &(clientAddr.sin_addr), clientIP, INET_ADDRSTRLEN);
        std::cout << "Connection established with client " << clientIP << std::endl;

        // Now you can communicate with the client using clientSocket

        close(clientSocket); // Close the connection
    }

    close(serverSocket);
    return 0;
}

Remember that this code only represents a basic example of a server listening for incoming connections from peer nodes. In a real-world scenario, you would likely want to implement more advanced features, error handling, security measures, and potentially use a dedicated networking library that suits your specific use case.