c++ udp广播。我需要一个套接字来读取，另一个套接字来发送吗？

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

#define PORT 12345
#define BROADCAST_ADDR "255.255.255.255"

int main() {
    // 创建接收套接字
    int recvSocket = socket(AF_INET, SOCK_DGRAM, 0);
    if (recvSocket < 0) {
        std::cerr << "Failed to create receive socket." << std::endl;
        return -1;
    }

    // 设置接收套接字选项
    int broadcastEnable = 1;
    if (setsockopt(recvSocket, SOL_SOCKET, SO_BROADCAST, &broadcastEnable, sizeof(broadcastEnable)) < 0) {
        std::cerr << "Failed to set receive socket options." << std::endl;
        return -1;
    }

    // 绑定接收套接字到指定端口
    struct sockaddr_in recvAddr{};
    memset(&recvAddr, 0, sizeof(recvAddr));
    recvAddr.sin_family = AF_INET;
    recvAddr.sin_port = htons(PORT);
    recvAddr.sin_addr.s_addr = htonl(INADDR_ANY);
    if (bind(recvSocket, (struct sockaddr*)&recvAddr, sizeof(recvAddr)) < 0) {
        std::cerr << "Failed to bind receive socket." << std::endl;
        return -1;
    }

    // 创建发送套接字
    int sendSocket = socket(AF_INET, SOCK_DGRAM, 0);
    if (sendSocket < 0) {
        std::cerr << "Failed to create send socket." << std::endl;
        return -1;
    }

    // 设置发送套接字选项
    if (setsockopt(sendSocket, SOL_SOCKET, SO_BROADCAST, &broadcastEnable, sizeof(broadcastEnable)) < 0) {
        std::cerr << "Failed to set send socket options." << std::endl;
        return -1;
    }

    // 构造广播地址
    struct sockaddr_in broadcastAddr{};
    memset(&broadcastAddr, 0, sizeof(broadcastAddr));
    broadcastAddr.sin_family = AF_INET;
    broadcastAddr.sin_port = htons(PORT);
    if (inet_pton(AF_INET, BROADCAST_ADDR, &(broadcastAddr.sin_addr)) <= 0) {
        std::cerr << "Failed to construct broadcast address." << std::endl;
        return -1;
    }

    // 发送UDP广播消息
    const char* message = "Hello, broadcast!";
    if (sendto(sendSocket, message, strlen(message), 0, (struct sockaddr*)&broadcastAddr, sizeof(broadcastAddr)) < 0) {
        std::cerr << "Failed to send broadcast message." << std::endl;
        return -1;
    }

    // 接收UDP广播消息
    char buffer[1024];
    struct sockaddr_in senderAddr{};
    socklen_t senderAddrLen = sizeof(senderAddr);
    ssize_t recvSize = recvfrom(recvSocket, buffer, sizeof(buffer), 0, (struct sockaddr*)&senderAddr, &senderAddrLen);
    if (recvSize < 0) {
        std::cerr << "Failed to receive broadcast message." << std::endl;
        return -1;
    }

    // 处理接收到的消息
    buffer[recvSize] = '\0';
    std::cout << "Received broadcast message: " << buffer << std::endl;

    // 关闭套接字
    close(recvSocket);
    close(sendSocket);

    return 0;
}