imx1052mini板 lwip UDP收不到组播消息

发布于 2019-09-11 14:17:39 浏览：1770 订阅该版

* 本帖最后由 aozima 于 2019-9-11 15:58 编辑 *

```                sockfd = socket(AF_INET, SOCK_DGRAM, 0);
                if (sockfd == -1)
                {
                        perror("socket()");
                }
                
                memset(&local_addr, 0, sizeof(local_addr));
                local_addr.sin_family = AF_INET;
                local_addr.sin_port = htons(4000);
                local_addr.sin_addr.s_addr = htonl(INADDR_ANY);
                /* 分配接收用的数据缓冲 */
                
                err = bind(sockfd, (struct sockaddr *)&local_addr, sizeof(local_addr));
                if (err < 0)
                {
                        perror("bind()");
                }
                
                int loop =1;
                err = setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop));
                if (err < 0)
                {
                        perror("setsockopt():IP_MULTICAST_LOOP");
                }
                
                struct ip_mreq mreq;
                mreq.imr_multiaddr.s_addr = inet_addr("224.0.0.88");
                mreq.imr_interface.s_addr = htonl(INADDR_ANY);
                err = setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq));```