c++ tcpserver esp32

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static void app_tcp_server_multi_conn_task(void *arg) {     struct sockaddr_in serv_addr;     fd_set all_set, read_set; /*!< 定义文件句柄集合 */     int sockfd_max = 0;       /*!< 文件句柄最大值 */       int serv_sockfd = socket(AF_INET, SOCK_STREAM, 0);     if (serv_sockfd < 0)     {         ESP_LOGE(TAG, "Unable to create socket: errno %d", errno);         vTaskDelete(NULL);     }     ESP_LOGI(TAG, "Socket created, serv_sockfd=%d", serv_sockfd);       bzero(&serv_addr, sizeof(struct sockaddr_in));     serv_addr.sin_family = AF_INET;     serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);     serv_addr.sin_port = htons(TCP_SERVER_PORT);       if (bind(serv_sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0)     {         ESP_LOGE(TAG, "Socket unable to bind: errno %d", errno);         vTaskDelete(NULL);     }     ESP_LOGI(TAG, "Socket binded");       if (listen(serv_sockfd, TCP_SERVER_LISTEN_CLIENT_NUM) < 0)     {         ESP_LOGE(TAG, "Error occured during listen: errno %d", errno);         vTaskDelete(NULL);     }     ESP_LOGI(TAG, "Socket listening");       FD_ZERO(&all_set);             /*!< 清空集合 */     FD_SET(serv_sockfd, &all_set); /*!< 添加serv_sockfd */     sockfd_max = serv_sockfd;       while (1)     {         read_set = all_set;         if (select(sockfd_max + 1, &read_set, NULL, NULL, NULL) == -1) /*!< 监听句柄集的可读性 */         {             ESP_LOGE(TAG, "Sever select error");         }         for (int sockfd = 0; sockfd <= sockfd_max; sockfd++) /*!< 从零开始判断 */         {             if (!FD_ISSET(sockfd, &read_set)) /*!< sockfd在集合中状态是否变化 */             {                 continue; /*!< 跳出当前循环 */             }             if (sockfd == serv_sockfd) /*!< 新的客户端连接 */             {                 struct sockaddr_in cli_addr;                 socklen_t cli_addr_len;                 int cli_sockfd;                 cli_addr_len = sizeof(cli_addr);                 memset(&cli_addr, 0, cli_addr_len);                 cli_sockfd = accept(serv_sockfd, (struct sockaddr *)&cli_addr, &cli_addr_len);                 if (cli_sockfd < 0)                 {                     ESP_LOGE(TAG, "Unable to accept connection: errno %d", errno);                 }                 else                 {                     FD_SET(cli_sockfd, &all_set);                     if (cli_sockfd > sockfd_max)                     {                         sockfd_max = cli_sockfd;                     }                     ESP_LOGI(TAG, "sockfd_max=%d", sockfd_max);                     ESP_LOGI(TAG, "A new client[cli_sockfd=%d] is connected from %s", cli_sockfd, inet_ntoa(cli_addr.sin_addr));                 }             }             else /*!< 客户端的通信数据 */             {                 char rx_buffer[128] = {0};                 int len = recv(sockfd, rx_buffer, sizeof(rx_buffer) - 1, 0);                 if (len < 0)                 {                     ESP_LOGE(TAG, "Recv failed: errno %d", errno);                     FD_CLR(sockfd, &all_set); /*!< 从集合中删除 */                     close(sockfd);                     ESP_LOGI(TAG, "sockfd_max=%d", sockfd_max);                     break;                 }                 else if (len == 0)                 {                     ESP_LOGI(TAG, "Connection closed");                     FD_CLR(sockfd, &all_set); /*!< 从集合中删除 */                     close(sockfd);                     ESP_LOGI(TAG, "sockfd_max=%d", sockfd_max);                     break;                 }                 else                 {                     ESP_LOGI(TAG, "Received %d bytes from socket_fd[%d]:", len, sockfd);                     ESP_LOGI(TAG, "%s", rx_buffer);                       flow_control_msg_t msg = {                         .packet = rx_buffer,                         .length = len};                     if (xQueueSend(flow_control_queue, &msg, pdMS_TO_TICKS(FLOW_CONTROL_QUEUE_TIMEOUT_MS)) != pdTRUE)                     {                         ESP_LOGE(TAG, "send flow control message failed or timeout");                        //free rx_buffer?                     }                 }             }         }     }       vTaskDelete(NULL); }