* @brief This function is for creating a udp server on RT-Thread */
| 40 | * @brief This function is for creating a udp server on RT-Thread |
| 41 | */ |
| 42 | static void udpserv(void *paramemter) |
| 43 | { |
| 44 | int sock; |
| 45 | int bytes_read; |
| 46 | char *recv_data; |
| 47 | socklen_t addr_len; |
| 48 | struct sockaddr_in server_addr, client_addr; |
| 49 | |
| 50 | struct timeval timeout; |
| 51 | fd_set readset; |
| 52 | /* Allocate space for recv_data */ |
| 53 | /* 分配接收用的数据缓冲 */ |
| 54 | recv_data = rt_malloc(BUFSZ); |
| 55 | if (recv_data == RT_NULL) |
| 56 | { |
| 57 | LOG_E("No memory"); |
| 58 | return; |
| 59 | } |
| 60 | /* Create a socket and set it to SOCK_DGRAM(UDP) */ |
| 61 | /* 创建一个socket，类型是SOCK_DGRAM，UDP类型 */ |
| 62 | if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1) |
| 63 | { |
| 64 | LOG_E("Create socket error"); |
| 65 | goto __exit; |
| 66 | } |
| 67 | /* Initialize server side address */ |
| 68 | /* 初始化服务端地址 */ |
| 69 | server_addr.sin_family = AF_INET; |
| 70 | server_addr.sin_port = htons(port); |
| 71 | server_addr.sin_addr.s_addr = INADDR_ANY; |
| 72 | rt_memset(&(server_addr.sin_zero), 0, sizeof(server_addr.sin_zero)); |
| 73 | /* Bind socket to server side address */ |
| 74 | /* 绑定socket到服务端地址 */ |
| 75 | if (bind(sock, (struct sockaddr *)&server_addr, |
| 76 | sizeof(struct sockaddr)) == -1) |
| 77 | { |
| 78 | LOG_E("Unable to bind"); |
| 79 | goto __exit; |
| 80 | } |
| 81 | |
| 82 | addr_len = sizeof(struct sockaddr); |
| 83 | LOG_I("UDPServer Waiting for client on port %d...", port); |
| 84 | |
| 85 | started = 1; |
| 86 | is_running = 1; |
| 87 | |
| 88 | timeout.tv_sec = 3; |
| 89 | timeout.tv_usec = 0; |
| 90 | |
| 91 | while (is_running) |
| 92 | { |
| 93 | FD_ZERO(&readset); |
| 94 | FD_SET(sock, &readset); |
| 95 | |
| 96 | /* Wait for read or write */ |
| 97 | if (select(sock + 1, &readset, RT_NULL, RT_NULL, &timeout) == 0) |
| 98 | continue; |
| 99 | /* The maximum size received from sock is BUFSZ-1 bytes*/ |