Lwip之TCP服务端示例记录(1对多)

前言

1. 实现多个客户端同时连接
2. 初步代码结构已经实现完成(通过轮训的方式)

//
// Created by shchl on 2024/3/8.
//
#if  1#include <string.h>
#include "lwip/api.h"
#include "FreeRTOS.h"
#include "task.h"
#include "usart.h"
#include "lwip_comm.h"#define CLIENT_LIST_SIZE 3
typedef struct {u8_t stat;/*0表示未连接，1表示已建立连接*/struct netconn *conn;struct netbuf *net_buf;ip_addr_t ip; /*地址*/u16_t port;/*端口*/
#define BUF_SIZE 1024u8_t buf[BUF_SIZE];/*存放数据*/} client_pcb;/*客户端控制块*/
static TaskHandle_t tcp_server; /*任务句柄*/
static TaskHandle_t tcp_client; /*任务句柄*/
static void tcp_server_entity(void *args);client_pcb client_list[CLIENT_LIST_SIZE]; /*客户端列表*/static void tcp_client_request_entity(void *args);void netconn_tcp_server_create_thread() {/*初始化*/memset(client_list, 0, sizeof(client_list));xTaskCreate((TaskFunction_t) tcp_server_entity,"tcp_server",256,NULL,10,&tcp_server);xTaskCreate((TaskFunction_t) tcp_client_request_entity,"tcp_client",256,NULL,9,&tcp_client);}#define TCP_SERVER_RX_BUFSIZE 1500
static struct netconn *conn;
static struct netconn *client_conn;/*客户端连接*/
static uint8_t remot_addr[4] = {0}; /*远端ip数组*/
static u16_t port;/*远端端口*/
static ip_addr_t ipaddr;/*远端ip*/
static u8_t tcp_server_recvbuf[TCP_SERVER_RX_BUFSIZE] = {0};static void tcp_server_entity(void *args) {err_t err;conn = netconn_new(NETCONN_TCP);  //创建一个TCP链接netconn_bind(conn, IP_ADDR_ANY, 8080);  //绑定端口 8号端口netconn_listen(conn);        //进入监听模式conn->recv_timeout = 10;    //禁止阻塞线程 等待10msstruct netconn *cli_con;while (1) {begin_listen:err = netconn_accept(conn, &cli_con);  //接收连接请求if (err == ERR_OK) {cli_con->recv_timeout = 10;for (int i = 0; i < CLIENT_LIST_SIZE; ++i) {if (client_list[i].stat == 0) {netconn_getaddr(cli_con, &client_list[i].ip, &client_list[i].port, 0); //获取远端IP地址和端口号remot_addr[3] = (uint8_t) (client_list[i].ip.addr >> 24);remot_addr[2] = (uint8_t) (client_list[i].ip.addr >> 16);remot_addr[1] = (uint8_t) (client_list[i].ip.addr >> 8);remot_addr[0] = (uint8_t) (client_list[i].ip.addr);printf("主机%d.%d.%d.%d连接上服务器,主机端口号为:%d\r\n",remot_addr[0], remot_addr[1], remot_addr[2], remot_addr[3], client_list[i].port);client_list[i].stat = 1;client_list[i].conn = cli_con;goto begin_listen;}}/*释放链接*/netconn_close(cli_con);netconn_delete(cli_con);}vTaskDelay(10);}
}static void tcp_client_request_entity(void *args) {client_pcb *p_client;err_t err;u32_t data_len;while (1) {for (int i = 0; i < CLIENT_LIST_SIZE; ++i) {p_client = &client_list[i];if (p_client->stat == 1) {err = netconn_recv(p_client->conn, &p_client->net_buf);switch (err) {case ERR_OK: {portDISABLE_INTERRUPTS();memset(p_client->buf, 0, BUF_SIZE);  //数据接收缓冲区清零for (struct pbuf *q = p_client->net_buf->p; q != NULL; q = q->next)  //遍历完整个pbuf链表{if (q->len > (BUF_SIZE - data_len)) {/*数据超出缓冲区大小*/memcpy(p_client->buf + data_len, q->payload, BUF_SIZE - data_len);break;} else {memcpy(p_client->buf + data_len, q->payload, q->len);}data_len += q->len;if (data_len > BUF_SIZE) break;}portENABLE_INTERRUPTS();// todo 应用逻辑处理netconn_write(p_client->conn, p_client->buf, data_len, NETCONN_COPY);data_len = 0;  //复制完成后data_len要清零。netbuf_delete(p_client->net_buf);break;}case ERR_CLSD:case ERR_RST: {goto release_conn_tag;}default:if (g_lwipdev.link_status == LWIP_LINK_OFF) { /*判断网线是否连接正常*/printf("物理连线出现问题\r\n");goto release_conn_tag;}}continue;release_conn_tag: /*释放链接*/{netconn_close(p_client->conn);netconn_delete(p_client->conn);p_client->stat = 0;}}vTaskDelay(10);}}}#endif

测试结果