5 用AT组件实现HTTP-OTA,webclient是如何配合AT指令的？

发布于 2022-07-26 15:32:06 浏览：1018 订阅该版

lchnu 2022-07-26

Witness, Understand, Skill

杰瑞鼠 2022-07-26

2024龙行天下

lchnu 2022-07-26

Witness, Understand, Skill

杰瑞鼠 2022-07-27

2024龙行天下

lchnu 2022-07-27

Witness, Understand, Skill

以前写得玩儿的一段代码，在官方bing_test上做了一个简单修改，有两张网卡，esp32和sim7600。所以下方的代码中，都是使用AF_AT协议栈。你的是LwIP和AT，则需要分别对应AF_INET和AF_AT。

```c
#include <sys/socket.h>   /* 当需要操作网卡socket操作，需要包含这两个头文件 */
#include <sal_socket.h>

#define SERVER_HOST   "xx.xx.xx.xx"
#define SERVER_PORT   (xxxx)

static int bing_test(int argc, char **argv)
{
    struct sockaddr_in client_addr;
    struct sockaddr_in server_addr;
    struct netdev *netdev = RT_NULL;
    int sock_esp32 = -1;
    int sock_sim7600 = -1;

struct in_addr esp32_addr;
    struct in_addr sim7600ce_addr;

if (argc != 2)
    {
        rt_kprintf("bind_test [netdev_name]  --bind network interface device by name.\n");
        return -RT_ERROR;
    }

/* 通过名称获取 netdev 网卡对象 */
    netdev = netdev_get_by_name("esp32");
    if (netdev == RT_NULL)
    {
        rt_kprintf("get network interface device(%s) failed.\n", argv[1]);
        return -RT_ERROR;
    }
    /* 设置默认网卡对象 */
    netdev_set_default(netdev);

if ((sock_esp32 = socket(AF_AT, SOCK_STREAM, 0)) < 0)
    {
        rt_kprintf("Socket create failed.\n");
        return -RT_ERROR;
    }
    esp32_addr.s_addr = netdev->ip_addr.addr;

/* 初始化需要绑定的客户端地址 */
    client_addr.sin_family = AF_AT;
    client_addr.sin_port = htons(8080);
    /* 获取网卡对象中 IP 地址信息 */
    client_addr.sin_addr.s_addr = esp32_addr.s_addr;
    rt_memset(&(client_addr.sin_zero), 0, sizeof(client_addr.sin_zero));

if (bind(sock_esp32, (struct sockaddr *)&client_addr, sizeof(struct sockaddr)) < 0)
    {
        rt_kprintf("socket bind failed.\n");
        closesocket(sock_esp32);
        return -RT_ERROR;
    }
    rt_kprintf("socket bind network interface device(%s) success!\n", netdev->name);

netdev = netdev_get_by_name("sim7600ce");
     if (netdev == RT_NULL)
     {
         rt_kprintf("get network interface device(%s) failed.\n", argv[1]);
         return -RT_ERROR;
     }
     /* 设置默认网卡对象 */
     netdev_set_default(netdev);

if ((sock_sim7600 = socket(AF_AT, SOCK_STREAM, 0)) < 0)
     {
         rt_kprintf("Socket create failed.\n");
         return -RT_ERROR;
     }
     sim7600ce_addr.s_addr = netdev->ip_addr.addr;

/* 初始化需要绑定的客户端地址 */
     client_addr.sin_family = AF_AT;
     client_addr.sin_port = htons(8080);
     /* 获取网卡对象中 IP 地址信息 */
     client_addr.sin_addr.s_addr = sim7600ce_addr.s_addr;
     rt_memset(&(client_addr.sin_zero), 0, sizeof(client_addr.sin_zero));

if (bind(sock_sim7600, (struct sockaddr *)&client_addr, sizeof(struct sockaddr)) < 0)
     {
         rt_kprintf("socket bind failed.\n");
         closesocket(sock_sim7600);
         return -RT_ERROR;
     }
     rt_kprintf("socket bind network interface device(%s) success!\n", netdev->name);

/* 初始化预连接的服务端地址 */
    server_addr.sin_family = AF_AT;
    server_addr.sin_port = htons(SERVER_PORT);
    server_addr.sin_addr.s_addr = inet_addr(SERVER_HOST);
    rt_memset(&(server_addr.sin_zero), 0, sizeof(server_addr.sin_zero));

/* 连接到服务端 */
    if (connect(sock_esp32, (struct sockaddr *)&server_addr, sizeof(struct sockaddr)) < 0)
    {
        rt_kprintf("socket connect failed!\n");
        closesocket(sock_esp32);
        return -RT_ERROR;
    }
    else
    {
        rt_kprintf("socket connect success!\n");
    }

/* 连接到服务端 */
    if (connect(sock_sim7600, (struct sockaddr *)&server_addr, sizeof(struct sockaddr)) < 0)
    {
        rt_kprintf("socket connect failed!\n");
        closesocket(sock_sim7600);
        return -RT_ERROR;
    }
    else
    {
        rt_kprintf("socket connect success!\n");
    }

/* 关闭连接 */
    if (closesocket(sock_esp32) < 0 )
    {
        rt_kprintf("socket close failed!\n");
    }
    else
    {
        rt_kprintf("socket close success!\n");
    }

/* 关闭连接 */
    if (closesocket(sock_sim7600) < 0 )
    {
        rt_kprintf("socket close failed!\n");
    }
    else
    {
        rt_kprintf("socket close success!\n");
    }
    return RT_EOK;
}

#ifdef FINSH_USING_MSH
#include <finsh.h>
MSH_CMD_EXPORT(bing_test, bind network interface device test);
#endif /* FINSH_USING_MSH */
```

另外，这里关于多网卡还有不少好帖子：
https://club.rt-thread.org/ask/article/0f1cd91044f0fff2.html
https://blog.csdn.net/lzs940320/article/details/111637309

你也可以根据自己的实际需求，在论坛/百度搜索`RT-Thread 多网卡`，会有很多解决方案的。祝顺利！