使用coap时device绑定问题

发布于 2019-11-26 13:05:46 浏览：988 订阅该版

```c
int at_bind(int socket, const struct sockaddr *name, socklen_t namelen)
{
    struct at_socket *sock = RT_NULL;
    struct at_device *device = RT_NULL;
    ip_addr_t input_ipaddr, local_ipaddr;
    uint16_t port = 0;

sock = at_get_socket(socket);
    if (sock == RT_NULL)
    {
        return -1;
    }

/* get current device ip address */
    device = (struct at_device *) sock->device;
    ip_addr_copy(local_ipaddr, device->netdev->ip_addr);

/* prase ip address and port from sockaddr structure */
    socketaddr_to_ipaddr_port(name, &input_ipaddr, &port);

/* input ip address is different from device ip address */
    if (ip_addr_cmp(&input_ipaddr, &local_ipaddr) == 0)
    {   
        struct at_socket *new_sock = RT_NULL;
        struct at_device *new_device = RT_NULL;
        enum at_socket_type type = sock->type;

/* close old socket */
        if (at_closesocket(socket) < 0)
        {
            return -1;
        }

extern struct at_device *at_device_get_by_ipaddr(ip_addr_t *ip_addr);
        new_device = at_device_get_by_ipaddr(&input_ipaddr);
        if (new_device == RT_NULL)
        {
            return -1;
        }

/* allocate new socket */
        new_sock = alloc_socket_by_device(new_device);
        if (new_sock == RT_NULL)
        {
            return -1;
        }
        new_sock->type = type;
        new_sock->state = AT_SOCKET_OPEN;
    }

return 0;
}
```

上面函数中
```c
ip_addr_copy(local_ipaddr, device->netdev->ip_addr); device->netdev->ip_addr
```
传过来的值为空，这是什么问题？

另外模组注网成功之后基站分配的IP是不是应该设置成device IP？