static void esp8266_get_netdev_info(struct rt_work *work, void *work_data)
{
#define AT_ADDR_LEN          32
#define AT_ERR_DNS_SERVER    "255.255.255.255"
#define AT_DEF_DNS_SERVER    "114.114.114.114"
​
    at_response_t resp = RT_NULL;
    char ip[AT_ADDR_LEN] = {0}, mac[AT_ADDR_LEN] = {0};
    char gateway[AT_ADDR_LEN] = {0}, netmask[AT_ADDR_LEN] = {0};
    char dns_server1[AT_ADDR_LEN] = {0}, dns_server2[AT_ADDR_LEN] = {0};
    const char *resp_expr = "%*[^\"]\"%[^\"]\"";
    const char *resp_dns = "+CIPDNS:1,%s";//
    ip_addr_t ip_addr;
    rt_uint32_t mac_addr[6] = {0};
    rt_uint32_t num = 0;
    rt_uint32_t dhcp_stat = 0;
    struct at_device *device = (struct at_device *)work_data;
    struct netdev *netdev = device->netdev;
    struct at_client *client = device->client;
​
    if (work != RT_NULL)
    {
        rt_free(work);
    }
​
    resp = at_create_resp(512, 0, rt_tick_from_millisecond(300));
    if (resp == RT_NULL)
    {
        LOG_E("no memory for resp create.");
        return;
    }
​
    /* send mac addr query commond "AT+CIFSR" and wait response */
    if (at_obj_exec_cmd(client, resp, "AT+CIFSR") < 0)
    {
        goto __exit;
    }
​
    if (at_resp_parse_line_args_by_kw(resp, "STAMAC", resp_expr, mac) <= 0)
    {
        LOG_E("%s device parse \"AT+CIFSR\" cmd error.", device->name);
        goto __exit;
    }
​
    /* send addr info query commond "AT+CIPSTA?" and wait response */
    if (at_obj_exec_cmd(client, resp, "AT+CIPSTA?") < 0)
    {
        LOG_E("%s device send \"AT+CIPSTA?\" cmd error.", device->name);
        goto __exit;
    }
​
    if (at_resp_parse_line_args_by_kw(resp, "ip", resp_expr, ip) <= 0 ||
            at_resp_parse_line_args_by_kw(resp, "gateway", resp_expr, gateway) <= 0 ||
            at_resp_parse_line_args_by_kw(resp, "netmask", resp_expr, netmask) <= 0)
    {
        LOG_E("%s device prase \"AT+CIPSTA?\" cmd error.", device->name);
        goto __exit;
    }
​
    /* set netdev info */
    inet_aton(gateway, &ip_addr);
    netdev_low_level_set_gw(netdev, &ip_addr);
    inet_aton(netmask, &ip_addr);
    netdev_low_level_set_netmask(netdev, &ip_addr);
    inet_aton(ip, &ip_addr);
    netdev_low_level_set_ipaddr(netdev, &ip_addr);
    sscanf(mac, "%x:%x:%x:%x:%x:%x",
            &mac_addr[0], &mac_addr[1], &mac_addr[2], &mac_addr[3], &mac_addr[4], &mac_addr[5]);
    for (num = 0; num < netdev->hwaddr_len; num++)
    {
        netdev->hwaddr[num] = mac_addr[num];
    }
​
    /* send dns server query commond "AT+CIPDNS?" and wait response */
    if (at_obj_exec_cmd(device->client, resp, "AT+CIPDNS?") < 0)
    {
        LOG_W("please check and update %s device firmware to support the \"AT+CIPDNS?\" cmd.", device->name);
        goto __exit;
    }
​
    if (at_resp_parse_line_args(resp, 1, resp_dns, dns_server1) <= 0 &&
            at_resp_parse_line_args(resp, 2, resp_dns, dns_server2) <= 0)
    {
        LOG_E("%d device prase \"AT+CIPDNS?\" cmd error.", device->name);
        goto __exit;
    }
​
    /* set primary DNS server address */
    if (rt_strlen(dns_server1) > 0 &&
            rt_strncmp(dns_server1, AT_ERR_DNS_SERVER, rt_strlen(AT_ERR_DNS_SERVER)) != 0)
    {
        //inet_aton(dns_server1, &ip_addr);
        if(inet_aton(dns_server1, &ip_addr) == 0)
        {
            sscanf(dns_server1,"\"%[^\"]\"",dns_server1);
            if(rt_strcmp(dns_server1,"8.8.8.8")==0)
            {
                inet_aton(dns_server1, &ip_addr);
            }
            else if(rt_strcmp(dns_server1,"\"8.8.8.8\"")==0)
            {
                inet_aton(dns_server1, &ip_addr);
            }
        }
        netdev_low_level_set_dns_server(netdev, 0, &ip_addr);
    }
    else
    {
        inet_aton(AT_DEF_DNS_SERVER, &ip_addr);
        esp8266_netdev_set_dns_server(netdev, 0, &ip_addr);
    }
​
    /* set secondary DNS server address */
    if (rt_strlen(dns_server2) > 0 )
    {
        inet_aton(dns_server2, &ip_addr);
        netdev_low_level_set_dns_server(netdev, 1, &ip_addr);
    }
​
    /* send DHCP query commond " AT+CWDHCP?" and wait response */
    if (at_obj_exec_cmd(client, resp, "AT+CWDHCP?") < 0)
    {
        goto __exit;
    }
​
    /* parse response data, get the DHCP status */
    if (at_resp_parse_line_args_by_kw(resp, "+CWDHCP:", "+CWDHCP:%d", &dhcp_stat) < 0)
    {
        LOG_E("%s device prase DHCP status error.", device->name);
        goto __exit;
    }
​
    /* Bit0 - SoftAP DHCP status, Bit1 - Station DHCP status */
    netdev_low_level_set_dhcp_status(netdev, dhcp_stat & 0x02 ? RT_TRUE : RT_FALSE);
​
__exit:
    if (resp)
    {
        at_delete_resp(resp);
    }
}