IP4_ADDR(&bp_gw, 192, 168, 137, 0);       /* input your gateway for example: 192.168.137.0 */
    IP4_ADDR(&bp_ipaddr, 192, 168, 137, 109); /* input your IP for example: 192.168.137.109 */
    IP4_ADDR(&bp_netmask, 255, 255, 255, 0);  /* input your netmask for example: 255.255.255.0 */

    // err_t netifapi_netif_set_addr(struct netif *netif,const ip4_addr_t *ipaddr,const ip4_addr_t *netmask,const ip4_addr_t *gw);
    err_t ret = netifapi_netif_set_addr(g_lwip_netif, &bp_ipaddr, &bp_netmask, &bp_netmask);
    if (ret != ERR_OK)
    {
        printf("netifapi_netif_set_addr Falied Error Code is %d.\r\n", ret);
        return -1;
    }
    printf("netifapi_netif_set_addr Succed!!!\r\n");

    // err_t netifapi_dhcps_start(struct netif *netif, char *start_ip, u16_t ip_num);
    ret = netifapi_dhcps_start(g_lwip_netif, 0, 0);
    if (ret != ERR_OK)
    {
        printf("netifapi_dhcps_start Falied Error Code is %d.\r\n", ret);
        return -1;
    }
    printf("netifapi_dhcps_start Succed!!!\r\n");
}