After restarting WiFi_Router, it does not assign a fixed IP address to the client. (AEGHB-266)

[bluestar714]

I am using wifi_router example. I have several client devices connected to wifi_router softap. When I reboot wifi_router, the client devices are rebooted, but they seem to be assigned different IP addresses than before.

I have the following settings in sdkconfig, but it appears that when I turn off the wifi_router, the IP address configuration information is also lost.

Are there any other settings I need to make?

• sdkconfig

  CONFIG_LWIP_DHCP_RESTORE_LAST_IP=y

esp-idf is using nvs, so I think I'm storing data in a non-volatile place.

• dhcp_ip_addr_store.c

void dhcp_ip_addr_store(struct netif *netif)
{
    nvs_handle_t nvs;
    char if_key[IF_KEY_SIZE];
    if (netif == NULL) {
        return;
    }
    struct dhcp *dhcp = netif_dhcp_data(netif);
    uint32_t ip_addr = dhcp->offered_ip_addr.addr;

    if (nvs_open(DHCP_NAMESPACE, NVS_READWRITE, &nvs) == ESP_OK) {
        nvs_set_u32(nvs, gen_if_key(netif, if_key), ip_addr);
        nvs_commit(nvs);
        nvs_close(nvs);
    }
}

[tswen]

Do you mean that "turning off the wifi_router" refers to restarting the wifi_router device? If the wifi_router device is restarted, the protocol stack will not retain the previously assigned IP addresses for the corresponding devices.

[bluestar714]

Thank you very much.

Do you mean that "turning off the wifi_router" refers to restarting the wifi_router device?

Yes, it is. I mean device reboot. I was expecting a fixed IP address to be assigned to each client with a fixed lease time, similar to a typical WiFi router.