MDF_EVENT_MWIFI_ROOT_GOT_IP event does not occur on root device

[PavelLot]

Environment

• Development Kit: [ESP32-DevKitC]
• Kit version (for WroverKit/PicoKit/DevKitC): [v4]
• Core (if using chip or module): [ESP-WROOM-32U]
• MDF version (git rev-parse --short HEAD to get the commit id.): 1c76187
• Development Env: [Eclipse]
• Operating System: [Windows]
• Power Supply: [USB]

Problem Description

I found that sometimes when the root device goes offline, someone from the other child nodes on the network becomes the root node, but the MDF_EVENT_MWIFI_ROOT_GOT_IP event does not occur.
In this case, the esp_mesh_is_root method returns true.
Could there be conditions under which such behavior is possible?

[aresstokrat]

I also have such a problem. Sometimes after voting is done ROOT does't get IP.
I tried different routers, but problem still occur.

How can i debug this problem to find a solution?

[ravi-kashi]

I face the same issue. Has this been worked up on? I don't know why this is not working and the ticket is closed?

git rev-parse --short HEAD 
cf50274 

I found this in sdkconfig
CONFIG_MWIFI_WAIVE_ROOT=y

I found this in mwifi.c

#ifdef CONFIG_MWIFI_WAIVE_ROOT

        case IP_EVENT_STA_GOT_IP: {
            mwifi_waive_root_timer_delete();
            mwifi_waive_root_timer_create();
            mdf_event_loop_send(MDF_EVENT_MWIFI_ROOT_GOT_IP, &s_event_info);
            break;
        }

#endif /**< CONFIG_MWIFI_WAIVE_ROOT */

[shenjun7]

Please update the following api, we will merge to the release version.
esp_err_t esp_netif_create_default_wifi_mesh_netifs(esp_netif_t **p_netif_sta, esp_netif_t **p_netif_ap)
{
// Create "almost" default AP, with un-flagged DHCP server
esp_netif_inherent_config_t netif_cfg;
memcpy(&netif_cfg, ESP_NETIF_BASE_DEFAULT_WIFI_AP, sizeof(netif_cfg));
netif_cfg.flags &= ~ESP_NETIF_DHCP_SERVER;
esp_netif_config_t cfg_ap = {
.base = &netif_cfg,
.stack = ESP_NETIF_NETSTACK_DEFAULT_WIFI_AP,
};
esp_netif_t *netif_ap = esp_netif_new(&cfg_ap);
assert(netif_ap);
ESP_ERROR_CHECK(esp_netif_attach_wifi_ap(netif_ap));
ESP_ERROR_CHECK(esp_wifi_set_default_wifi_ap_handlers());

// ...and stop DHCP server to be compatible with former tcpip_adapter (to keep the ESP_NETIF_DHCP_STOPPED state)
ESP_ERROR_CHECK(esp_netif_dhcps_stop(netif_ap));

// Create "almost" default station, but with un-flagged DHCP client
memcpy(&netif_cfg, ESP_NETIF_BASE_DEFAULT_WIFI_STA, sizeof(netif_cfg));
// netif_cfg.flags &= ~ESP_NETIF_DHCP_CLIENT;
esp_netif_config_t cfg_sta = {
        .base = &netif_cfg,
        .stack = ESP_NETIF_NETSTACK_DEFAULT_WIFI_STA,
};
esp_netif_t *netif_sta = esp_netif_new(&cfg_sta);
assert(netif_sta);
ESP_ERROR_CHECK(esp_netif_attach_wifi_station(netif_sta));
ESP_ERROR_CHECK(esp_wifi_set_default_wifi_sta_handlers());

// ...and stop DHCP client (to be started separately if the station were promoted to root)
ESP_ERROR_CHECK(esp_netif_dhcpc_stop(netif_sta));

if (p_netif_sta) {
    *p_netif_sta = netif_sta;
}
if (p_netif_ap) {
    *p_netif_ap = netif_ap;
}
return ESP_OK;

}

[ravi-kashi]

Thank you Shenjun7.

the only difference is // netif_cfg.flags &= ~ESP_NETIF_DHCP_CLIENT;
I now get a different error and even now the root task is not created.
E (9466) esp_netif_handlers: invalid static ip

[shenjun7]

This error does not affect the acquisition of ip. You can add esp_netif_dhcpc_stop(sta_netif) after the MDF_EVENT_MWIFI_PARENT_CONNECTED, and revert the above change.

    case MDF_EVENT_MWIFI_PARENT_CONNECTED:
        MDF_LOGI("Parent is connected on station interface");

        if (esp_mesh_is_root()) {
            esp_netif_dhcpc_stop(sta_netif);
            esp_netif_dhcpc_start(sta_netif);
        }

[ravi-kashi]

Thank you Shenjun7.
I made these changes and it is working. I also removed the

esp_netif_dhcpc_stop(sta_netif);

and checked. It is working all right. Appreciate the help!

[xinort]

Thank you Shenjun7. I made these changes and it is working. I also removed the

esp_netif_dhcpc_stop(sta_netif);

and checked. It is working all right. Appreciate the help!

@ravi-kashi Hi, can you explain the changes you made? I'm experiencing this issue and the instructions from @shenjun7 aren't clear to me what changes need to be made in what file(s).

[piro-pp]

Thank you Shenjun7. I made these changes and it is working. I also removed the
esp_netif_dhcpc_stop(sta_netif);
and checked. It is working all right. Appreciate the help!

@ravi-kashi Hi, can you explain the changes you made? I'm experiencing this issue and the instructions from @shenjun7 aren't clear to me what changes need to be made in what file(s).

It's the file esp-idf/components/esp_wifi/src/wifi_default.c around line 385. The only change is to outcomment the line "netif_cfg.flags &= ~ESP_NETIF_DHCP_CLIENT;"