Getting netif

[maximkulkin]

ESP32 integrates with LWIP for network stack which has a "netif" data structure. Some LWIP functions take "struct netif *" as arguments. tcpip_adapter component manages netif structures and provides functions to manipulate them. It also has a enum - tcpip_adapter_if_t - to point to particular network interface. The problem is that there is no function to get "struct netif *" based on tcpip_adapter_if_t to pass it to LWIP functions. ESP8266 SDK had system_get_netif() function for that.

How can I get netif based on tcpip_adapter_if_t ?

[WiFive]

tcpip_adapter_get_netif

[JoeSensoric]

I found a netif-solution:

Code: Select all

esp_netif_t* netif=NULL;
netif = esp_netif_get_handle_from_ifkey("WIFI_STA_DEF");

For AP-mode the parameter is "WIFI_AP_DEF"

I found this in the component sources, the ifkey parameter is not really explained.

[vinimac]

Hi,

How do I set Wifi as default interface?

Code: Select all

void setWifidefault()
{
    esp_netif_t* netif = NULL;
    netif = esp_netif_get_handle_from_ifkey("WIFI_AP_DEF");
    netif_set_default(netif->lwip_netif);
}

error: dereferencing pointer to incomplete type 'esp_netif_t' {aka 'struct esp_netif_obj'}

[phatpaul]

I found a netif-solution:

Code: Select all

esp_netif_t* netif=NULL;
netif = esp_netif_get_handle_from_ifkey("WIFI_STA_DEF");

For AP-mode the parameter is "WIFI_AP_DEF"

I found this in the component sources, the ifkey parameter is not really explained.

Thanks for posting this, it's just what I was looking for! Not sure why it isn't used in any official examples.