wifi eth bridge idea

wifi-eth-bridge.c

#include <esp_private/wifi.h>
#include <netif/wlanif.h>
                                    
static esp_err_t tcpip_adapter_sta_input(void *buffer, uint16_t len, void *eb)
{
  if (destination_mac_address_belongs_to_eth) {
    esp_eth_tx(buffer, len);
    esp_wifi_internal_free_rx_buffer(eb);
    return ESP_OK;
  }
  // else
  if (is_broadcast) {
    esp_eth_tx(buffer, len);
  }
  wlanif_input(esp_netif[TCPIP_ADAPTER_IF_STA], buffer, len, eb);

  return ESP_OK;
}


static esp_err_t event_handler(void *ctx, system_event_t *event)
{
  switch(event->event_id) {
  case SYSTEM_EVENT_STA_START:
    esp_wifi_connect();
    break;
  case SYSTEM_EVENT_STA_CONNECTED:
    esp_wifi_internal_reg_rxcb(ESP_IF_WIFI_STA, (wifi_rxcb_t)tcpip_adapter_sta_input);
    break;
  case SYSTEM_EVENT_STA_DISCONNECTED:
    attempt_to_reconnect();
    break;
  default:
    break;
  }
  return ESP_OK;
}

void app_main()
{
  tcpip_adapter_init();
  esp_event_loop_init(event_handler, NULL);

  wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
  esp_wifi_init(&cfg);
  wifi_config_t wifi_config = {
    .sta = {
      .ssid = "MY_SSID",
      .password = "MY_PASSWORD"
    },
  };
  esp_wifi_set_mode(WIFI_MODE_STA);
  esp_wifi_set_config(ESP_IF_WIFI_STA, &wifi_config);
  esp_wifi_start();  
}