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ESP32 Ethernet: How to get current link speed

This is how you can get the current link speed of an Ethernet connection on the ESP32 using the ESP-IDF framework.

#include <esp_eth.h>

// Get link speed
eth_speed_t link_speed;
if (esp_eth_ioctl(eth_handle, ETH_CMD_G_SPEED, &link_speed) == ESP_OK) {
    const char* speed_str = (link_speed == ETH_SPEED_10M) ? "10 Mbps" : 
                          (link_speed == ETH_SPEED_100M) ? "100 Mbps" : "1000 Mbps";
    ESP_LOGI(TAG, "Ethernet Speed: %s", speed_str);
}