Add Ethernet support to esp-idf

[nagyrobi]

Describe the problem you have/What new integration you would like
More and more Ethernet supporting boards are available these days.

• WT32-ETH01
• Olimex ESP32-POE/ISO, ESP32-EVB, ESP32-GATEWAY
• PRODINo ESP32 Ethernet
• TTGO T-Internet-POE ESP32
• wESP32
• OpenHacks LAN8720
• ESP32-Ethernet-Kit

Currently ESPHome only supports Ethernet under arduino platform (config example below for WT32-ETH01):

esphome:
  name: "Test"

esp32:
  board: esp32doit-devkit-v1
  framework:
    type: esp-idf

ethernet:
  type: LAN8720
  mdc_pin: GPIO23
  mdio_pin: GPIO18
  clk_mode: GPIO0_IN
  phy_addr: 1
  power_pin: GPIO16
  manual_ip:
    static_ip: 192.168.2.10
    gateway: 192.168.2.1
    subnet: 255.255.255.0
  use_address: 192.168.2.10

Results in error:

ethernet: [source /config/esphome/test.yaml:38]
  
  This feature is only available with frameworks ['arduino'].

Please describe your use case for this integration and alternatives you've tried:
Please add Ethernet support to esp-idf. Less memory consumption.

Additional context
N/A

[ma-lalonde]

1. How would one go about implementing this? Would it mostly be about copying the .h file and re-implementing the .cpp file?
2. How much work are we talking about, presumably?
3. What version of the IDF should be targeted? There are major changes in 5.0.0

[nagyrobi]

Don't think it's just that easy, as far as I understand Ethernet is heavily relying on what's already in arduino base. For IDF wheel has to be reinvented.

[tube0013]

Any type of timeline for when this could be implemented?

I'm looking to try the hardware flow for UART from #1126 (comment) but require Ethernet support (Olimex and WT32-ETH01)

[nagyrobi]

Done in: esphome/esphome#3564
Available from 2022.12 for LAN8720, RTL8201, DP83848, IP101 modules.