ESP32 ETH no ETH.end / disable

[Typhoor]

I want do end or stop the ETH/ethernet component to conserve energy:

In ETH.H/CPP there is a begin method but no corressponding endmethod.
In the underlying Espressif esp-idf there is a esp_eth_start and a corresponding esp_eth_stop.

I'm using WT32_ETH01 and/or Olimex ESP32 POE mostly both are using the LAN 8720 PHY
Some have power pin some have not.

I observe that power raises from 60-80mA to 150mA when starting ETH (ethernet), but there is no way back.

Workaround so far is the set some static (flash/eeprom) markers and then reboot (not activating Ethernet).
But this disturbes the other working tasks...

[VojtechBartoska]

Hello @Typhoor, are you able to propose changes in PR?

[VojtechBartoska]

Looks related: #6188

[playmiel]

Hello, I have the same problem, I would like to disable the Ethernet but I can't find any way to do it, do you have an idea?

[aminzakizebarjad]

I think there is a way to do that
esp_eth_stop(ETH.eth_handle);

[playmiel]

it works but then impossible to restart the Ethernet because of the emac allocation

[Tarik2142]

https://github.com/espressif/esp-idf/blob/fcc43ef8ed8a4e03c3a795cb03ba560787254da6/components/esp_eth/test/test_emac.c#L193

[VojtechBartoska]

Hello, for version 3.0.0 Networking was refactored. Can you please give it a try?

I am for now closing this ticker as it is quite old, if needed, you can reopen it.

[hitecSmartHome]

When we call ETH.end() and immidiately call

ETH.begin(
        ETH_PHY_LAN8720,
        ETH8720_PHY_ADDR,
        SMI_MDC_PIN,
        SMI_MDIO_PIN,
        POWER_PIN,
        ETH_CLOCK_GPIO0_IN
    );

It fails to start with this message.

[190308][E][ETH.cpp:231] begin(): esp_eth_mac_new_esp32 failed

The reason we want to stop and start is to apply hostname and configured static ip changes.

[me-no-dev]

@hitecSmartHome here is the fix: #11048

[hitecSmartHome]

Thank you! Will check it out!