- The third parameter (which is of type ``void *``) would accept an ``int``/``bool`` type arguments (i.e., not pointers) as input in some cases. However, these cases were not documented properly.
- To pass ``int``/``bool`` type argument as the third parameter, the argument had to be "unnaturally" casted to a ``void *`` type, to prevent a compiler warning as demonstrated in the code snippet below. This casting could lead to misuse of the :cpp:func:`esp_eth_ioctl` function.
Therefore, the usage of :cpp:func:`esp_eth_ioctl` is now unified. Arguments to the third parameter must be passed as pointers to a specific data type to/from where data will be stored/read by :cpp:func:`esp_eth_ioctl`. The code snippets below demonstrate the usage of :cpp:func:`esp_eth_ioctl`.
The KSZ8041/81 and LAN8720 drivers are updated to support more devices (i.e., generations) from their associated product families. The drivers can recognize particular chip numbers and their potential support by the driver.
``esp_eth_set_default_handlers()`` and ``esp_eth_clear_default_handlers()`` functions are removed. Registration of the default IP layer handlers for Ethernet is now handled automatically. If you have already followed the suggestion to fully initialize the Ethernet driver and network interface before registering their Ethernet/IP event handlers, then no action is required (except for deleting the affected functions). Otherwise, you may start the Ethernet driver right after they register the user event handler.
The Ethernet PHY address auto-detect function ``esp_eth_detect_phy_addr()`` is renamed to :cpp:func:`esp_eth_phy_802_3_detect_phy_addr` and its header declaration is moved to :component_file:`esp_eth/include/esp_eth_phy_802_3.h`.
The SPI-Ethernet Module initialization is now simplified. Previously, you had to manually allocate an SPI device using :cpp:func:`spi_bus_add_device` before instantiating the SPI-Ethernet MAC.
Now, you no longer need to call :cpp:func:`spi_bus_add_device` as SPI devices are allocated internally. As a result, the :cpp:class:`eth_dm9051_config_t`, :cpp:class:`eth_w5500_config_t`, and :cpp:class:`eth_ksz8851snl_config_t` configuration structures are updated to include members for SPI device configuration (e.g., to allow fine tuning of SPI timing which may be dependent on PCB design). Likewise, the ``ETH_DM9051_DEFAULT_CONFIG``, ``ETH_W5500_DEFAULT_CONFIG``, and ``ETH_KSZ8851SNL_DEFAULT_CONFIG`` configuration initialization macros are updated to accept new input parameters. Refer to :doc:`Ethernet API Reference Guide<../../api-reference/network/esp_eth>` for an example of SPI-Ethernet Module initialization.
The TCP/IP Adapter was a network interface abstraction component used in ESP-IDF prior to v4.1. This section outlines migration from tcpip_adapter API to its successor :doc:`/api-reference/network/esp_netif`.
- You may simply replace ``tcpip_adapter_init()`` with ``esp_netif_init()``. However, please should note that the ``esp_netif_init()`` function now returns standard error codes. See :doc:`/api-reference/network/esp_netif` for more details.
- The ``esp_netif_deinit()`` function is provided to de-initialize the network stack.
- You should also replace ``#include "tcpip_adapter.h"`` with ``#include "esp_netif.h"``.
This now changes. Network interface instance should be explicitly constructed, so that the :doc:`/api-reference/network/esp_netif` can connect to the TCP/IP stack. For example, after the TCP/IP stack and the event loop are initialized, the initialization code for WiFi must explicitly call ``esp_netif_create_default_wifi_sta();`` or ``esp_netif_create_default_wifi_ap();``.
Please refer to the example initialization code for these three interfaces:
Event handlers are moved from tcpip_adapter to appropriate driver code. There is no change from application code perspective, as all events should be handled in the same way. Please note that for IP-related event handlers, application code usually receives IP addresses in the form of an esp-netif specific struct instead of the LwIP structs. However, both structs are binary compatible.
Since ``ip4addr_ntoa()`` is a LwIP API, the esp-netif provides ``esp_ip4addr_ntoa()`` as a replacement. However, the above method using ``IP2STR()`` is generally preferred.
To port an application which may fully benefit from the :doc:`/api-reference/network/esp_netif`, you also need to disable the tcpip_adapter compatibility layer in the component configuration option. Please go to ``ESP NETIF Adapter`` > ``Enable backward compatible tcpip_adapter interface``. After that, check if your project compiles.
The TCP/IP adapter includes many dependencies. Thus, disabling its compatibility might help separate the application from using specific TCP/IP stack API directly.
