Runtime configurable USB_DEVICE_NETWORK_ECM_MAC

[Hiihtaja77]

Looks like ECM MAC address is hardcoded and can't be changed during runtime.

zephyr/subsys/usb/device/class/netusb/function_ecm.c

Line 403 in 6063490

CONFIG_USB_DEVICE_NETWORK_ECM_MAC),

API
net_if_set_link_addr(iface_eth, "\x00\x00\x5e\x00\x53\xff", 6, NET_LINK_ETHERNET);

Can be used for native network interfaces but not for cases when Ethernet is mounted via a USB NET class.

USB descriptor can be made global and after that MAC address can be set online:

#if defined(CONFIG_USB_ECM_MAC)
uint8_t *ecm_mac_ptr = &utf16le_mac.bString[0];
endif
....
and in source code :
ecm_mac_ptr[20] = str[0];
ecm_mac_ptr[22] = str[1];

How to set ECM MAC address during runtime ?