Does RIOT support ethernet physical layer?

Question

Setup:

1. Connect stm32f407vet6 and LAN8720, connect to ethernet

2. Code is here: https://github.com/RIOT-OS/RIOT/tree/master/examples/emcute_mqttsn

3. cd RIOT/examples/emcute_mqttsn

4. make BOARD=stm32f4discovery all flash term

5. With ifconfig , ethernet interface info not printed. Does RIOT support ethernet physical layer? Please see log:

> help
2019-05-30 17:23:32,578 - INFO #  help
2019-05-30 17:23:32,581 - INFO # Command              Description
2019-05-30 17:23:32,584 - INFO # ---------------------------------------
2019-05-30 17:23:32,587 - INFO # con                  connect to MQTT broker
2019-05-30 17:23:32,592 - INFO # discon               disconnect from the current broker
2019-05-30 17:23:32,595 - INFO # pub                  publish something
2019-05-30 17:23:32,598 - INFO # sub                  subscribe topic
2019-05-30 17:23:32,603 - INFO # unsub                unsubscribe from topic
2019-05-30 17:23:32,606 - INFO # will                 register a last will
2019-05-30 17:23:32,609 - INFO # reboot               Reboot the node
2019-05-30 17:23:32,615 - INFO # ps                   Prints information about running threads.
2019-05-30 17:23:32,617 - INFO # ping6                Ping via ICMPv6
2019-05-30 17:23:32,623 - INFO # random_init          initializes the PRNG
2019-05-30 17:23:32,628 - INFO # random_get           returns 32 bit of pseudo randomness
2019-05-30 17:23:32,632 - INFO # nib                  Configure neighbor information base
2019-05-30 17:23:32,637 - INFO # ifconfig             Configure network interfaces
> ifconfig
2019-05-30 17:23:36,554 - INFO #  ifconfig
> 

Answer 1

STM32 Ethernet is supported in RIOT since a month ago, but the board you specified (STM32F4Discovery) does not have an Ethernet interface, and thus the module for it is not enabled.

If your setup is similar to the discovery board, creating a board file for the stm32f407vet6 based on the discovery board and the nucleo-f767zi board that has support for STM32 Ethernet. It's not a great deal of work if you know your board, and the project would certainly appreciate a pull request with whatever you come up with.