Checks

• I agree to follow the MicroPython Code of Conduct to ensure a safe and respectful space for everyone.

• I've searched for existing issues regarding this feature, and didn't find any.

Description

Working with boards with a wiznet ethernet interface, sometimes there isn't a DHCP server.
So, in this scenario, the interface is unusable.

It is easy to develop a zeroconf
implementation to auto assign a IP address without DHCP server.

Zeroconf checks if an IP address is in use (by other network peers) doing ARP requests.

Problem: the class WIZNET5K has the method send_ethernet but not a read_ethernet

I have written, pure python, two function:
arp_probe : about 40 lines
zeroconf : 13 lines

At the moment I can send ARP probes but not check the peers replies... so my zeroconf return a (random) IP address that theoretically can collide with other peers.

Are there other boards with a Ethernet interface that could benefit of zeroconf ?
Class WIZNET5K: if I wtore a PR to add read_ethernet, will the maintainers accept it ?

Code Size

I see in [network_wiznet5k.c(https://github.com/micropython/micropython/blob/30a9ccf4caa72c62cb8656a1572518fef34b08a4/extmod/network_wiznet5k.c#L248)
there are the two functions:

• wiznet5k_send_ethernet
• wiznet5k_recv_ethernet

wiznet5k_send_ethernet is already available to Python, see #15169

I think adding a wrapper also for wiznet5k_recv_ethernet will take few bytes.

Implementation

• I intend to implement this feature and would submit a Pull Request if desirable.
• I hope the MicroPython maintainers or community will implement this feature.
• I would like to Sponsor development of this feature.