dual ethernet wiznet5500 esp32s3

[littlegreenbean33]

Hi,

I am trying to set up an esp32S3 with dual ethernet interfaces. My use case requires bridging at OSI7 level 2 different networks.

In the discord channel I have been sharing my experience ( and received help).
https://discord.com/channels/574275045187125269/1012726673709469818/1322641406573019269

I know IDF support more than one ethernet interface. I was just wondering if that functionality has been relayed into micropython ?

Any ideas ?

Currently both interfaces show different MAC addresses . However, same IP and IP connection details.....even when connected to 2 different routers with different ip ranges.

Regards

JC
(EDITED. system return different MACs still same IP configuration, connected to 2 separate routers)

[littlegreenbean33]

my notes above maybe incorrect. It looks like only one LAN interface is possible ?

[robert-hh]

Does it make a difference if you set the IP a dresses manually with ifconfig()?

[littlegreenbean33]

will try but

>>> lan1 is lan2 
True

spells for the wrong result.

[littlegreenbean33]

do you think I should open an bug report ?

I should be able to have multiple interfaces on the same medium. i.e. PPP I could have 3 IP over serial connections....

I can only understand may be related to this... ignorance is a bliss...

135     if (args[ARG_id].u_obj != mp_const_none) {
136         if (mp_obj_get_int(args[ARG_id].u_obj) != 0) {
137             mp_raise_ValueError(MP_ERROR_TEXT("invalid LAN interface identifier"));
138         }
139     }

in network_lan.c is supposed to rise an error if id != 0 ?? but that is not happening to me. I use 1 and 0.

[robert-hh]

Looking into the code I see, that the ESP32 port uses a static object for LAN. So yes, one can only have a single LAN interface. It may be possible to use a dynamic object instead, but for that the code must be changed (not a big deal) and tested. The tiny downside of that is, that dynamic objects get lost on soft reset.

[littlegreenbean33]

thanks @robert-hh. Can you point me to where in the code this is ? ...My C/Unix system programming is 25 years old...but I may entertain myself looking to see if there is anything I can do....if only testing in case somebody else takes the lead.

I'll open a feature request though.

Thanks for looking into this.

JC

[robert-hh]

The file is ports/esp32/network.lan.c. The LAN object is defined at line 48-64. It is instantiated at line 107, where the dynamic object would have to be assigned. Using something like:
self = mp_obj_malloc(lan_if_obj_t, &lan_if_type); and then setting it up accordingly.
But there is more to it, and especially the espressif stack must be able to handle more interfaces.

[littlegreenbean33]

@robert-hh idf does support multiple LAN. I checked before my tests. There is a patch late 2022, 2023 with the changes. I will look for it and share the link

[littlegreenbean33]

I decided to tes the dual port based on these comments

espressif/esp-idf#7318

espressif/esp-idf@ef30384