Description

As per Micropython documentation it is possible to have (at least) 2 LAN ports.

https://docs.micropython.org/en/v1.24.0/library/network.LAN.html#network.LAN
id is the number of the Ethernet port, either 0 or 1.

However, in the esp32 port the LAN object is implemented as a static object.
As per @robert-hh this requires convert this object into a dynamic object and the effort would not be substantial. It's unlikely I can pitch in development, but I may be able to help testing.

Code Size

My use case is in bridging 2 networks that for security reason ( or other reasons ), need to remains isolated ( at level 2/3 ISO layers). No ethernet packets or IP packets between networks. However, it is OK to exchange data at application layer on verified appliances.

This case is frequent in industrial setups, where multiple networks are isolated but frequently there is need to exchange information between them. The simplest case if between devices isolated in network due to lack of security compliance and the rest of IT infra. Think an old robot still using Windows X that cost millions to replace. Or an old automation system, a third party system that cannot be audited/patched.

Bandwidth is not an issue frequently in these systems, either wise bare metal programing is required.

This is the code I have been testing on a ESP module prog 1

mport network, time, urequests
from machine import Pin, SPI,reset
import socket

a = False
#if a :
spi1 = SPI(1, miso=Pin(12), mosi=Pin(13), sck=Pin(14))
#spi.write(b'\x00\x39\x00')
#print(spi.read(1))
lan1 = network.LAN(0,phy_type=network.PHY_W5500, phy_addr=0, cs=Pin(15), int=Pin(11), spi=spi1)
lan1.config(mac=b"\x02\x00\x00\x12\x34\x56")
lan1.active(1)
time.sleep(1)
while lan1.status() != network.ETH_GOT_IP:
    print(".", end="")
    time.sleep(1)
print(f" {lan1.ipconfig('addr4')}, {network.ipconfig('dns')}") 
print(f" {lan1.ifconfig()}")
#else:
spi2 = SPI(2, miso=Pin(47), mosi=Pin(21), sck=Pin(18))
#spi.write(b'\x00\x39\x00')
#print(spi.read(1))
lan2 = network.LAN(1,phy_type=network.PHY_W5500, phy_addr=1, cs=Pin(16), int=Pin(17), spi=spi2)
lan2.config(mac=b"\x02\x00\x00\x12\x34\x57")
lan2.active(1)
time.sleep(1)
while lan2.status() != network.ETH_GOT_IP:
    print(".", end="")
    time.sleep(1)
print(f" {lan2.ipconfig('addr4')}, {network.ipconfig('dns')}") 
print(f" {lan2.ifconfig()}")

With the net results of

lan1 is lan2 
>>>True

Implementation

I hope the MicroPython maintainers or community will implement this feature

Code of Conduct

Yes, I agree