Multi-Ethernet via SocketPool class (thanks, @justin!)

code.py

import time
import traceback

import board
import busio
import digitalio
import adafruit_requests  # pre-CM pr post-PR10-CM needed with this code
from adafruit_wiznet5k.adafruit_wiznet5k import WIZNET5K
import adafruit_wiznet5k.adafruit_wiznet5k_socketpool as socketpool

TEXT_URL = "http://wifitest.adafruit.com/testwifi/index.html"

spi_bus = board.SPI()
cs_pins = (board.A3, board.A4, board.A5)
cs = []
radio = []
pool = []
requests = []
for i in range(0, len(cs_pins)):
    cs.append(digitalio.DigitalInOut(cs_pins[i]))
    mac = f'de:ad:be:ef:fe:{(64 + 17*i):02x}'
    radio.append(WIZNET5K(spi_bus, cs[i], mac=mac, debug=False))
    print(f'WIZnet {i} {mac} {radio[i].pretty_ip(radio[i].ip_address)}')
    pool.append(socketpool.SocketPool(radio[i]))
    requests.append(adafruit_requests.Session(pool[i]))

while True:
    for i in range(0, len(cs_pins)):
        try:
            with requests[i].get(TEXT_URL) as resp:
                print(resp.status_code, resp.reason.decode(), i, radio[i].pretty_ip(radio[i].ip_address))
        except Exception as ex:
            traceback.print_exception(ex, ex, ex.__traceback__)
        time.sleep(5)

Follow-on to https://gist.github.com/anecdata/c708dd9e5a0e0b582f01f27d24fc3aab using adafruit_wiznet5k PR#159