Arduino RP2040 connect wifi UDP - Multicast group not working

### CircuitPython version

```python
Adafruit 7.0 latest, and master branch (yeah I compiled master).

esp32 wifi chip:
Firmware vers. bytearray(b'1.4.8\x00')
```

### Code/REPL

```python
import time
import board
import busio
from digitalio import DigitalInOut
import adafruit_requests as requests
import adafruit_esp32spi.adafruit_esp32spi_socket as socket
from adafruit_esp32spi import adafruit_esp32spi
import neopixel
from rainbowio import colorwheel
import gc
from secrets import secrets

UDP_IN_ADDR="224.1.1.1"
UDP_IN_PORT = 5500

UDP_TIMEOUT = 20

esp32_cs = DigitalInOut(board.CS1)
esp32_ready = DigitalInOut(board.ESP_BUSY)
esp32_reset = DigitalInOut(board.ESP_RESET)

spi = busio.SPI(board.SCK1, board.MOSI1, board.MISO1)

esp = adafruit_esp32spi.ESP_SPIcontrol(spi, esp32_cs, esp32_ready, esp32_reset)
socket.set_interface(esp)

s_in = socket.socket(type=socket.SOCK_DGRAM)
s_in.settimeout(UDP_TIMEOUT)

if esp.status == adafruit_esp32spi.WL_IDLE_STATUS:
print("ESP32 found and in idle mode")
print("Firmware vers.", esp.firmware_version)
print("MAC addr:", [hex(i) for i in esp.MAC_address])
print("Connecting to AP...")
while not esp.is_connected:
try:
esp.connect_AP(secrets["ssid"], secrets["password"])
except RuntimeError as e:
print("could not connect to AP, retrying: ", e)
continue
print("Connected to", str(esp.ssid, "utf-8"), "\tRSSI:", esp.rssi)
#esp.ifconfig = (IP_ADDRESS, SUBNET_MASK, GATEWAY_ADDRESS, DNS_SERVER)
time.sleep(1)
IP_ADDR = esp.pretty_ip(esp.ip_address)
print("ip:", esp.ip_address)
print("My IP address is", esp.pretty_ip(esp.ip_address))
print("udp in addr: ", UDP_IN_ADDR, UDP_IN_PORT)

socketaddr_udp_in = socket.getaddrinfo(UDP_IN_ADDR, UDP_IN_PORT)[0][4]
s_in.connect(socketaddr_udp_in, conntype=esp.UDP_MODE)
print("connected local UDP")

while True:
data = s_in.recv(1205)
if len(data)>=1:
data=data.decode('utf-8')
print(len(data), data)

Python on Ubuntu:
# Untitled - By: svein - fre. okt. 15 2021

import socket
import time

def run(group, port):
MULTICAST_TTL = 40
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
sock.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, MULTICAST_TTL)
sock.sendto(b'from multicast_send.py: ' +
f'group: {group}, port: {port}'.encode(), (group, port))
if __name__ == '__main__':
while True:
#run('224.1.1.1', 5500)
run('192.168.2.147', 5500)
time.sleep(1)
```

### Behavior

ESP32 found and in idle mode
Firmware vers. bytearray(b'1.4.8\x00')
MAC addr: ['0xd0', '0xb1', '0x78', '0xa8', '0xcc', '0x84']
Connecting to AP...
Connected to zone RSSI: -47
ip: bytearray(b'\xc0\xa8\x02\x93')
My IP address is 192.168.2.147
udp in addr: 224.1.1.1 5500
connected local UDP
-->>> NO PACKETS recieved

ESP32 found and in idle mode
Firmware vers. bytearray(b'1.4.8\x00')
MAC addr: ['0xd0', '0xb1', '0x78', '0xa8', '0xcc', '0x84']
Connecting to AP...
Connected to zone RSSI: -47
ip: bytearray(b'\xc0\xa8\x02\x93')
My IP address is 192.168.2.147
udp in addr: 192.168.2.147 5500
connected local UDP
56 from multicast_send.py: group: 192.168.2.147, port: 5500
56 from multicast_send.py: group: 192.168.2.147, port: 5500
56 from multicast_send.py: group: 192.168.2.147, port: 5500
56 from multicast_send.py: group: 192.168.2.147, port: 5500

### Description

So Ive been testing the wifi part of the circuitpython on the Arduino rp2040 connect.
The circuitpython esp32 wifi integration doesnt allow to set a static IP (Im gonna make a separate bug report on this), and I want to be able to communicate with the rp2040 chip through wifi and send datapackets, but since I dont know the IP adress, I figured I could send a multicast IP instead. On my ubuntu, I do recieve these packages on same multicast IP and port. so the router is out of the question.(As I made a multicast data logger from my rp2040 chip to get debug data from it).

The UDP reciever works with the IP adress of the wifi chip eg. 192.168.2.147:5500, but NOT the multicast adress 224.1.1.1:5500.

I hope you guys can fix this.. and the dhcp=True/False issue aswell.

### Additional information

_No response_

Start with the CircuitPython and Ubuntu UDP reproduction in the issue, then trace the ESP32SPI socket handling for multicast addresses. Done means packets sent to 224.1.1.1:5500 are received by the Arduino RP2040 Connect while unicast UDP continues to work.

Written by the indexing model from the issue text.