Implement wifi.stop_ap for RP2

[eightycc]

Implement wifi.stop_ap() in RP2.

Resolves #8138.

[anecdata]

Using artifact Adafruit CircuitPython 8.2.7-6-g2aa5b443a7 on 2023-11-12; Raspberry Pi Pico W with rp2040:

LGTM, can start and stop AP, and alternate between Station and AP, repeatedly, without issue. Tested with and without Web Workflow enabled. Retested #8138 without issue.

import time
import os
import wifi

AP_SSID = "Bob"
AP_PASSWORD = "YourUncle"
ITERATIONS = 10
DELAY = 3

time.sleep(3)  # wait for serial
print("="*25)

def connect():
    while not wifi.radio.connected:
        try:
            wifi.radio.connect(os.getenv("WIFI_SSID"), os.getenv("WIFI_PASSWORD"))
        except:
            pass

def ap():
    print("Starting AP...      ", end="")
    wifi.radio.start_ap(ssid=AP_SSID, password=AP_PASSWORD)
    print(f"{wifi.radio.ipv4_address_ap=}")
    time.sleep(DELAY)
    print("Stopping AP...      ", end="")
    wifi.radio.stop_ap()
    print(f"{wifi.radio.ipv4_address_ap=}")

def station():
    print("Starting station...")
    wifi.radio.start_station()
    print("Connecting...       ", end="")
    connect()
    print(f"{wifi.radio.ipv4_address=}")
    time.sleep(DELAY)
    print("Stopping Station... ", end="")
    wifi.radio.stop_station()
    print(f"{wifi.radio.ipv4_address=}")

# start clean
if wifi.radio.connected or wifi.radio.ipv4_address:
    wifi.radio.stop_station()
if (wifi.radio.ap_active) or (wifi.radio.ipv4_address_ap):
    wifi.radio.stop_ap()
while True:
    print()
    # Station toggling
    for _ in range(0, ITERATIONS):
        station()
    # AP toggling
    for _ in range(0, ITERATIONS):
        ap()
    # Station & AP alternating
    for _ in range(0, ITERATIONS):
        station()
        ap()

Thanks, @eightycc!

[dhalbert]

@jepler asking for a review from you, given your expertise on this, but looks good.

[jepler]

thanks! no testing performed.