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wifimicropython

First WiFi connection in MicroPython fails on RP2040

I'm running MicroPython on my Raspberry Pi Pico and trying to connect it to my WiFi with the following code:

wifi = network.WLAN(network.STA_IF)
wifi.active(True)
print(wifi.isconnected())
wifi.connect('<<SSID>>', '<<Password>>')
print(wifi.isconnected())

When running this for the very first time after plugging the Raspi into my laptop, it fails:

False
False

When running it the next time, it succeeds for the first call of isconnected():

True
True

So I tried a loop like this:

wifi = network.WLAN(network.STA_IF)
wifi.active(True)
while not wifi.isconnected():
    print('WiFi not connected, trying to connect')
    wifi.connect('<<SSID>>', '<<Password>>')
    time.sleep(1)

But with this, I'm running into an infinite loop and the WiFi never succeeds. When checking my router, the Raspi seems to be properly connected.

Solution

  • It seems to be a timing issue, the following code is stable and works properly:

    pin = Pin("LED", Pin.OUT)
pin.off()

wifi = network.WLAN(network.STA_IF)
wifi.active(True)
time.sleep(2)
wifi.connect('<<SSID>>', '<<Password>>')
time.sleep(2)

max_wait = 10
while max_wait > 0:
    if wifi.status() < 0 or wifi.status() >= 3:
        break
    max_wait -= 1
    time.sleep(1)

if wifi.status() != 3:
    pin.on()
    raise RuntimeError('network connection failed')
else:
    pin.on()
    time.sleep(1)
    pin.off()