OSError: no network card available after newest firmware update

[Zino Henderickx]

Hello everyone,

I updated my latest firmware from the Pycom Lopy 4 (v.1.20.2.r4) and since ever then I can't send data over WiFi and I also can't change from protocol because it is for a task at the University.

This is my main code:

from machine import Pin
from time import sleep_ms
import time
import urequests

btn = Pin('P16', Pin.IN, Pin.PULL_UP)
btn2 = Pin('P17', Pin.IN, Pin.PULL_UP)
btn3 = Pin('P18', Pin.IN, Pin.PULL_UP)
btn4 = Pin('P19', Pin.IN, Pin.PULL_UP)

led = Pin('P20', Pin.OUT, Pin.PULL_DOWN)

def irq_function_sad(self):
    if not btn.value():
        led.value(1)
        print("ongelukkig")
        sleep_ms(500)
        send_sad("ongelukkig")
    else:
        led.value(0)


def send_sad(sad):
    res = urequests.post('http://xxxxxx', json={"emotie": sad})
    res.close()
    if (res.status_code - 200) < 100: # check that response code is in the 200 range
        print('done')
    else:
        print('there was some error')


def main():
    btn.callback(Pin.IRQ_FALLING, irq_function_sad)
    while True:
        print(btn.value())
        time.sleep(2)


if __name__ == "__main__":
    main()

My error:

Unhandled exception in callback handler
Traceback (most recent call last):
  File "main.py", line 18, in irq_function_sad
  File "main.py", line 24, in send_sad
  File "/flash/lib/urequests.py", line 116, in post
  File "/flash/lib/urequests.py", line 56, in request
OSError: Network card not available

Can someone help me please? Or did someone had the same problem?

Kind regards,

Zino

[Gijs]

It seems you never instantiate a network. Perhaps in 1.18 you were using the pycom.wifi_on_boot (etc. from here: https://docs.pycom.io/firmwareapi/pycom/pycom/#pycomwifi_on_bootboolean) settings which might have been erased when you did the firmware update?
In any case, you should be able to add the example from here: https://docs.pycom.io/tutorials/networks/wlan/#connecting-to-a-router to your main() to resolve the issue.