OSError: no available NIC after Soft-Reset

[zmaier]

Hello,

i have a problem, hopefully you can help me.
After a soft-reset (CTRL-D in REPL), i get the error that there is no available NIC when using the urequest.post command. After a hard-reset everything is working fine.
Propably the re-initialization of the wifi interface is not done right, but the telnet-Repl is still alive?


boot.py:

Code: Select all

import machine
import os
from network import WLAN
import time
import pycom
import urequests

uart = machine.UART(0, baudrate=115200)
os.dupterm(uart)

wlan = WLAN()

if machine.reset_cause() != machine.SOFT_RESET:
  wlan.mode(WLAN.STA)
if wlan.isconnected():
  print('Already connected to WiFi network.')
else:
  wlan.connect(net_to_use.ssid, auth=(net_to_use.sec, pw), timeout=10000)
  while not wlan.isconnected():
     time.sleep_ms(500)
     print('.', end='')
print(' connected.')
machine.main('main.py')
 

main.py:

Code: Select all

while true:
  payload="status,volk={0} wert={1:0.2f} {2}".format(Volk_Nummer,Status,t)
  response = urequests.post(db, data=payload)
  time.sleep(20
  

[Lowe]

Hello,

i have a problem, hopefully you can help me.
After a soft-reset (CTRL-D in REPL), i get the error that there is no available NIC when using the urequest.post command. After a hard-reset everything is working fine.
Propably the re-initialization of the wifi interface is not done right, but the telnet-Repl is still alive?

boot.py:
import machine
import os
from network import WLAN
import time
import pycom
import urequests

uart = machine.UART(0, baudrate=115200)
os.dupterm(uart)

wlan = WLAN()

if machine.reset_cause() != machine.SOFT_RESET:
wlan.mode(WLAN.STA)
if wlan.isconnected():
print('Already connected to WiFi network.')
else:
wlan.connect(net_to_use.ssid, auth=(net_to_use.sec, pw), timeout=10000)
while not wlan.isconnected():
time.sleep_ms(500)
print('.', end='')
print(' connected.')
machine.main('main.py')

main.py:
while true:
payload="status,volk={0} wert={1:0.2f} {2}".format(Volk_Nummer,Status,t)
response = urequests.post(db, data=payload)
time.sleep(20

Facing similar issues here too. In need of help. Help is highly appreciated.

Thanks in advance,
Regards,
Lowe

___________________________________________________________________________________________________________
https://freejobalert.vip/ https://gimp.software/ https://notepad.software/

[Christian Walther]

Neither of you state what hardware you are using, so nobody can tell whether it’s something they are familiar with and could answer. You’d probably get a better chance at useful answers by posting in a board-specific forum rather than “General Discussion”.

[Roberthh]

@zmaier Why do you set wlan.mode() only on hard reset? It does not hurt to set it at any boot type.

[zmaier]

I am using a WiPy 3.0.

wlan.mode(WLAN.STA) at any boot type,
I read somewhere, that the connection (telnet repl) will get lost wenn setting the wlan-mode?

[Roberthh]

So you are using the PyCom WIPy3 with the PyCom firmware? Then better ask at the PyCom forum: forum.pycom.io