OSError: [Errno 202] EAI_FAIL

Reply to OSError: [Errno 202] EAI_FAIL on Tue, 26 Jan 2021 15:11:50 GMT

Jean Bikie — Tue, 26 Jan 2021 15:11:50 GMT

Hi
i'm trying to use the urequests module that i found here : https://github.com/micropython/micropython-lib/blob/master/urequests/urequests.py
but i've got an error :

In the MAIN.py i use a firebase module where all starts

the FIREBASE.py file

the UREQUEST file

Reply to OSError: [Errno 202] EAI_FAIL on Tue, 26 Jan 2021 17:10:55 GMT

Gijs — Tue, 26 Jan 2021 17:10:55 GMT

The EAI_FAIL is related to not being able to resolve the DNS. This means that, for whichever network you are using, the nameserver (like google.com) cannot be resolved to an IP address because the DNS server cannot be reached. This is thus related to the network not being connected to the internet, or the DNS server is not set correctly.

If you are using a pycom vodafone simcard over a NB-IoT connection, this is an expected result, as the simcards are only meant for connections to pybytes.

You can check the DNS server setting through using import socket; socket.dnsserver()

Let me know
Gijs

Reply to OSError: [Errno 202] EAI_FAIL on Tue, 26 Jan 2021 17:28:39 GMT

Jean Bikie — Tue, 26 Jan 2021 17:28:39 GMT

I don't use pycom vodafone.
i'm working with the wipy3 and i connect it to internet through the wifi.

i'm going to check the DNS server
i'll come back

Reply to OSError: [Errno 202] EAI_FAIL on Tue, 26 Jan 2021 20:59:04 GMT

Jean Bikie — Tue, 26 Jan 2021 20:59:04 GMT

I found the problem, it was because i tried the urequest without connected to WIFI but i don't understand because i wrote the connection code on the boot.py butt it only works when i write the connection code on the main.py
it's not normal , i think

Reply to OSError: [Errno 202] EAI_FAIL on Wed, 27 Jan 2021 10:16:04 GMT

Gijs — Wed, 27 Jan 2021 10:16:04 GMT

Do you wait in the boot.py until the connection is established, or simply use wlan.connect(...) and then end the file?
As far as I know, the statement you mention should be true, and the connection you made in the boot.py file should hold.
You should be able to test this though, through using

from network import WLAN
wlan = WLAN()
print(wlan.isconnected())

in the main.py to test if we are connected to a wifi network. If this returns false, there is no connection. This should also hold True if the connection was created in previous 'session' that you ctrl+c'd out of, which is, to my understanding, very similar to the transfer between boot.py and main.py.