Can't connect on Raspberry Pi (Jessie)

Question

Can't connect on Raspberry Pi (Jessie)

Grandpa-G opened this issue 8 years ago · comments

I am using wifi class in python (indentation not showing here, changed password).

for cell in wifiList:
if 'RGC' in cell.ssid:
scheme = Scheme.for_cell('wlan0', 'gateway', cell, 'xFarm')
scheme.save()
print 'saved'
print('Connecting to %s' % cell.ssid)
try:
scheme.activate()
print 'Connect'
except:
print 'Connection failed'
break

When it gets to activate, the pi disconnects my xrdp session, can't be pinged, and I have to restart it to get another wifi connection by default reboot.

my interfaces file at the end looks like:

iface wlan0-gateway inet dhcp
wpa-psk bfa650e4fea5f81ff34e051b6e13e3e94398b90000d1735cfc3f40c3532afde5
wpa-ssid RGC
wireless-channel auto

The normal connection wifi entry is

iface wlan0 inet manual
wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

Am I doing something wrong? Does the wpa_supplicant.conf format still work with your scheme format? Ideas?

Rocky Meza · Answer 1 · Wed May 11 2016 23:45:04 GMT+0800 (China Standard Time)

You can do this to see what wifi is calling out to.

scheme = # ...
print(' '.join(['/sbin/ifup'] + self.as_args()))

Then you can run that command manually. Then can you post that output here?

Thanks,

Robert · Answer 2 · Fri May 13 2016 18:53:42 GMT+0800 (China Standard Time)

I am no longer using wifi

nox1203 · Answer 3 · Mon Jul 11 2016 06:31:48 GMT+0800 (China Standard Time)

On fully updated Jessie I run the following code after boot:

from wifi import Cell, Scheme

for scheme in Scheme.all():
    scheme.delete()
cell = Cell.all("wlan0")[0]
scheme = Scheme.for_cell('wlan0', "nox1203", cell, passkey="pass")
scheme.save()
scheme.activate()

and get the following:

Traceback (most recent call last):
  File "test.py", line 8, in <module>
    scheme.activate()
  File "/usr/local/lib/python2.7/dist-packages/wifi/scheme.py", line 176, in activate
    return self.parse_ifup_output(ifup_output)
  File "/usr/local/lib/python2.7/dist-packages/wifi/scheme.py", line 183, in parse_ifup_output
    raise ConnectionError("Failed to connect to %r" % self)
wifi.exceptions.ConnectionError: Failed to connect to Scheme(interface='wlan0', name='nox1203', options={'wpa-psk': 'fdd89aca0489ddf5b88286c495371ecd695b1b341a3d1263f90e34277f02852a', 'wpa-ssid': u'nox1203', 'wireless-channel': 'auto'}

But if I run the same code one more time it connects to the wifi.
Please request additional data if needed.

Rocky Meza · Answer 4 · Wed Jul 13 2016 06:17:19 GMT+0800 (China Standard Time)

hmm, that's weird.

Can you do this:

scheme = # ...
print(' '.join(['/sbin/ifup'] + self.as_args()))

and paste the output here?

Thanks,

nox1203 · Answer 5 · Fri Jul 15 2016 04:40:05 GMT+0800 (China Standard Time)

Added print statement.
I changed self.as_args() to scheme.as_args().
I got this:

/sbin/ifup wlan0=wlan0-nox1203 -o wpa-psk=fdd89aca0489ddf5b88286c495371ecd695b1b341a3d1263f90e34277f02852a -o wpa-ssid=nox1203 -o wireless-channel=auto

It is identical on both runs.

Rocky Meza · Answer 6 · Fri Jul 15 2016 05:36:40 GMT+0800 (China Standard Time)

Can you try running that command directly and post the output here?

On Fri, Jul 15, 2016 at 4:40 AM nox1203 notifications@github.com wrote:

Added print statement.
I changed self.as_args() to scheme.as_args().
I got this:

/sbin/ifup wlan0=wlan0-nox1203 -o
wpa-psk=fdd89aca0489ddf5b88286c495371ecd695b1b341a3d1263f90e34277f02852a -o
wpa-ssid=nox1203 -o wireless-channel=auto

It is identical on both runs.

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nox1203 · Answer 7 · Fri Jul 15 2016 05:57:43 GMT+0800 (China Standard Time)

pi@raspberrypi:~ $ sudo /sbin/ifup wlan0=wlan0-nox1203 -o wpa-psk=fdd89aca0489ddf5b88286c495371ecd695b1b341a3d1263f90e34277f02852a -o wpa-ssid=nox1203 -o wireless-channel=auto
/sbin/ifup: interface wlan0 already configured

ifconfig says:
wlan0 Link encap:Ethernet HWaddr 00:c1:41:31:0b:b3
inet6 addr: fe80::15ca:99a6:a787:2c0f/64 Scope:Link
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

Rocky Meza · Answer 8 · Fri Jul 15 2016 05:59:33 GMT+0800 (China Standard Time)

oh, you were already connected. Can you disconnect and then run this command?

nox1203 · Answer 9 · Fri Jul 15 2016 06:01:49 GMT+0800 (China Standard Time)

I was not connected. There is no inet ip for wlan.
nmap 192.168.1.* does not give anything for raspberry pi.

Rocky Meza · Answer 10 · Fri Jul 15 2016 06:03:59 GMT+0800 (China Standard Time)

oh sorry, I mean, your interface was already up. Can you turn off the
interface first? /sbin/ifdown wlan0

On Fri, Jul 15, 2016 at 6:01 AM nox1203 notifications@github.com wrote:

I was not connected. There is no inet ip for wlan.
nmap 192.168.1.* does not give anything for raspberry pi.

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nox1203 · Answer 11 · Fri Jul 15 2016 06:05:18 GMT+0800 (China Standard Time)

pi@raspberrypi:~ $ sudo /sbin/ifdown wlan0
pi@raspberrypi:~ $ sudo /sbin/ifup wlan0=wlan0-nox1203 -o wpa-psk=fdd89aca0489ddf5b88286c495371ecd695b1b341a3d1263f90e34277f02852a -o wpa-ssid=nox1203 -o wireless-channel=auto
Internet Systems Consortium DHCP Client 4.3.1
Copyright 2004-2014 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/wlan0/00:c1:41:31:0b:b3
Sending on LPF/wlan0/00:c1:41:31:0b:b3
Sending on Socket/fallback
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 4
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 10
DHCPREQUEST on wlan0 to 255.255.255.255 port 67
DHCPOFFER from 192.168.1.1
DHCPACK from 192.168.1.1
bound to 192.168.1.109 -- renewal in 34477 seconds.

Ashwin Prasad · Answer 12 · Mon Nov 28 2016 10:04:29 GMT+0800 (China Standard Time)

I'm having a similar issue, I need to run the command 2-3 times before it connects to the network. Any fixes for this? I'm on Jessie too

Pavel Sokolov · Answer 13 · Thu Mar 09 2017 09:01:54 GMT+0800 (China Standard Time)

Hi, rockymeza!
Few days ago I found and tried to use your library at the Raspberry Pi and got same issue.
As you recomended, I added line:

   print subprocess.check_output(["ifdown", IF_WLAN])

before call to activate() and it looks like now I get successful connection.

And few details probably will be useful for you:

in my script I also save current schema before connect to any other AP, and at the end I reconnect back to it and DO NOT use ifdown - in such case it looks that everything ok;
other APs which I'm trying to connect to are unconfigured (have default settings) and has no encryption.

P.S. IF_WLAN is constant with name of my WLAN interface

Jasem Mutlaq · Answer 14 · Mon Mar 13 2017 02:26:16 GMT+0800 (China Standard Time)

I was about to report a new issue, but I think this is related. Basically there is a small bug I believe in line 172 in scheme.py

subprocess.check_output(['/sbin/ifdown', self.interface], stderr=subprocess.STDOUT)

For interface names like wlan0-foobar, this would fail. A simple change fixes it. self.interface should be replaced with self.iface

That solved my problem.

Miguel Méndez · Answer 15 · Fri Sep 22 2017 19:00:41 GMT+0800 (China Standard Time)

Same thing happening here! I follow @rockymeza advice but the same error is appearing!
It's even worst for me, I could not connect once!!

I am using a very simple script based on @nox1203 commentary and adding the ifdown command before calling activate(). Any idea?