Wifi reconnect: doesn't work

[biva]

Hello,
Thanks for your plugin, but it doesn't work on my config:
Volumio 2.201, Raspbery Pi3, Wifi with fixed IP, Plugin ver 0.0.7
Steps to reproduce

1. Activate plugin
2. Disconnect wifi box
3. Wait for 1 minute
4. See that the Volumio hotspot has been launched
5. Reconnect wifi box
6. Wait for 1 minute
7. Result: Volumio doesn't reconnect to the box, and the Volumio hotspot is not active anymore
   Any idea?

[biva]

Hello @balbuze
I found a way to make reconnection work. I created a script:

/sbin/ifconfig wlan0 down
/sbin/ifconfig wlan0 up

What is important here, in order to make it work with cron, is to indicate the full path of ifconfig: /sbin/ifconfig.

Then I launch the script with crontab just after my rooter restarts the wifi, every morning at 7:05

5 7 * * * /home/volumio/script_wifi.sh

The script could be optimized to check the internet connection, but I did not test it:

if ! /bin/ping -I wlan0 -c 1 google.com; then
/sbin/ifconfig wlan0 down
/bin/sleep 5
/sbin/ifconfig wlan0 up
fi

And, for the record, here is another way of testing the connection, that I found in a forum. This uses ip instead of ifconfig, which is interesting because ifconfig has been removed from the last version of Debian:

# The IP for the server you wish to ping (8.8.8.8 is a public Google DNS server)
SERVER=8.8.8.8
# Only send two pings, sending output to /dev/null
/bin/ping -c2 ${SERVER} > /dev/null
# If the return code from ping ($?) is not 0 (meaning there was an error)
if [ $? != 0 ]
then
  # Restart the wireless interface
  /sbin/ip link set wlan0 down
  /sbin/ip link set wlan0 up
fi

[balbuze]

hi!
for info : the plugin does not requires cron as it use a systemd timer. And if you want to know the used command, have a look at the file wifireconnect.sh.tmpl and you'll see
#!/bin/bash

SERVER=${serverip}
NINTERFACE=${interface}

ping -c2 ${SERVER} > /dev/null

if [ $? != 0 ]
then
# Restart the wireless interface
ip link set ${NINTERFACE} down
sleep 2
ip link set ${NINTERFACE} up
#systemctl stop wireless.service
#sleep 2
#systemctl start wireless.service

fi
But I'm going to change it with the suggestion from the other issue if it works better...

[balbuze]

should be fixed with the last update ver 0.0.8

[biva]

But I'm going to change it with the suggestion from the other issue if it works better...

Do you mean commands with the full path? I think it's a good idea. Thank you!

I looked at your modifications in https://github.com/balbuze/volumio-plugins/blob/master/plugins/system_controller/wifireconnect/wifireconnect.sh.tmpl I'm not sure which commands should be with the full path:

• /bin/ping ?
• /bin/sleep ?
• /bin/systemctl ?

[biva]

I just installed 0.0.9 on RPI3. It doesn't reconnect either :(
And as it doesn't reconnect, I'm forced to reboot, and then lose the logs. Any idea?

[biva]

I reactivated the hotspot, in order to read the logs here: /var/log/volumio.log

2017-09-11T14:29:32.782Z - info: wifireconnect Daemon Started
2017-09-11T14:29:32.784Z - info: wifireconnect started

They are the only lines concerning wifi or wlan. Is there another log I could share?

[balbuze]

Very weird. I'm using it with a Rpi2 and a usb WiFi dongle. And it reconnects each time I power off/on my router... What is the difference with your settings ?

[balbuze]

I guess you can't plug a screen?

[biva]

Hello, I could plug a screen, but not for too long. What we could do, if you're ok with that, is planning a moment when you're available, and chat on Gitter. I'd have a screen plugged and we could investigate further. I'm available for example today before 1pm (UTC+2), or after 4:30 pm.

[balbuze]

sorry but I was at work... I think we are in the same time zone, maybe tomorrow but later..

[biva]

Thanks, tell me when you're available, I'll do my best

[thalion0]

Don't know if I am correct. The "Wifireconnect service" is calling

ExecStart=/bin/bash /data/plugins/system_controller/wifireconnect/wifireconnect.sh

but this file only containts "empty do not remove". Instead the file "wifireconnect.sh.tmpl" contains the code. Why?

[thalion0]

Okay, I've made some tests. First of all copied wifireconnect.sh.tmpl to wifireconnect.sh and used following content:

#!/bin/bash

SERVER=${serverip}
NINTERFACE=${interface}

# wget -nv --tries=10 --timeout=20 --spider ${SERVER}
ping -c2 ${SERVER} > /dev/null

if [ $? != 0 ]
then
   # Restart the wireless interface
   # ip link set ${NINTERFACE} down
   #       sleep 2
   #   ip link set ${NINTERFACE} up
        #systemctl stop wireless.service
        #sleep 2
        #systemctl start wireless.service
        #sudo /sbin/ifdown --force ${NINTERFACE}
        #sudo /bin/ip link set ${NINTERFACE} up
        systemctl restart wireless
fi

After restart of service I powered off my Access Point and Volumio lost connection. After some seconds Access Point was up again and again some seconds later Volumio connected again.

[balbuze]

Tmpl is the template used to create the sh file. A empty sh exists because it keeps the execute mode when it is filled by the plugin with the template.

[balbuze]

Just add your code in tmpl. The plugin will fill the sh when you save it

[thalion0]

Does not work for me. After fresh install with my changes I see following error. Same without changes by me:

 wifireconnect.service - Wifireconnect service
   Loaded: loaded (/etc/systemd/system/wifireconnect.service; disabled)
   Active: failed (Result: exit-code) since Fri 2018-01-05 13:17:34 UTC; 53s ago
  Process: 3490 ExecStart=/bin/bash /data/plugins/system_controller/wifireconnect/wifireconnect.sh (code=exited, status=127)
 Main PID: 3490 (code=exited, status=127)

Jan 05 13:17:34 radio-flur systemd[1]: Started Wifireconnect service.
Jan 05 13:17:34 radio-flur volumio[3490]: /data/plugins/system_controller/wifireconnect/wifireconnect.sh: line 1: empty: command not found
Jan 05 13:17:34 radio-flur systemd[1]: wifireconnect.service: main process exited, code=exited, status=127/n/a
Jan 05 13:17:34 radio-flur systemd[1]: Unit wifireconnect.service entered failed state.

Because of the "command not found" message I went this way I described earlier with success.

[balbuze]

well, I uploaded a new version that should fix miscellanous problems. !don't froget to save, evenen if you don't change the setting. It's probably the reason of your empty sh file...

[thalion0]

Yep balbuze that's it. Solved for me now and reconnect is working fine.

Thanks a lot!

[balbuze]

good! I close this issue...