Script to reconnect wifi

fp01 · January 19, 2019 at 9:47 AM

I occasionally have a wifi dropout and (I guess) because I use a remote SQL database for my library, eventually Kodi totally freezes meaning I have to power cycle to get it working again.

I know I can automatically start a bash script with Kodi on LibreELEC so have created this one, it seems to start OK but doesn't detect it loses connection (nothing's written to the log). Any ideas please?

I run LibreELEC on my ODROID-C2, is there a way to temporarily restore the heartbeat on the blue LED to verify it's not a total lockup?
Thanks for reading

Bash

#!/bin/bash
echo "Started checking at $(date)" >> /storage/checkwifi.log
while :
do
        echo "$(tail -n 50 /storage/checkwifi.log)" > /storage/checkwifi.log
        echo "Checking... $(date)"
        if ! [ "$(ping -c 1 172.16.0.1)" ]; then
                echo "Connection lost at $(date), restarting wifi" >> /storage/checkwifi.log         
                ifconfig wlan0 down
                sleep 5
                ifconfig wlan0 up
                echo "Wifi started, waiting for connection" >> /storage/checkwifi.log
                sleep 60
                if ! [ "$(ping -c 1 172.16.0.1)" ]; then
                        echo "Connection not back up yet, adding extra delay" >> /storage/checkwifi.log                      
                        sleep 60
                else
                        echo "Connected ok at $(date)" >> /storage/checkwifi.log 
                fi
        else    
                echo "Connected OK at $(date)" 
        fi      
        sleep 60
done

Display More

**Iridium** · January 20, 2019 at 6:26 PM Official Post

At first I would try and find out *why* your wifi is dropping out. If using the internal wifi try removing anything metal that might be in the way of your router. Alternatively buy a USB adapter with a better antenna which can be positioned to get better reception.

As to the script, I would run it in a terminal and see what the output is.

fp01 · January 20, 2019 at 6:53 PM

If I start the script manually, line 6 echoes to the console every minute or so as it should. I might disable the tail command and just have it log everything for a while to check it doesn't stop running for no reason.

I have noticed sometimes after rebooting the device, I usually/always have to manually toggle the connection in LibreELEC settings straight away as it shows "failure" under the network name. I wonder if I've written the 'if' statement incorrectly because it doesn't restart the wifi for this, or log anything to the log file after the first write to say it's active.

There's no internal wifi in the C2, I'm using a USB adapter, this one: https://www.amazon.co.uk/dp/b06wwhh29y/. I'm not sure why it drops out, the signal is decent enough. It's not a fancy adapter but I didn't have any trouble using it with my (Windows) laptop, and that was through a long USB extension cable in a hotel, so I didn't have to sit by the door to get online as the signal was poor.

**vpeter** · January 21, 2019 at 9:22 AM

I don't think your if statement works. Try with

Code

  ping -c 1 -w 3 172.16.0.1 &>/dev/null
  if [ $? -ne 0 ]; then

fp01 · January 22, 2019 at 12:18 AM

That modification worked perfectly in a simple test script using that IP (172.16.0.1 is my modem/router) and also as expected with one that's not in use. Hopefully this will act as a 'plaster' until I can sort out a plan B...funds permitting, new carpets could mean running ethernet, but I might just settle for powerline.

I found how to put the blue LED back on so posted here for reference:

Code

echo heartbeat > /sys/class/leds/blue\:heartbeat/trigger

Doing this means I can see if the unit has locked up completely or if it's just Kodi getting confused.

Thanks both for your assistance

Morphy · October 10, 2020 at 4:19 PM

EDIT: fixed this, the script wasn't in unix format!

I'm struggling with this script, probably something simple but this is what I have:

Bash

#!/bin/bash
echo "Started checking at $(date)" >> /storage/checkwifi.log
while :
do
        echo "$(tail -n 50 /storage/checkwifi.log)" > /storage/checkwifi.log
        echo "Checking... $(date)"
        ping -c 1 -w 3 192.168.43.1 &>/dev/null
        if [ $? -ne 0 ]; then
                echo "Connection lost at $(date), restarting wifi" >> /storage/checkwifi.log         
                ifconfig wlan0 down
                sleep 5
                ifconfig wlan0 up
                echo "Wifi started, waiting for connection" >> /storage/checkwifi.log
                sleep 60
                ping -c 1 -w 3 192.168.43.1 &>/dev/null
                if [ $? -ne 0 ]; then
                        echo "Connection not back up yet, adding extra delay" >> /storage/checkwifi.log                      
                        sleep 60
                else
                        echo "Connected ok at $(date)" >> /storage/checkwifi.log 
                fi
        else
                echo "Connected OK at $(date)" 
        fi
        sleep 60
done

Display More

I get this error when running:

Code

autoconnectwifi.sh: line 26: syntax error: unexpected "done" (expecting "then")

So after figuring my stupid mistake I found this other script and adapted it. This uses the wifi network instead of a ping, maybe better if for some reason the IP will change or unavailable. wifi_servicecode_managed_psk has been changed from what is listed in connmanctl services

Bash

#!/bin/bash

while true ; do
    if ifconfig wlan0 | grep -q "inet addr:" ; then
        sleep 60
    else
        connmanctl connect wifi_servicecode_managed_psk &>/dev/null
        sleep 10
    fi
done

janbenes · May 24, 2022 at 6:05 PM

Hello, I have following questions:

connmanctl gives me error "Error /net/connman/service/wifi_servicecode_managed_psk: Method "Connect" with signature "" on interface "net.connman.Service" doesn't exist"

How do I use it without error? How to I input wifi password with this method?

Thank you, Jan

ghtester · May 26, 2022 at 1:21 AM

Learn something about ConnMan first: https://wiki.archlinux.org/title/ConnMan

You need to obtain your specific service name related to your AccessPoint, by using the connmanctl services command. Then connmanctl connect wifi_*****_psk should work.

**chewitt** · May 26, 2022 at 2:29 AM

You need to manually connect and cache the credential once, then you can connect/disconnect the service in scripts.

connmanctl

agent on

scan wifi

services

connect <service>