I recently switched to Wifi from a USB-Ethernet adapter on a PiZero. Unfortunately, it will not reconnect if the AP drops. It looks like exactly the same problem in this ticket - https://github.com/Fourdee/DietPi/issues/396
and I made the adjustments recommended from the stackexchange post:
Go to /etc/ifplugd/action.d/ and rename the ifupdown file to ifupdown.original
Then do: cp /etc/wpa_supplicant/ifupdown.sh ./ifupdown
Finally: sudo reboot
That's all. Test this by turning off/on your AP; you should see that your Raspberry Pi properly reconnects.
It still doesn't reconnect unless unplug/replug the usb-wifi adapter or reboot the Pi Zero.
Any ideas?
Last edited by subaquatic on Thu Oct 20, 2016 4:03 pm, edited 1 time in total.
**EDIT - I spoke to soon. Still does not reconnect wifi after it drops. I've tried with different adapters, same problem. Interestngly, I have a B+ running dietpi and it reconnects just fine.
subaquatic wrote:Set the Wifi country and it started working
**EDIT - I spoke to soon. Still does not reconnect wifi after it drops. I've tried with different adapters, same problem. Interestngly, I have a B+ running dietpi and it reconnects just fine.
Yep expected results.
If the device is unplugged and plugged back in, the kernel will detect a hotplug event and automatically try to reconnect.
As for when the router WiFi drops, you'd need to make a script that monitors and checks for connection drops, to bring down and up the adapter.
So you could do something along the lines of (untested):
#!/bin/bash
while true
do
#check connection
# change 192.xxxx to your router IP address
if (( $(ping -c 1 192.168.0.1) != 0 )); then
# - reconnect
ifdown wlan0
ifup wlan0
# - wait 60 seconds before checking again
sleep 60
fi
done
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