Not updating after network lost

retroflex

I have a pi3 powered mirror that works great when first powering up. A few times a day I can see via the ping module that I loose network. I guess that is normal since the pi is behind the frame, using wifi and is placed some distance from the router.

But after wifi has dropped once, the modules (calendar and MMM-ResRobot) are never updated again. The calendar is stuck in time. Even though network comes back. It seems the ping module is updated though.

If I restart the mirror, the modules will update. And if I access the mirror remotely (with MMM-RemoteControl) it shows correctly remotely.

Any ideas what to do?

Lange

It seems like the browser is crashing or not auto updating since it works when you access from a new location/browser

retroflex

@Lange but the ping module is updated along with the clock module, so a crash seems unlikely. But what can I do to debug this?

rcollie

The Pi may be turning off the wifi to conserve energy. So, you might need to turn off power management. Here’s a good walkthrough courtesy of modmypi (https://www.modmypi.com/blog/disable-wifi-power-management).

If you are experiencing drop outs on your wifi interent connection, it could be that your dongle is turning itself off after an idle period. To stop your wifi dongle doing this, we need to disable its power management.

Either SSH to your Pi, or login to its desktop and open up a terminal.

First, make a backup of your existing interfaces file:

sudo cp /etc/network/interfaces /etc/network/interfaces.backup

Now edit the original interfaces file:

sudo nano /etc/network/interfaces

Assuming you haven’t edited this file before all you need to do is delete its entire contents, and copy the following into it:

auto lo

iface lo inet loopback
iface eth0 inet dhcp

auto wlan0
allow-hotplug wlan0
iface wlan0 inet dhcp
wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
wireless-power off
iface default inet dhcp

The important block of code here is:

auto wlan0
allow-hotplug wlan0
iface wlan0 inet dhcp
wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
wireless-power off
iface default inet dhcp

So only add that section if you have a custom configuration for any other network interfaces.

Now exit the nano editor and save your changes:

Ctrl+x
Y
Enter

Now reboot your raspberry pi:

sudo reboot

Once the raspberry pi has rebooted, check that the wifi dongle’s power management has been disabled by typing this command:

iwconfig

And checking for: “Power Management:off”

da4throux

@retroflex I think I have a similar issue, did @rcollie suggestion solved the issue for you ?