Catch invalid user input in WebUI

[TuxMaus]

The display is switched off every full hour. It seams as there is a corn job executed every hour but I can`t find any suitable cronjob.

According to /data/etc/crontabs/root, the display should be switched off at midnight but not every hour:

0 8 * * * /usr/bin/photoframe.sh display on
0 24 * * * /usr/bin/photoframe.sh display off

And also /etc/crontabs/root has no corresponding entry:

13 * * * * /usr/sbin/logrotate /etc/logrotate.conf
0 2 * * 0 /usr/sbin/https-update
*/15 * * * * /usr/sbin/dyndns-update
*/30 * * * * /usr/bin/photoframe.sh sync

Any ideas where else to search?

[avanc]

Hm, everything looks OK. Can you also check that /etc/cron.d is empty and /data/etc/cron.d does not exist?
When its turned off, can you activate it again via web interface?

[TuxMaus]

Sorry, I forgot this info.

Yes, /etc/cron.d is empty and /data/etc/cron.d does not exist. The Display can be activated via the web interface and also via vcgencmd display_power 1.

But every time I swith the display on it will be switched off at full hour:

11.01.2024 06:56: display_power=1
11.01.2024 06:57: display_power=1
11.01.2024 06:58: display_power=1
11.01.2024 06:59: display_power=1
11.01.2024 07:00: display_power=0
11.01.2024 07:01: display_power=0
11.01.2024 07:02: display_power=0

I have absolutely no idea why the display is switched off. Is there any service running which can switch the display off?

[TuxMaus]

Issue solved!

It was just a silly mistake in the time code for cron. The time code for the hour is defined in the range from 0 to 23. 24 for midnight is not known by cron and - as it seems - interpreted like the *. Therefore, the script was executed every hour and not just at midnight.

A small hint in the WebUI could problaby prevent others from doing the same mistake.