Problem with updating widget

[Aleksey]

Hello! Sorry for my bad English. I Just started to learn this language)

I made some interface for Raspberry pi 3 B+ (raspberry os lite latest version) and have a problem.

Interface is runtime generated (based on data from external device). All widgets are stored in a list. Ten times per second I update all widgets in this list.

After some time (from 10 seconds to 2 hours) some widgets (usually one, sometimes second stop updating after some time to) stop updating. I apply a new value to it, but it does not change it's image. If I try to read the value - _ get proper (updated) value. I catched this moment and tried to debug it. I see that widget get new value and kivy-side start to use it, but this is my first python project and kivy code is to difficult to debug for me.

Can you advise what logs should I check to find cause of this issue? or maybe you know solution for this situation?

Thank you/

[Elliot Garbus]

Try to create a minimal executable example that represents your issue.

 Here are some thoughts:

Kivy creates a log in a .kivy/logs directory.  See if there is any useful information in the log.

 

I assume you are adding widgets to the widget tree by calling add_widget(), Are you removing the wigdgets from the widget tree prior to adding more widgets – or are you just adding widgets?  Failure to remove widgets and just adding widgets could result in an out of memory or stack overflow.

 

 

If possible, I would recommend you reduce the update frequency.  You are currently updating the UI, 10 times per second.  Drop this to once a second or even once every 3 or 5 seconds or more.

 

As a debugging suggestion, walk the widget tree and print out the widgets after each update (use walk()).  Make sure the widget tree is as you expect – and not growing.

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