Bug report: Unable to find child device via discovery if child device has screen closed/off

[Waester]

Noticed that the discovery service does not work if the child device enters some sort of sleep mode (screen off).
If the screen is on, then the child device can be found via the discovery service.
I have turned off all identifiable battery optimization for Child Monitor on the child device, but that didnt help.
Connecting via IP always work, as far as I can tell.

Child device is running Android 12.

[enguerrand]

"Turning off battery optimization" is a mess on android in my experience, and the required steps vary greatly from vendor to vendor. Sometimes the options are hidden in submenus that are hard to discover.

I am afraid this is nothing I'll be able to help you with.
You may be able to work around the problem by keeping the screen on. There is a developer option to never turn of the screen while charging.
Since the audio streaming is pretty battery intensive I tend to keep the child device on a power cable anyway, so in combination with the above mentioned option it is easy to keep the screen on.

Let me know if this helps.

[Waester]

Connecting with IP works fine. (even when the child screen is off)
Just wanted to highlight that the Android Network Service Discovery (NSD) stops working in that specific use-case above and is something that maybe can be improved in the future.

[enguerrand]

Ok thanks for the clarification. That sounds weird, maybe this can indeed be improved.

It might take a while but I'll try to reproduce (and possibly fix) this when I get the chance.