Android client running in the background can not receive information.When Android is in the background, the status is set to leave, a person sends me a message without any prompt, and there is a message prompt when the app is running in the foreground.Why can’t background operation receive information?
Android will put your apps to deep sleep if you don’t specifically allow them to stay awake for notifications. This is an Android thing!
Have a general web search for something like:
“android app no notifications”
The sort of setting might be:
“Disable power restrictions”
“Enable background data”