How could I check if a device is online from remote server?

Hello, from a remote server I should check if a device is online (even with the app closed). Is there someway I could achieve that? Thanks in advance! Best regards.

Is there someway I could achieve that?

No.

Why do you want to do this? If you can explain you high-level goal, we may be able to suggest an alternative path.

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

I should call the device via voip from the server, but before doing that I would like to know if it is online and with internet connection available. Thank you for your help!

This is not how VoIP works on iOS [1]. iOS VoIP apps use a special type of push notification for ring indication. The allows the OS to suspend (or terminate) the app and then resume (or relaunch) it in the background to handle the call.

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

[1] I presume we are talking about iOS here. If not, let me know.

How could I check if a device is online from remote server?
 
 
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