To function properly, the desktop app and the web client (“Threema Web”) either need an active connection to your iPhone/iPad or a way to wake up your mobile device. Due to restrictions on Apple’s part, it is, unfortunately, no longer possible for the desktop app / the web client to wake up the app and re-establish the connection in case it is lost.
For this reason, your device will not lock automatically while the Threema app is in the foreground and connected to the desktop app / web client.
If you open another app or manually lock your mobile device, the connection to the desktop app / web client will be lost after 30 seconds. On the computer, a message will appear asking you to open Threema again on your mobile device. The connection will be restored as soon as the Threema app is running in the foreground again.
With Threema 4.6 for iOS and earlier app versions, it was possible to use the desktop app / the web client even when your device was locked or the app was not running in the foreground. This mode of operation is no longer supported by Apple.
Please note that the current solution is a temporary workaround to deal with the iOS restrictions, and it will become obsolete once the multi-device functionality is available.
