If your app needs to connect to a known device whenever it becomes available, state restoration will allow it to keep the connection request active even after the app is terminated by the OS due to a low memory scenario. To enable state restoration, run the following within AppDelegate.FinishedLaunching before any other usage of the plugin:
BleImplementation.UseRestorationIdentifier("YourAppRestorationId");
When the device becomes available, the OS will automatically re-launch your application in background. Once the app is launched, it should re-connect to the device.
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State restoration is available for background connections, so the app will require the
bluetooth-centralbackground mode enabled. -
Since the app is re-launched into background, device connection should not rely on any UI interaction. Ideally, the device connection process should be fired straight from the
AppDelegate.FinishedLaunching. -
Background processing rules still apply after re-launching (i.e. ~10 seconds time window).
- State restoration provides a list of devices (peripherals) connected when re-launching the app. The current implementation ignores this list, so you will need to re-connect to all the expected devices.