I have a bluetooth device. Once I am connected with it, I want to reconnect to it in the background. The problem is that I do not know how I can reconnect to the device after the user force quitted the app (even after new app start)
What I have: A bluetooth device with no services in advertisement data.
Because it has no advertisement data I can't search for peripherals with services in background. So for background excecution I need to call centralManager.connect()
If the app shuts down because of a memory issue or something similar, I can restore everything in centralManagers delegation method willRestoreState The dict contains the peripheral that I can obtain with the CBCentralManagerRestoredStatePeripheralsKey. (As well I implemented to get the UIApplicationLaunchOptionsKey.bluetoothCentrals from launchOptions in willFinishLaunchingWithOptions
The problem
The restoration just works if the user is not force quitting the app. So I know that I can't relaunch the app myself with code again.
All I want is that if the user restarts the app to restore my CBPeripheral. After I could call centralManager.connect(peripheral) again.
additional Info
I store the uuid of the peripheral (peripheral.identifier.uuidString) in NSUserDefault Data.
Ideas
- I thought about creating a CBPeripheral object with device infos. If I read everything correct it is not possible.
- If I save the CBPeripheral in Core Data I do not know what will happen if Apple changes CBPeripherals API, probably it would be a bad idea.
- On some way apple is able to take a snapshot of the CBPeripheral. Can I trigger this snapshot so that I can restore the peripheral with UIApplicationLaunchOptionsKey.bluetoothCentrals and CBCentralManagerRestoredStatePeripheralsKey every time?
