iOS Background Restoration #3
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Android: Swaps activity() calls for context() where only a context is required. The only place an activity is required is when requesting permissions. This patch will return an error when the plugin is used where permissions have not been granted, and there is no activity available to request permissions iOS: To use bluetooth-central background role and continue to processes in the background it is required that a unique ID (CBCentralManagerOptionRestoreIdentifierKey) be set when the CBCentralManager is initialized. (https://developer.apple.com/documentation/corebluetooth/cbcentralmanageroptionrestoreidentifierkey?language=objc). Delays instanciation of the cbcentralmanager to when it is first used, so allow setting of a unique id from dart. When CBCentralManagerOptionRestoreIdentifierKey is set, the CBCentralManagerDelegate must implement centralManager:willRestoreState. The current implmentation is empty as it appears that setting a unique ID is sufficient to stop iOS killing the app once it has been backgrounded, if a bluetooth connection is active, or a scan is in progress. This has a side effect of printing an API-MISUSE warning when CBCentralManagerOptionRestoreIdentifierKey is not used, because the method centralManager:willRestoreState is always implemented. The warning is harmless when not using CBCentralManagerOptionRestoreIdentifierKey. Dart: To support the setting of a unique Id, introduces setUniqueId(String). This should be called before any methods that will instanciate the native instance of the cbcentralmanager.
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New permissions are needed in the Info.plist for the background CoreBluetooth usage: |
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Adds unique id for central manager restoration and willRestore interface so that CoreBluetooth can wake up the application.
Primarily pulling over compatible changes from pauldemarco#210