seemoo-lab/fitness-app

Repair key saving where file name is sometimes "null"

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Currently, the information for one device (enc key, auth key etc) are saved internally. Sometimes the file names for new devices become "null", apparently because the name of the device is not yet known. This leads so problems when the device should be reconnected and the old keys should be fetched. This issue is a problem currently when Johannes tries to connect to the One.

Idea: Use Bluetooth Mac Address instead, since this is known from the beginning.