The CoreRealm represents a hermetic, fully-functional instance of the Fuchsia Bluetooth core
stack, complete with all components (bt-init, bt-gap, bt-host, bt-rfcomm) and a bt-hci
emulator. Clients should use the create method to construct an instance, and the instance
method to access the various production capabilities and test interfaces (e.g. from the bt-hci
emulator) exposed from the core stack. Clients of the CoreRealm must offer the tmp storage
capability from the test manager to the “#realm_builder” underlying the RealmInstance.