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This PR refines the _bleio API. It was originally motivated by
the addition of a new CircuitPython service that enables reading
and modifying files on the device. Moving the BLE lifecycle outside
of the VM motivated a number of changes to remove heap allocations
in some APIs.
It also motivated unifying connection initiation to the Adapter class
rather than the Central and Peripheral classes which have been removed.
Adapter now handles the GAP portion of BLE including advertising, which
has moved but is largely unchanged, and scanning, which has been enhanced
to return an iterator of filtered results.
Once a connection is created (either by us (aka Central) or a remote
device (aka Peripheral)) it is represented by a new Connection class.
This class knows the current connection state and can discover and
instantiate remote Services along with their Characteristics and
Descriptors.
Relates to #586
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If a port is using interrupt_char.c then it must enable
MICROPY_KBD_EXCEPTION. This is the case for all official ports.
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Ultimately all ports that use lib/utils/interrupt_char would enable
MICROPY_KBD_EXCEPTION, so this is an interim solution.
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Utility functions for keyboard interrupt handling, to be reused across
(baremetal) ports.
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