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doc/gatt-api: New API properties and methods for the GATT D-Bus API.
This patch introduces the following new properties to the GattService1
interface:
Device: A remote-service-only property that contains the D-Bus object
path of the associated device.
Primary: Reflects whether or not a services is primary or secondary.
This patch also introduces new methods to GattCharacteristic1 and
GattDescriptor1 for reading and writing the corresponding attribute
values and a new signal for being notified of received notifications and
indications.
The "Value" D-Bus property is removed from both interfaces
and replaced with asynchronous ReadValue and WriteValue functions. This
is due to the fact that DBus.Properties.Get is synchronous and without
an asynchronous way of issuing a GATT value read request, there are
cases where a single read and cache based approach becomes limiting
(e.g. when a characteristic allows reads but no notifications) and
relying on the PropertyChanged signal to retrieve the value of a read
request asynchonously as well as to signal notifications/indications
makes for a vague API.
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