It is not easy to write expectations for this function:
- The data in input is a complex tree that is not comparable.
- The data in input is modified: The attributes of each element of
the tree is added by the server.
To ease test, a default implementation has been added but it is
still possible to override it or set expectations.
That default implementation set unique attribute handles for
each element of the service and _copy_ it in the GattServerMock.
The copy does *not* follow standard BLE API, it is a _POD_ where
each element of the object is accessible as a field. Childs are
stored in vector to ease iteration and memory management.
The representation of the services registered into the mock are
accessible in GattServerMock::services.
Vincent Coubard
Paul Szczepanek