Interface for ensuring a roundtrip to the EIS implementation.
Clients can handle the ‘done’ event to get notified when
the related request that created the
ei_callback object is done.
Note that for a client to receive objects of this type, it must announce
support for this interface in
Since Version1 Event Opcode0
||request-specific data for the callback|
Immediately after sending this request, the object is considered destroyed by the EIS implementation. It must no longer be used by the client.
Notify the client when the related request is done. Immediately after this event
ei_callback object is destroyed by the EIS implementation and as such the
client must not attempt to use it after that point.