selective D-BUS signal emitting from ObServer

[Dmitry]

Hi All,

I have a situation where I have a single ObServer object and a set of
Clients. ObServer and clients connected through D-BUS (IPC). ObServer has
generic interface for all clients. But, time to time ObServer needs to
notify clients about some events. Clients listen for a ObServer Generic
interface signal OnNotify().

Question: How to emit D-BUS signal (OnNotify()) from ObServer to specified
client (instead of broadcast to all) ?

p.s

Qt D-BUS used for wrapping but any approach are welcome.
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