Signal not emitted over QDbus

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Hi !

I'm trying to use the QDbus API to create a simple client/server application for testing purposes.
I created a class which contains a signal to be exported as my API over DBus.
I added a server to register the service and emit the signal as well as a client in which i connected
the signal to a slot.

Unfortunately, it's not working. :(
You can view the code here => https://github.com/Wenzel/procexp_helper/tree/01

I tried to use dbus-monitor to view signals sent by the server, but I saw nothing.
Therefore I think that the issue lies in the server.
Maybe I forgot something required to send a signal over DBus ?

If someone who has experience in developing Qt application with DBus API could look at the code
and tell me what wrong, I would really appreciate !

Thanks !