You cannot connect anything to a signal in the same class.

[mtty]

This post is deleted!

[JonB]

@mtty
Just to say: there is no problem connecting a signal to a slot (functor or method) within the same class. Your code for that is correct, as far as your snippet shows. I cannot say anything about QML as I know nothing about that. If signal this->portChanged() is raised your qDebug() or this->textSlot() should be called. (I assume your _timer is a class member or "global".)

Your this must be of class BackboneInf, how does that relate to your class Ctr? I am lost on that in your code....

[mtty]

@JonB thank you for quick reply. It is stupid mistake. Another constructor is used; my mistake.