I want to know that is there any message inqueue limit define for service bus queue or topic.

Let say I have create a device on azure iot hub .Now I am sending c2d message to this device. If there is no receiver available for this device. Then it has capability to save 50 message in queue. After this limit . It will discard all the c2d message send to it.

I just want to confirm that same kind of scenario create in service bus queue or topic.

May be this scenario not exists with service bus queue or topic. But I have some confusion.