Dangling connections

[pintify]

Describe the bug

I've noticed that in the Connections tab sometimes the connections remain active despite the device has been disconnected for a long time. That is specially common when the device is not sending the BIRTH certificate. I think it happens mostly when the platform is restarted for maintenance tasks or when the network link is abruptly broken.

When this happens, reconnect with the same client ID is very unstable because and publishing or subscribing does not always work properly.

Version of Kapua
1.6.12

Type of deployment
[x] Docker
[ ] Openshift (in its variants)
[ ] Others

Main component affected
[x] Console (in case of console please report info on which browser you encountered the problem)
[x] REST API
[x] Message Broker
[ ] - Others