Session status connected/disconnected

[netgfx]

Is there a way to have a permanent state of the session to show connected or disconnected?

In order to check this state to determine whether or not we need to reconnect to the broker.

[bhargavg]

As of Ver2.0.0, there is no property on MQTTSession to identify whether the session is active or not.

PRs are welcome 😀