Notification of new unknown devices

[E3V3A]

Feature Request:

It would be great to get a MM notification for newly connected devices that are not in the list.
In that case, instead of the name, we can show the MAC and/or IP in the name fields, perhaps in red or orange color with an icon of exclamation-triangle or user-secret or snapchat-ghost?

[ianperrin]

@E3V3A - the showUnknown config option was intended to fulfil this need and would be displayed with the question icon.

Looks like this needs investigating.