Network Status Callback

[seandenigris]

Might be useful e.g. to have greater control over TimeMachine backups. For example, instead of relying on automatic backups, you could have it start when a certain drive is connected.

Further research:

• https://stackoverflow.com/questions/9357054/network-status-change-notification-in-mac-os-x
• https://stackoverflow.com/questions/1083701/how-can-i-check-for-an-active-internet-connection-on-ios-or-macos?noredirect=1&lq=1
• https://stackoverflow.com/questions/7793657/asynchronous-network-interface-status-check?noredirect=1&lq=1