Show network interface status.
If the instance is not specified, it uses the interface for the default route.
Specify ipv6, ipv4, or either by setting ADDRESS_FAMILY to
inet6, inet, or inet6?.
If an invalid interface is specified, nothing is printed.
[iface]
command=$SCRIPT_DIR/iface
#LABEL=wlan0:
#IFACE=wlan0
#ADDRESS_FAMILY=inet6?
color=#00FF00
interval=10