Signed-off-by: Florian Eckert <redacted>
#
# There are three main environment variables that are passed to this script.
#
-# $ACTION Either "ifup" or "ifdown"
+# $ACTION
+# <ifup> Is called by netifd and mwan3track
+# <ifdown> Is called by netifd and mwan3track
+# <connected> Is only called by mwan3track if tracking was successful
+# <disconnected> Is only called by mwan3track if tracking has failed
# $INTERFACE Name of the interface which went up or down (e.g. "wan" or "wwan")
# $DEVICE Physical device name which interface went up or down (e.g. "eth0" or "wwan0")