The official Hotplug documentation only briefly introduces neigh and net, but unlike other directories that have detailed parameter descriptions and script examples. So how can we find neigh, net parameters and examples?
The net event class is forwarding kernel uevents as-is. Parameters vary depending on interface type. You can find examples via the cli by inspecting
cat /sys/class/net/br-lan/uevent etc.
$ACTION will be either
Parameters for the neigh, dhcp etc. classes can be seen at
Also refer to https://openwrt.org/docs/guide-user/base-system/hotplug#usagetroubleshooting to dump the environment for received events.
Tested according to the sample, there is no action, give up!