devd-backuphdd.conf

/*****************************************************************
devd-config, which triggers the Pool-Backup script, when the Backup USB HDD is attached
script in /usr/local/etc/devd/ doesn't survive a reboot
so copy it to /usr/local/etc/devd/ with init-script - truenas-copy-devdconf.sh

This is the devd-rule for FreeBSD (TrueNas Core), see the file
udev-backuphdd.conf for Linux (eg TrueNas Scale or others).

*******************************************************************
 DO NOT MOFIDY THIS FILE in /usr/local/etc/devd/
 MODIFY IN YOUR SCRIPT LOCATION
*******************************************************************

this one also dosn't work:
so add dicrectory to: /conf/base/etc/devd.conf
place in: /root/scripts/devd/
(truenas-copy-devdconf.sh will do this steps for you)
It won't survive upgrades though...
see: https://www.truenas.com/community/threads/devd-conf-keeps-on-getting-reset-on-reboot.6100/
*******************************************************************

restart service after modifications; /etc/rc.d/devd restart
see: https://www.freebsd.org/cgi/man.cgi?devd.conf

# Version: 0.3
# Date: 17.09.2022
# Published: 05.06.2021

get information on USB device with: cat /var/run/devd.pipe 
while attaching the USB-Device
OR:
usbconfig
usbconfig ugen4.2 dump_device_desc


The general syntax	of a statement is:

	   statement priority {
		   substatement	"value";
		   ...
		   substatement	"value";
	   };
	   
Example:

     #
     # Match a USB device type
     #
     notify 0 {
	     match "system"		"USB";
	     match "subsystem"		     "INTERFACE";
	     match "type"		     "ATTACH";
	     match "intclass"		     "0x0e";
	     action "logger USB	video device attached";
     };

*******************************************************************/

// *******************************
// Backup-USB HDD is attached
// *******************************

/* don't use this style, as the event is triggered more than once
notify 100 {
	match "system"		"GEOM";
	match "subsystem"	"DEV";
	match "type"			"CREATE";
	match "cdev"			"gptid/xxxxx";
	action "/root/scripts/truenas-poolbackup.sh";
};
*/

// Instead use this
// External Backup HDD
notify 100 {
	match "system"		"USB";
	match "subsystem"	"INTERFACE";
	match "type"			"ATTACH";
	match "vendor"		"xxxxx";
	match "product"		"xxxxx";
	match "sernum"		"xxxxx";
	action "/root/scripts/truenas-poolbackup.sh";
};