monitor will print the received events for:
UDEV - the event which udev sends out after rule processing

UDEV  [1047.827902] add      /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2 (usb)
ACTION=add
BUSNUM=001
DEVNAME=/dev/bus/usb/001/006
DEVNUM=006
DEVPATH=/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2
DEVTYPE=usb_device
DRIVER=usb
ID_BUS=usb
ID_MODEL=USB_OPTICAL_MOUSE
ID_MODEL_ENC=\x20USB\x20OPTICAL\x20MOUSE
ID_MODEL_FROM_DATABASE=USB+PS/2 Optical Mouse
ID_MODEL_ID=0a4c
ID_REVISION=0100
ID_SERIAL=15d9_USB_OPTICAL_MOUSE
ID_USB_INTERFACES=:030102:
ID_VENDOR=15d9
ID_VENDOR_ENC=15d9
ID_VENDOR_FROM_DATABASE=Trust International B.V.
ID_VENDOR_ID=15d9
MAJOR=189
MINOR=5
PRODUCT=15d9/a4c/100
SEQNUM=2711
SUBSYSTEM=usb
TYPE=0/0/0
USEC_INITIALIZED=1047827725

UDEV  [1047.838543] add      /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2:1.0 (usb)
.MM_USBIFNUM=00
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2:1.0
DEVTYPE=usb_interface
DRIVER=usbhid
ID_MODEL_FROM_DATABASE=USB+PS/2 Optical Mouse
ID_VENDOR_FROM_DATABASE=Trust International B.V.
INTERFACE=3/1/2
MODALIAS=usb:v15D9p0A4Cd0100dc00dsc00dp00ic03isc01ip02in00
PRODUCT=15d9/a4c/100
SEQNUM=2712
SUBSYSTEM=usb
TYPE=0/0/0
USEC_INITIALIZED=1047838285

UDEV  [1047.844235] add      /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2:1.0/0003:15D9:0A4C.0003 (hid)
.MM_USBIFNUM=00
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2:1.0/0003:15D9:0A4C.0003
DRIVER=hid-generic
HID_ID=0003:000015D9:00000A4C
HID_NAME= USB OPTICAL MOUSE
HID_PHYS=usb-0000:00:1a.0-1.2/input0
HID_UNIQ=
MODALIAS=hid:b0003g0001v000015D9p00000A4C
SEQNUM=2713
SUBSYSTEM=hid
USEC_INITIALIZED=1047843984

UDEV  [1047.849623] add      /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2:1.0/0003:15D9:0A4C.0003/input/input14 (input)
.INPUT_CLASS=mouse
.MM_USBIFNUM=00
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2:1.0/0003:15D9:0A4C.0003/input/input14
EV=17
ID_BUS=usb
ID_FOR_SEAT=input-pci-0000_00_1a_0-usb-0_1_2_1_0
ID_INPUT=1
ID_INPUT_MOUSE=1
ID_MODEL=USB_OPTICAL_MOUSE
ID_MODEL_ENC=\x20USB\x20OPTICAL\x20MOUSE
ID_MODEL_ID=0a4c
ID_PATH=pci-0000:00:1a.0-usb-0:1.2:1.0
ID_PATH_TAG=pci-0000_00_1a_0-usb-0_1_2_1_0
ID_REVISION=0100
ID_SERIAL=15d9_USB_OPTICAL_MOUSE
ID_TYPE=hid
ID_USB_DRIVER=usbhid
ID_USB_INTERFACES=:030102:
ID_USB_INTERFACE_NUM=00
ID_VENDOR=15d9
ID_VENDOR_ENC=15d9
ID_VENDOR_ID=15d9
KEY=70000 0 0 0 0 0 0 0 0
MODALIAS=input:b0003v15D9p0A4Ce0111-e0,1,2,4,k110,111,112,r0,1,8,am4,lsfw
MSC=10
NAME=" USB OPTICAL MOUSE"
PHYS="usb-0000:00:1a.0-1.2/input0"
PRODUCT=3/15d9/a4c/111
PROP=0
REL=103
SEQNUM=2714
SUBSYSTEM=input
TAGS=:seat:
UNIQ=""
USEC_INITIALIZED=1047849376

UDEV  [1047.853713] add      /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2:1.0/0003:15D9:0A4C.0003/input/input14/mouse1 (input)
.INPUT_CLASS=mouse
.MM_USBIFNUM=00
ACTION=add
DEVLINKS=/dev/input/by-path/pci-0000:00:1a.0-usb-0:1.2:1.0-mouse /dev/input/by-id/usb-15d9_USB_OPTICAL_MOUSE-mouse
DEVNAME=/dev/input/mouse1
DEVPATH=/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2:1.0/0003:15D9:0A4C.0003/input/input14/mouse1
ID_BUS=usb
ID_INPUT=1
ID_INPUT_MOUSE=1
ID_MODEL=USB_OPTICAL_MOUSE
ID_MODEL_ENC=\x20USB\x20OPTICAL\x20MOUSE
ID_MODEL_ID=0a4c
ID_PATH=pci-0000:00:1a.0-usb-0:1.2:1.0
ID_PATH_TAG=pci-0000_00_1a_0-usb-0_1_2_1_0
ID_REVISION=0100
ID_SERIAL=15d9_USB_OPTICAL_MOUSE
ID_TYPE=hid
ID_USB_DRIVER=usbhid
ID_USB_INTERFACES=:030102:
ID_USB_INTERFACE_NUM=00
ID_VENDOR=15d9
ID_VENDOR_ENC=15d9
ID_VENDOR_ID=15d9
MAJOR=13
MINOR=33
SEQNUM=2715
SUBSYSTEM=input
USEC_INITIALIZED=1047853239

UDEV  [1047.855664] add      /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2:1.0/0003:15D9:0A4C.0003/hidraw/hidraw0 (hidraw)
.MM_USBIFNUM=00
ACTION=add
DEVNAME=/dev/hidraw0
DEVPATH=/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2:1.0/0003:15D9:0A4C.0003/hidraw/hidraw0
MAJOR=245
MINOR=0
SEQNUM=2717
SUBSYSTEM=hidraw
USEC_INITIALIZED=1047855572

UDEV  [1047.935975] add      /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2:1.0/0003:15D9:0A4C.0003/input/input14/event11 (input)
.INPUT_CLASS=mouse
.MM_USBIFNUM=00
ACTION=add
DEVLINKS=/dev/input/by-id/usb-15d9_USB_OPTICAL_MOUSE-event-mouse /dev/input/by-path/pci-0000:00:1a.0-usb-0:1.2:1.0-event-mouse
DEVNAME=/dev/input/event11
DEVPATH=/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2:1.0/0003:15D9:0A4C.0003/input/input14/event11
ID_BUS=usb
ID_INPUT=1
ID_INPUT_MOUSE=1
ID_MODEL=USB_OPTICAL_MOUSE
ID_MODEL_ENC=\x20USB\x20OPTICAL\x20MOUSE
ID_MODEL_ID=0a4c
ID_PATH=pci-0000:00:1a.0-usb-0:1.2:1.0
ID_PATH_TAG=pci-0000_00_1a_0-usb-0_1_2_1_0
ID_REVISION=0100
ID_SERIAL=15d9_USB_OPTICAL_MOUSE
ID_TYPE=hid
ID_USB_DRIVER=usbhid
ID_USB_INTERFACES=:030102:
ID_USB_INTERFACE_NUM=00
ID_VENDOR=15d9
ID_VENDOR_ENC=15d9
ID_VENDOR_ID=15d9
LIBINPUT_DEVICE_GROUP=3/15d9/a4c/111:usb-0000:00:1a.0-1
MAJOR=13
MINOR=75
SEQNUM=2716
SUBSYSTEM=input
USEC_INITIALIZED=1047935054