With 2 SSH sessions, in one I ran:

Lakka:~ # bluetoothctl

[NEW] Controller B8:27:EB:16:9B:AD BlueZ 5.43 [default]
[NEW] Device 00:12:A1:6D:1A:65 ION iCade Game Controller
[CHG] Device 00:12:A1:6D:1A:65 Connected: yes
[CHG] Device 00:12:A1:6D:1A:65 Connected: no
[CHG] Device 00:12:A1:6D:1A:65 Connected: yes
[CHG] Device 00:12:A1:6D:1A:65 Connected: no
[bluetooth]# connect 00:12:A1:6D:1A:65
Attempting to connect to 00:12:A1:6D:1A:65
[CHG] Device 00:12:A1:6D:1A:65 Connected: yes
Connection successful
[CHG] Device 00:12:A1:6D:1A:65 ServicesResolved: yes
[ION iCade Game Controller]#

On the other I ran:

Lakka:~ # udevadm monitor

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

KERNEL[476.060067] add      /devices/platform/soc/3f201000.serial/tty/ttyAMA0/hc                                             i0/hci0:11 (bluetooth)
UDEV  [476.065081] add      /devices/platform/soc/3f201000.serial/tty/ttyAMA0/hc                                             i0/hci0:11 (bluetooth)
KERNEL[480.387038] remove   /devices/platform/soc/3f201000.serial/tty/ttyAMA0/hc                                             i0/hci0:11 (bluetooth)
UDEV  [480.391240] remove   /devices/platform/soc/3f201000.serial/tty/ttyAMA0/hc                                             i0/hci0:11 (bluetooth)
KERNEL[483.816397] add      /devices/platform/soc/3f201000.serial/tty/ttyAMA0/hc                                             i0/hci0:11 (bluetooth)
UDEV  [483.824761] add      /devices/platform/soc/3f201000.serial/tty/ttyAMA0/hc                                             i0/hci0:11 (bluetooth)
KERNEL[488.070387] remove   /devices/platform/soc/3f201000.serial/tty/ttyAMA0/hc                                             i0/hci0:11 (bluetooth)
UDEV  [488.074260] remove   /devices/platform/soc/3f201000.serial/tty/ttyAMA0/hc                                             i0/hci0:11 (bluetooth)
KERNEL[517.677335] add      /module/hidp (module)
UDEV  [517.681820] add      /module/hidp (module)
KERNEL[517.793367] add      /devices/platform/soc/3f201000.serial/tty/ttyAMA0/hc                                             i0/hci0:12 (bluetooth)
UDEV  [517.798485] add      /devices/platform/soc/3f201000.serial/tty/ttyAMA0/hc                                             i0/hci0:12 (bluetooth)
KERNEL[517.907234] add      /devices/platform/soc/3f201000.serial/tty/ttyAMA0/hc                                             i0/hci0:12/0005:15E4:0132.0002 (hid)
UDEV  [517.913343] add      /devices/platform/soc/3f201000.serial/tty/ttyAMA0/hc                                             i0/hci0:12/0005:15E4:0132.0002 (hid)

so it appears udevadm is picking up on events?

Lakka:~ # cat /proc/bus/input/devices

I: Bus=0003 Vendor=0079 Product=0006 Version=0110
N: Name="Generic   USB  Joystick  "
P: Phys=usb-3f980000.usb-1.2/input0
S: Sysfs=/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.2/1-1.2:1.0/0003:0079:0006.0001/input/input0
U: Uniq=
H: Handlers=js0 event0
B: PROP=0
B: EV=20001b
B: KEY=fff 0 0 0 0 0 0 0 0 0
B: ABS=3002f
B: MSC=10
B: FF=1 7030000 0 0

but this outputs only my N64 USB controller :(

and finally:

Lakka:~ # udevadm info --name=input/event0
P: /devices/platform/soc/3f980000.usb/usb1/1-1/1-1.2/1-1.2:1.0/0003:0079:0006.0001/input/input0/event0
N: input/event0
S: input/by-id/usb-0079_Generic_USB_Joystick-event-joystick
S: input/by-path/platform-3f980000.usb-usb-0:1.2:1.0-event-joystick
E: DEVLINKS=/dev/input/by-id/usb-0079_Generic_USB_Joystick-event-joystick /dev/input/by-path/platform-3f980000.usb-usb-0:1.2:1.0-event-joystick
E: DEVNAME=/dev/input/event0
E: DEVPATH=/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.2/1-1.2:1.0/0003:0079:0006.0001/input/input0/event0
E: ID_BUS=usb
E: ID_FOR_SEAT=input-platform-3f980000_usb-usb-0_1_2_1_0
E: ID_INPUT=1
E: ID_INPUT_JOYSTICK=1
E: ID_MODEL=Generic_USB_Joystick
E: ID_MODEL_ENC=Generic\x20\x20\x20USB\x20\x20Joystick\x20\x20
E: ID_MODEL_ID=0006
E: ID_PATH=platform-3f980000.usb-usb-0:1.2:1.0
E: ID_PATH_TAG=platform-3f980000_usb-usb-0_1_2_1_0
E: ID_REVISION=0109
E: ID_SERIAL=0079_Generic_USB_Joystick
E: ID_TYPE=hid
E: ID_USB_DRIVER=usbhid
E: ID_USB_INTERFACES=:030000:
E: ID_USB_INTERFACE_NUM=00
E: ID_VENDOR=0079
E: ID_VENDOR_ENC=0079
E: ID_VENDOR_ID=0079
E: MAJOR=13
E: MINOR=64
E: SUBSYSTEM=input
E: TAGS=:uaccess:seat:
E: USEC_INITIALIZED=4718152

Lakka:~ # udevadm info --name=input/event1
device node not found