Here the log for the N30 connected via bluetooth to a USB adapter. I deleted all map files prior to this and plugged the receiver directly into the OTG port not using a hub:
Plugged in 8bitdo USB Adapter (PS Classic Edition, Firmware v1.22):
The file js0 was created.
Close all devices.
Open up to 10 input devices.
The file event0 was created.
Close all devices.
Open up to 10 input devices.
opened /dev/input/event0 (054c:0cda)
opened /dev/input/event1 (054c:0cda)
opened /dev/input/event2 (054c:0cda)
The file event1 was created.
The file event2 was created.
The directory by-id was created.
The directory by-path was created.
Close all devices.
Open up to 10 input devices.
opened /dev/input/event0 (054c:0cda)
opened /dev/input/event1 (054c:0cda)
opened /dev/input/event2 (054c:0cda)
Turned on 8bitdo N30 Bluetooth (Firmware v6.10):
Input event: type=EV_ABS, Axis=0, Offset:=1, jnum=0, ID

0cda. ABS_INFO: min = 0 max = 2
FileLoad(open) File:/media/fat/config/input_054c_0cda.map, error: -1.
FileLoad(open) File:/media/fat/config/input_054c_0cda.map, error: -1.
Input event: type=EV_ABS, Axis=1, Offset:=1, jnum=0, ID

0cda. ABS_INFO: min = 0 max = 2
D-Pad Up:
Input event: type=EV_ABS, Axis=1, Offset:=0, jnum=0, ID

0cda. ABS_INFO: min = 0 max = 2
Input event: type=EV_ABS, Axis=1, Offset:=1, jnum=0, ID

0cda. ABS_INFO: min = 0 max = 2
D-Pad Down:
Input event: type=EV_ABS, Axis=1, Offset:=2, jnum=0, ID

0cda. ABS_INFO: min = 0 max = 2
Input event: type=EV_ABS, Axis=1, Offset:=1, jnum=1, ID

0cda. ABS_INFO: min = 0 max = 2
D-Pad Left:
Input event: type=EV_ABS, Axis=0, Offset:=0, jnum=1, ID

0cda. ABS_INFO: min = 0 max = 2
Input event: type=EV_ABS, Axis=0, Offset:=1, jnum=1, ID

0cda. ABS_INFO: min = 0 max = 2
D-Pad Right:
Input event: type=EV_ABS, Axis=0, Offset:=2, jnum=1, ID

0cda. ABS_INFO: min = 0 max = 2
Input event: type=EV_ABS, Axis=0, Offset:=1, jnum=1, ID

0cda. ABS_INFO: min = 0 max = 2
If you need more logs I have the following gamepads here that I can test for you:
8bitdo: SFC30, NES30 (gamepad), M30 Bluetooth, SN30 Pro, SF30 Pro
Others: Nintendo Switch Pro Controller, XBox One Gamepad, Hori: Pokken Pro Pad, Sony PS3 Dualshock 3, Qanba Q4 RAF Arcade Stick, Speedlink Competition Pro Extra USB 20 years Anniversary Edition