How to grant systemd-nspawn access to USB device?

[Kevin P <petrilli.kevin@xxxxxxxxx>]

Good evening everyone.

I would like a nspawn container on my Raspberry Pi (Raspbian, systemd 247) to access a RTL2838 DVB-T USB stick.

Inside the container, dump1090 will run and feed aircraft data (piaware and adsbexchange projects).

lsusb gives:

Bus 001 Device 005: ID 0bda:2838 Realtek Semiconductor Corp. RTL2838 DVB-T

file /dev/bus/usb/001/005 returns:
/dev/bus/usb/001/005: character special (189/4)

And finally grep 189 /proc/devices shows:
189 usb_device

I edited both the .nspawn file and the .service file, of which I'm reporting the relevant parts below.

/etc/systemd/nspawn/ads-b.nspawn

[Files]
Bind=/dev/bus/usb/001/005

systemd-nspawn@ads-b.service

[Service]

DeviceAllow=/dev/bus/usb/001/005 rwm
DeviceAllow=usb_device rwm

However I feel like I am doing something wrong, as starting dump1090 from within the container returns permission denied.

I'll gladly take any advice :)

Kevin P.