Doesn't work on (my?) X server (but works in normal terminal)

[Ten0]

Hello,
I'm trying to use fauxcon as a virtual keyboard on my Ubuntu 16.04.

When I create the virtual keyboard (sudo fauxcon -C) and leave it running, it's listed in my xinput devices :

> xinput
...
    ↳ Faux Keyboard                           	id=16	[slave  keyboard (3)]

It is also marked as enabled :

> xinput list-props 16
Device 'Faux Keyboard':
	Device Enabled (139):	1
	Coordinate Transformation Matrix (141):	1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
	Device Product ID (260):	38466, 3341
	Device Node (261):	"/dev/input/event15"

But none of the inputs are transmitted to the X server.
If i'm in a basic terminal however (Ctrl+Alt+F[1-6]), it does work.

Is there any particular configuration that should be done for it to work ?

Thanks in advance,

NB: Yes I did change the name of the virtual input device to remove the (TODO: & Keyboard) part, the rest of the code being latest master (0794dad).