Expose USB from addon

Hi guys,

I’m trying to migrate my nodejs server for controlling addressable led strips. I created the addon and the server is running, but it can’t connect to the arduino over the usb.
The server is using http://johnny-five.io/ and I added explicitly the port location, like {port: '/dev/ttyACM1';}, but when the addon starts I receive the following error:
No such file or directory, cannot open /dev/ttyACM1

How can I expose the USB ?