How could be notified once USB device is attached/detached in linux system and read the file from USB

I need to be notified once new USB device is attached/detached in Linux system.

And once new device will be attached I need to read the config file("config/conf.xml") and notify to REST API.

I looked into libusb and udev-rules but not sure what is the best way to achieve this.

Please give your view/suggestion on this.

Solution

I'd add udev rule first with running your custom script. Something like:

ACTION=="add", KERNEL=="sd?1", SUBSYSTEMS=="usb", RUN+="/path/to/your/script %k"

%k is kernel parameter that is passed to your script.

From udev man:

$kernel, %k
    The kernel name for this device.

In the script I'd use curl. If you don't need some tricky logic. If so, I'd use python.

Anyway I think udev is perfect for this problem.