Hello.

Hope it's not too OT here (suggestions for other lists welcome!).

I'm going to develop a project where I have to handle MANY plug/unplug 
events of devices with the same ID (and just a different ser#).
Think an "access key" that the user plugs to open a door:
1) the user plugs the key
2) the system reads some data
3) the system updates key data
4) the system opens the door when user unplugs key

How do I get the "plug" event (and "unplug" too...) ?
Are there some docs I couldn't find?
As you may think the system is quite resource-constrained, so the less 
sw is installed, the better.

Tks,
  Diego.

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