devd software package provides device state change monitoring daemon, you can install in your Debian 7 (Wheezy) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install devd
devd is installed in your system.
Make ensure the devd package were installed using the commands given below,
$ sudo dpkg-query -l | grep devd *
You will get with devd package name, version, architecture and description in a table
| Distro | Debian 7 wheezy |
| Section | Administration Utilities |
| Package | devd |
| Version | 9.0+ds1-11~deb7u1 |
| Description | device state change monitoring daemon |
| Sub Section | Admin |