Hi,
your device is listed so that should be okay!.
Bus 001 Device 005: ID 7392:7811 Edimax Technology Co., Ltd EW-7811Un 802.11n Wireless Adapter [Realtek RTL8188CUS]
Try installing the following package:
sudo apt-get install ap-utils
Access Point SNMP Utils for Linux
A set of utilities for remotely administrating a variety of wireless access points via SNMP:
- ap-auth - update authentication list
- ap-config - interactively configure or get statistics from devices that support MIB-II, IEEE 802.11 MIB or NWN DOT11EXT MIB and most Atmel-chipset based APs
- ap-gl - interactively configure or get statistics from
Atmel Prism-based APs - ap-mrtg - get statistics from an AP in MRTG format
- ap-rrd - get statistics from an AP in RRDtool format
- ap-tftp - update AP firmware by TFTP
- ap-trapd - receive, parse and log trap messages from an AP
I hope it helps!. 