O'Reilly logo

Building a Home Security System with BeagleBone by Bill Pretty

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

WiFi monitoring

You can see which wireless networks are active in your neighborhood. This is handy if you are monitoring an office environment for Rouge APs installed against the company's policy.

To do this, type the following code in the SSH terminal:

iwlist wlan0 scan

You will see the following code listing:

Cell 01 - Address: 00:11:22:33:44:55
          ESSID:"bills_network"
          Mode:Master
          Channel:11
          Frequency:2.462 GHz (Channel 11)
          Quality=100/100  Signal level:-47dBm  Noise level=- 100dBm
          Encryption key:off
          .
          .
          .

You can see your wireless hub's link quality continuously on the screen by entering the following code:

watch -n 1 cat /proc/net/wireless

Or only once by entering the following code:

cat /proc/net/wireless

Wavemon

Wavemon is a simple ASCII ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required