Hack 33 Link Monitoring in Linux with WavemonMonitor radio parameters in real time using Wavemon, a curses-based tool for Linux. When using Linux, the standard wireless tools provide a wealth of status information. These tools get their information from the standard kernel interface /proc/net/wireless. While ideal for providing pinpoint accuracy in measuring signal strength and noise data, these tools are not designed to give an indication of performance over time. Wavemon (http://www.wavemage.com/projectsl) is a terrific little tool that does precisely this. It polls /proc/net/wireless many times each second to give you a rolling report of how your wireless connection is performing. Its simple curses interface keeps the code quite small, and is ideal for including in embedded distributions (such as Pebble [Hack #53]) to get real-time link data from remote access points.The main interface provides a nice graphical representation of the current link state (Figure 3-29). Figure 3-29. Wavemon in action.All of the statistics are updated in real time, making it ideal for monitoring point-to-point links and fine-tuning antennas on long distance shots. For an even easier to read display, hit F2 to bring up the Level Histogram (Figure 3-30). Figure 3-30. Pretty little scrolling waves of data.This display is easy to read on a laptop even in bright sunshine, making it an ideal tool for outdoor work. The histogram slowly sweeps to the left, giving you a history of the last few moments of wireless connectivity. Since Wavemon runs in a terminal, you can easily run more than one instance to monitor multiple radio links simultaneously.When you need a high performance signal and noise meter for Linux, Wavemon is hard to beat. The current version is available from Freshmeat at http://freshmeat.net/projects/wavemon/. |
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