A tiny Linux command-line tool to make WLAN frames audible.
beeper <options> <source MAC address>
-I <device> device to use (mandatory, device must be in monitor mode)
-c <count> expected frames/second to estimate PRR (optional, default = 10)
$ sudo iw phy phy0 interface add mon0 type monitor
$ sudo ifconfig mon0 up
$ sudo iw mon0 set channel 6
$ sudo ./beeper -I mon0 00:11:22:33:44:55
This will set-up a monitor-mode WLAN interface and configure it to listen on channel 6. Beeper is then configured to listen (beep) for beacon frames from an access point with MAC address 00:11:22:33:44:55. Be sure to stop other programs from fiddeling with your WLAN interface (e.g. NetworkManager).
This tool was kludged tother in one afternoon. Bear with me ;-) and report bugs to till wollenberg uni-rostock de.
Beeper works only with WLAN drivers which use the mac80211 stack and support monitor mode plus Radtiotap headers. It also uses the ancient KIOCSOUND ioctl() to beep the PC speaker. This will not work on systems lacking such a device and may also fail on modern systems. Using ALSA or PulseAudio for sound output is on my list.