Simple clients signal level measuring

[pekr]

Here is simle script for measuring signal level from clients as seen at the AP radio.

Instalation:
> login using telnet to AP
cd /tmp/local
vi rssi
> press 'a' and paste rssi.txt
> press ESC and enter ':wq'
vi rssi2
> press 'a' and paste rssi2.txt
> press ESC and enter ':wq'
chmod +x rssi*
flashfs save
flashfs commit
flashfs enable

Now the script is saved in flash and you can run it with:
/tmp/local/rssi

Signal level is (probably) updated whenever AP receive packet from client.
I found it usefull for troubleshooting poor radio performace - low signal level from one client makes radio transmit at lower rate whenever it talks to this client.
Maybe Oleg should put something like this in the new FW release?
It would be nice to see the results via web management too ;-)


Here is a little 'screenshot':
-------------------------------------------------------
rate is 54 Mbps
xx:xx:xx:xx:xx:xx -80 ********************
xx:xx:xx:xx:xx:xx -76 ************************
xx:xx:xx:xx:xx:xx -85 ***************
xx:xx:xx:xx:xx:xx -71 *****************************
-------------------------------------------------------
MACs are replaced with xx for some reason.

And yes, this script can be executed remotely via telnet wireless connection to the AP as it doesn't switch off radio.

[tomilius]

Thanks !

[WlanMan]

Hi

Cool thing, no way.
How about reverse lookup in the dhcp table to get IP´s ?

Greets

[Quoing]

Hi
Cool thing, no way. How about reverse lookup in the dhcp table to get IP´s ?
Greets

I modified scripts above a bit. It is single script and it shows also IP address assigned to MAC by dnsmasq.

#/bin/sh

while (true); do
  echo -e "\033[2J" #clear screen
  al=`wl assoclist | sed s/assoclist\ //`
  wl rate #write wifi rate

  for i in $al; do
    echo -n "$i |"
    sig=`wl rssi $i | sed s/rssi\ is\ //`
    if [ $sig -eq "0" ]; then echo -n "     "; sig="N/A";
    else
      if [ $sig -gt "-90" ]; then echo -n "*"; else echo -n " "; fi
      if [ $sig -gt "-80" ]; then echo -n "*"; else echo -n " "; fi
      if [ $sig -gt "-70" ]; then echo -n "*"; else echo -n " "; fi
      if [ $sig -gt "-60" ]; then echo -n "*"; else echo -n " "; fi
      if [ $sig -gt "-50" ]; then echo -n "*"; else echo -n " "; fi
    fi
    echo -n "| $sig | "

    #get IP from dnsmasq dhcp log
    ip=`cat /tmp/dnsmasq.log | grep -i $i`
    if [ "$ip" != "" ]; then
      i=0 #index
      for field in $ip; do
        i=`expr $i + 1` #increment index
        if [ $i -eq "3" ]; then #third field is IP address
          echo $field
        fi
      done
    fi
  done
  sleep 1
done

Output looks like this:

rate is 11 Mbps
XX:XX:XX:XX:XX:XX |*    | -86 | 192.168.1.1
XX:XX:XX:XX:XX:XX |**   | -76 | 192.168.1.2

[britnet]

Nice script!

Thank you

[WlanMan]

Verry well done, thank you !

[sadmax]

How does dhcp table look like?

Cool script!!

[nerodark]

here is a little bug i found while executing rss2:

[root@wl500gx root]$ ./rssi2
 eth1: Invalid argument
rssi    Get the current RSSI val, for an AP you must specify the mac addr of the STA

 [: 0: unknown operand
[: -90: unknown operand
[: -80: unknown operand
[: -70: unknown operand
[: -60: unknown operand
[: -50: unknown operand

what i had at this moment was: wl ap = 1
now i turned it off: wl ap = 0
then it worked

maybe update your script by adding the line:
if [ -z ${rssi} ] ; then exit ; fi
right after the first set of the variable rssi, to prevent this error or turn ap off on script startup

thanx

[Miki]

Here is simle script for measuring signal level from clients as seen at the AP radio.

Nice idea!

I took the liberty of speeding up rssi2 and adding support for WDS peers to rssi.

rssi2 is now easily fast enough to do a simple 'sat-finder' type running display, nice for aligning antennas. This is in rssitest.

Upload the same way as in pekr's post