Tools for troubleshooting wireless problems. * log access point in use * monitor access point changes * scan and test all access points

ap-watch.sh

sudo watch -d -n 10 'wpa_cli -i wlan0 status | sed -n "s/.*bssid=\(.*\).*/\1/gp"'

choose-ap.sh

#!/bin/bash
ap=$1
echo Connecting to $ap ...
sudo wpa_cli -i wlan0 bssid 0 $ap > /dev/null
sudo wpa_cli -i wlan0 reassociate > /dev/null
sleep 4
STATUS=`sudo wpa_cli -i wlan0 status`
CONNECTED_TO=`echo "$STATUS" | sed -n "s/.*bssid=\(.*\).*/\1/gp"`
if [[ "$ap" == "$CONNECTED_TO" ]]; then
	echo "Connected"
else
	echo "Failed to connect to $ap"
fi
echo

log-wireless.sh

#!/bin/sh
MAC=`sudo iwconfig wlan0 | sed -n 's/.*Access Point: \(.*\)$/\1/gp'`
echo $MAC $1 `date` >> hitlist.txt
echo $MAC $1

summarize.sh

#!/bin/sh
egrep '(bssid|loss|rtt)' $1 | awk 'BEGIN {print "bssid\tpacket_loss\tavg_ping_ms"} {print $0}'

test-access-points.sh

#!/bin/bash
echo Generated by https://gist.github.com/timabell/6978970
# bash not sh to get case insensitive compare for mac http://stackoverflow.com/a/1728814/10245
shopt -s nocasematch
SSID=`sudo iwconfig wlan0 | sed -n 's/.*ESSID:"\(.*\)".*/\1/gp'`
echo Checking access points for ssid $SSID ...
echo -n
AP_LIST=`sudo iwlist wlan0 scan essid $SSID | awk '{ if ($0 ~ /Cell/) {printf $5} else if ($0 ~ /Quality/) {print} }' | sort`
echo "$AP_LIST"
echo
APS_BY_STRENGTH=`echo "$AP_LIST" | awk '{print $4 " " $5 " " $1}' | sort -n`
echo "Ordered by strength:"
echo "$APS_BY_STRENGTH"
MAC_LIST=`echo "$APS_BY_STRENGTH" | awk '{print $3}'`
echo

for ap in $MAC_LIST
do
	echo Connecting to $ap ...
	sudo wpa_cli -i wlan0 bssid 0 $ap > /dev/null
	sudo wpa_cli -i wlan0 reassociate > /dev/null
	sleep 4
	STATUS=`sudo wpa_cli -i wlan0 status`
	CONNECTED_TO=`echo "$STATUS" | sed -n "s/.*bssid=\(.*\).*/\1/gp"`
	if [[ "$ap" == "$CONNECTED_TO" ]]; then
		ping -c 30 -i 0.2 -s 1024 ic.ac.uk | egrep 'loss|rtt'
	else
		echo "Failed to connect to $ap"
	fi
	echo
done
echo done