OSX Wifi

A quick and dirty script to put in your crontab to see what the hell is going on! MacBook Airs act funny with power management and their SNR. Also, with the RSSI and noise floor you can just subtract the noise to get the SNR. At the end of the day though it's the SINR that counts + proper tools are required to diagnose non-802.11 interference, CCI, ACI, throughput and retries....

	#!/usr/bin/env bash
	# Remember to change the "Podomere" SSID to name grab your preferred/connected SSIDs
	# Also update the default gateway!
	# Change to a SpeedTest server near you from http://www.speedtest.net/speedtest-servers.php
	# Pick a small file http://lowendtalk.com/discussion/2178/speed-test-files-1-300-locations
	# And run this file from a wifitest directory and put it in your crontab for every minute!
	# Note: add your BSSID,APname in to a file called "bssidsapnames.txt" in the same directory!!
	# Yes this is a quick and nasty script! All improvements welcome including shortening :)
	# To simply call airport commands you can sym link the Apple OSX airport binary to somewhere
	# in your existing path e.g.
	# "sudo ln -s /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport \\
	# /usr/sbin/airport"
	# Note: On OSX you can use "system_profiler -listDataTypes" to get fun info!
	# Also PLEASE NOTE that this generated data then becomes very easily parsed with standard unix tools e.g
	# to get SNR you can just do this... or indeed another simple grep/egrep for 'noise' etc.
	# egrep -hi signal /Volumes/dat1/wifitest/debugging/wifitest_2014-09-27* | awk '{sum = $5 - $8; print $1" " $5" " $8" SNR:" sum}'
	# Please amend any file or user paths for your own system and then place the script in cron for every minute and you will
	# have continual performance monitoring which you can easily graph or ask questions of with basic ubiquitous tools.
	# See some of the other gists above to simply graph or alert on conditions...
	now=$(date +%Y-%m-%d_%H.%M.%S)
	file="/Users/Account/wifitest/wifitest_$now.txt"
	touch "$file"
	if [ ! -f "/Users/Account/wifitest/bssidsapnames.txt" ]; then
	touch "/Users/Account/wifitest/bssidsapnames.txt"
	fi
	function stamp {
	sed -e "s/^/$(date +%Y-%m-%d_%H.%M.%S) /" | tee -a "$file"
	}
	echo "======NewFile======" | stamp
	for i in {1..5}
	do
	echo "======Begin=======" | stamp
	/usr/sbin/system_profiler SPAirPortDataType | egrep -i "Status:|PHY Mode:|en:|Channel:|Country|Signal|Rate:|Index:" | sed 's/^[ \t]*//;s/[ \t]*$//' | stamp
	bssid=`/System/Library/PrivateFrameworks/Apple80211.framework/Resources/airport -I | egrep -i "BSSID" | sed 's/^[ \t]*//;s/[ \t]*$//' | awk '{print $2}'`
	#bssid=`/usr/sbin/system_profiler SPAirPortDataType | egrep -i "BSSID" | sed 's/^[ \t]*//;s/[ \t]*$//' | awk '{print $2}'`
	/usr/sbin/airport -I | egrep -i " SSID:|maxRate:" | sed 's/^[ \t]*//;s/[ \t]*$//' | stamp
	#echo "BSSID: $bssid" | stamp
	echo "$bssid" | awk 'FNR==NR{a[$1]=$2;next}{print "Access Point Name: " a[$1]}' FS=',|;' OFS=',' /Users/Account/wifitest/bssidsapnames.txt - | stamp
	/usr/sbin/system_profiler SPPowerDataType | egrep -i "Charging:|Amperage|Voltage|Connected|Wattage" | sed 's/^[ \t]*//;s/[ \t]*$//' | stamp
	/usr/sbin/ioreg -w 0 -l | egrep -i "\"voltage|cellvoltage" | sed 's/|//g;s/^[ \t]*//;s/[ \t]*$//' | stamp
	echo "======Router_ICMP_Ping======" | stamp
	/sbin/ping -A -c3 -i1 -t3 10.1.1.1 | tail -n2 | stamp
	echo "======Google_ICMP_Ping======" | stamp
	/sbin/ping -A -c3 -i1 -t3 google.com | tail -n2 | stamp
	echo "======Google_Homepage=======" | stamp
	curl -L -s -o /dev/null -w 'DNSLookup:%{time_namelookup}ms Total:%{time_total}ms Speed:%{speed_download} Bytes p/s(times 8 for bps) Data:%{size_download} Bytes' http://google.com/ | stamp
	done
	echo "====TelstraSpeedTestFile===" | stamp
	curl -L -s -o /dev/null -w 'DNSLookup:%{time_namelookup}ms Total:%{time_total}ms Speed:%{speed_download} Bytes p/s(times 8 for bps) Data:%{size_download} Bytes' http://per1.speedtest.telstra.net/speedtest/random350x350.jpg | stamp
	echo "==== LOCAL SCAN ===========" | stamp
	/System/Library/PrivateFrameworks/Apple80211.framework/Resources/airport -s | sort -k3 | sed -e "s/^/$(date +%Y-%m-%d_%H.%M.%S) Scan~/" | tee -a "$file"
	echo "=====EndFile======" | stamp

view raw wifi.sh hosted with ❤ by GitHub

## Then put the below in your crontab for every minute (with your own path of course)…
* * * * * /Users/useraccount/wifitest/wifi.sh > /dev/null 2>&1