Wifi Viking assembles a WLAN Pi. This little server is a very powerful WLAN troubleshooting device.
Project website is available @ http://www.wlanpi.com/
Things I have already done…
iPerf
wlan tcpdumps
ethernet tcpdumps
speedtests
curling websites
I ordered mine from https://www.friendlyarm.com/index.php?route=product/product&product_id=189
Paid for DHL delivery. Was quite fast.