My friend Steve Lord recently introduced me to ultra portable GL-inet routers. I picked up the $25 GL-AR150 to hack around on.
One of the first things I noticed while reading through their blog was that the hardware was the same as the wifipineapple nano and someone had already ported the firmware to work on the AR150.
Updating the firmware is as simple as logging in and uploading this file. Once you do it is as simple as logging in and setting it up: 
Here is are a couple of good guides on how to configure it:
The WiFi Pineapple Mark V – Introduction and Setup
WiFi Nano Setup
I plan on using this to do some continual AP and client monitoring around my house.
I have a few more projects on this platform that I will be posting about soon.
Turning a $25 GL-AR150 into a $100 WifiPineapple
