ATF Device is a commercial application. It is used for running multiple types of traffics in a multiple devices to test the performance of an access point.
This application is designed to connect to our Swat ATF product. This product runs a central server which sends commands to the application to perform few traffics such as IPerf downlink and uplink, FTP download and upload, Browsing a webpage, Video Streaming, Youtube Streaming, etc and then it generates the traffic report for each traffic with required performance metrics.
Swat ATF is a part of enterprise test setup which supports to run traffics in both desktop and mobile operating systems.
More details of the product here.
https://alethea.in/swat-wicheck-6-atf/