This app did what I needed – iPerf3 Performance Test Tool Review

It worked for me. I ran it on an iPad 4th gen running IOS9 connecting to an iPerf3 server. I used it about 15 times, and 14/15 times it worked perfectly. One time it spit out errors, but restarting the app fixed it. The interface is fine if you already know iPerf.
Review by GreenSoju on iPerf3 Performance Test Tool.