Are you talking about the Marshmallow update or FoxFi update? If you're on Verizon (which I assume you are since you mentioned UDP) you should be fine either way. But to be on the safe side I would suggest taking a look at the FoxFi changelog notes on the Play Store. One of the good things about FoxFi is that the developers keep their notes thoroughly updated.
Good luck!
Gotcha. You should be fine. Per changelog notes re FoxFi WiFi mode:
---Verizon Samsung phones (S3/4/5/6/7/Edge, Note 2/3/4/5 etc.) , Verizon LG phones (V10, G2/3/4/5 etc.) and Verizon Sony phones (Z2/Z3) are supported by all Android versions including Android 6.0/6.1.