Devices: Samsung Galaxy S7, Samsung Galaxy Tab S2
Controller: Logitech Gaming F710 Wireless Gamepad Via OTG
Working: Yes ON DIRECT INPUT ONLY (on xinput nothing works at all so you can kiss xbox 360 and xbox one controllers good bye until support is added), BUT the Right Trigger (R2 / RT) and Left Trigger (L2 / LT) are not recognized (all other buttons are however).
Jailbreak or Root: No

NOTE: Placed links so people can learn the terms (for those people that are ignorant of the terms) and also for the devices too.

http://www.minecraftforum.net/forums/minecraft-pocket-edition/mcpe-discussion/2522049-minecraft-pe-controller-support-list?comment=44

On a side note a different app DOES recognize the trigger buttons which i will attach screenshots of.
104 is Left Trigger (L2 / LT) and 105 is Right Trigger (R2 / RT)

Also Game mode doesn't matter as the entire app is affected even in the controller setup on the main menu.