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I need a starting point to my Android project, for me this will be a big help. because my idea is based on transferring files between android devices.
WiFi Direct Doesn’t uses HotSpot Connection
It doesn't looks like a valid question for forum like this but you could have searched that in Google or quora to see what people say.
Here is one of such link, check if it helps-
What technology does the Xender app uses to transfer files? What makes it so fast? - Quora
Hope, it helps