[android-developers] Wifi direct or bluetooth share information without user?

Is it possible that, using any connectivity technology, unknown devices can share information between without the user is controlling it? 

It would be an app where the user previously gives permission to do so, and which information is shareable. Then if 2 or more nearby devices have this app installed, they will share this information by themselves.

So far I ran the sdk demos for bluetooth and wifi direct. I think the discovery process can be automated... in bluetooth at least it's possible to pass 0 to be always discoverable. But still I need to confirm the connection to/from the other devices. Is it possible to skip this?

I have a preference for wifi direct answer because of range and it seems to be better generally.

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