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the two issues you prolly already know.
1. to use bluetooth it has to be visible.
2. some phones may require manual linking. possible solutions to problem 1.
the app controlling visibility using a pseudo-random algorithm based on the clock. i.e. all the phones running the app turn on at seemingly random intervals talking to each other then disappearing. problem 2 is troubling
but I think I can solve it by shoving the info thru the capabilities.
especially if we limit the usable characters to 64.
the cool bit is that it would look like the phones are not even syncing up.