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.
Oh I was not clear 64 legal characters the 26 letters of the alphabet X 2 (upper and lower case) 0-9 and "?" , "." but maybe that is just a 6bit fantasy. during discovery bluetooth sends packets back and forth I think we just need to put the message and id in one of those packets. May need more research.
I think ours might too. I need to find low level bluetooth stuff to make it work.