[Most] laptops can direct-connect, because most can share their WIFI (P2P) and be connected directly to.
I do not believe any of the phones can run in Infrastructure mode like that, so your only options would be BT or something with a central server.
I have been kicking around the idea of a similar app, only something more akin to "omni-presense" for Android devices in general. I would use our server farm as a communication hub.
FWIW, servers are cheap; bandwidth is cheap.
Scott
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