This raises the bar quite a bit. I'm sure there are others who might have existing resources that are better-suited. Security is an issue here. In a Phase 1 network, individual nodes can attempt to make things somewhat more secure for themselves by allowing only particular MACs, particular SSIDs, or both. In a Phase 2 network, things are substantially the same, until we get to Option 3.
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Things to do One of the first things to do is to build a map, to see just how densely-populated we are and therefore whether the resulting cells are touching or widely separated. I'm thinking of a scanned-in version of the ubiquitous maps of Somerville handed out by the local city precincts, out to some radius around Davis Square. Something that will look better on a web page than the typical results of a scan would be nice. Please fill out this survey so we can get an idea of coverage, see above for how we'll use this information. We also need various answers on compatibility amongst various vendors.