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What's the upper limit though? Wouldn't a half dozen devices placed at known coordinates around the house be enough to do indoor GPS?

There's 6 channels, and I think a high / low setting to get a total of 12.

With indoor positioning, the anchors aren't positioned as precisely as GPS satellites, nor do they have the same quality clocks. Thus time of flight is done with a call and response per device.

It was hard to setup positioning for more than 1x device... remember that 1x device is range finding to 4x anchors.

Am sure these problems can be solved, but in the near term think this is more about precise distance rather than position.

Could you give some rough numbers? The definition of "a few" varies heavily depending on the context.

you’d think hundred of devices could share a same channel though. duty cycle is really small.