feat: add location privacy / GPS blurring#2611
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addresses meshcore-dev#870 and meshcore-dev#1741 by chopping the floating point digits at `(6-blur_digits)`. Tested and running on my Station G2, but should work on all.
When in "blur mode", using the device pubkey, offset the device from the truncated GPS coordinate. This prevents multiple devices from being at the same point. By using modulo we may not be evenly distributed, but they should have decent spread. Here are some examples from one device: ``` gps -> on, active, fix, 7 sats gps blur -> > 3, offset lat+0.000071 lon-0.000310 gps blur 4 -> ok, offset lat+0.000021 lon+0.000040 gps blur 3 -> ok, offset lat+0.000071 lon-0.000310 gps blur 2 -> ok, offset lat-0.003429 lon-0.004810 ```
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addresses #870 and #1741 by chopping the floating point digits at
(6-blur_digits). Tested and running on my Station G2, but should work on all.Using integer math for the truncation.
Further, we're doing deterministic GPS fuzz offsets. When in "blur mode", using the device pubkey, offset the device from the truncated GPS coordinate. This prevents multiple devices from being at the same point.
By using modulo we may not be evenly distributed, but they should have decent spread.
Here are some examples from one device: