feat: self-calibrate the falling-back floor from the group's live RSSI baseline - #15
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…I baseline
The falling-back floor used to be a fixed dBm value picked by hand via the
Sensitivity setting -- the right number depends on terrain, group size and
antenna placement and changes every ride, making field calibration slow and
imprecise. The floor now derives automatically as `baseline - margin`, where
the baseline is the median slow-EMA RSSI across the intact group (see
src/calibration.{h,cpp}), falling back to the historical fixed -105 dBm floor
until at least 2 peers are present to calibrate against. Sensitivity 0-10
keeps its familiar ruler but now sets the margin (0-30 dB) below that
baseline instead of an absolute dBm number.
To make the calibration observable in the field: the range-test screen now
also shows the live baseline/floor/trend per peer, and a new opt-in onboard
trace ring buffer (`trace on/off/dump/clear` on the serial console) records
raw/fast/slow RSSI plus baseline/floor for post-ride CSV analysis.
No wire-format change (Protocol::kVersion untouched) and no NVS migration --
the `sensLvl` key and the `status` console output stay exactly as before.
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Summary
floor = group_baseline - margin, where the baseline is the median slow-EMA RSSI across the intact group (src/calibration.{h,cpp}, pure/testable). Falls back to the historical fixed −105 dBm floor until ≥2 peers are present to calibrate against.trace on/off/dump/clearon the serial console, PSRAM-backed with a RAM fallback) for post-ride CSV analysis of raw/fast/slow RSSI + baseline/floor.Protocol::kVersionuntouched), no NVS migration —sensLvlkey andstatusconsole output unchanged (Flasher settings panel unaffected).Test plan
pio test -e native— 78/78 passing, including 16 new tests forcalibration.h(median robustness/outlier resistance, floor clamping, fallback, margin mapping)pio run— firmware builds clean (RAM 7.2%, Flash 10.8%)flasher/flasher.py --check— flasher self-test passes🤖 Generated with Claude Code