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Calibration

[email protected] seems incorrect

[email protected] is broadcast in the beacons from "ibeacon:*,altBeacon:* and eddy:*" devices. So if those are not correct you need to fix the beacon to send the correct value.

For all other devices [email protected] is the setting image plus an offset to correct for broadcast power. See https://github.com/ESPresense/ESPresense/blob/master/lib/BleFingerprint/rssi.h for the exact values.