v1.6.20

Added

• WH54 liquid depth sensor support: WH54 channels (1–4) registered devices in Home Assistant but produced zero entities because the ch_lds livedata array was never parsed — the same phantom-device shape as the WH69 fix in v1.6.18/v1.6.19. The coordinator now reads ch_lds, mapping each channel's air → lds_air_ch{N} (mm), depth → lds_depth_ch{N} (mm), voltage → lds_voltage_ch{N} (V), and battery → lds_batt{N} (converted from the 0–5 scale to percentage). The WH54 device is now labelled "Liquid Depth Sensor" and treated as outdoor. (issue #164)
• PM2.5 AQI entities for WH41: The ch_pm25 block exposes both real-time and 24-hour AQI indices (PM25_RealAQI, PM25_24HAQI), but the integration previously dropped the real-time AQI entirely and misused the 24-hour AQI as a µg/m³ concentration on the pm25_avg_24h_ch{N} entity. Two new entities are now created per channel: pm25_aqi_realtime_ch{N} and pm25_aqi_24h_ch{N}, both with unit AQI (dimensionless 0–500). (issue #158)
• Feels Like Temperature and VPD now attach to outdoor weather stations: The "3" (Feels Like) and "5" (VPD) decimal-string IDs in common_list had SENSOR_TYPES metadata but were never wired into a device's hex-ID list, so they registered as orphan entities on the gateway device. Both IDs are now part of the WH69, WH80/WS80, WH90, and WS90 key lists, and they attach to the outdoor sensor that calculates them. (issue #173)

Fixed

• WH51 soil moisture battery showed 0% for healthy sensors: Per spec V1.0.6 §7, WH51 (ch_soil) battery uses the same binary encoding as WH31 (ch_aisle) — 0 = normal, 1 = low — but the ch_soil handler converted "0" to 0% via the universal *20 formula, making fully-charged sensors look dead. The handler now matches ch_aisle: "0" → 100%, "1" → 10%, and "2"–"5" continue to use the 0-5 bar *20 conversion that some firmwares emit. (issue #174)
• PM25_24HAQI no longer misused as concentration: Previously, when a gateway emitted only PM25_24HAQI (an AQI index, dimensionless 0–500), it was stored on the pm25_avg_24h_ch{N} entity with unit µg/m³ — visually conflating an AQI of 82 with a concentration of 82 µg/m³. PM25_24HAQI now populates the new pm25_aqi_24h_ch{N} AQI entity instead. The pm25_avg_24h_ch{N} concentration entity continues to be populated by the genuine concentration fields (pm25_avg_24h, pm25_24h) when emitted. (issue #158)

Changed

• Removed unused decimal-id "4" (Apparent Temperature) sensor type: This SENSOR_TYPES entry was a developer error — "4" is not defined anywhere in the V1.0.6 spec (which uses "3" for Feels Like and "5" for VPD; "0x04" is Wind Chill, a separate hex ID). The dead entry has been removed along with its placeholder slot in GATEWAY_SENSORS. (issue #173)