MIELHVAC New features and bug fixes

[grzegorz914]

Bug Fixes

Memory leak in miel_hvac_pre_init() — on serial init failure, goto del jumped past free(sc), leaking the allocated state struct. Replaced with explicit delete sc->sc_serial; free(sc); return;.

remotetemp_clear semantics inverted — the variable was initialised true and caused a CLR frame to be sent on boot before any sensor had registered. Renamed to remotetemp_active, initialised false, and CLR is only sent after an active SET.

HVACSetPurify used wrong map — was passing airdirection_map instead of purifier_map.

0x08 Set Run State flags byte order — flags are little-endian on the wire (ref: muart-group/muart-group.github.io#17). Removed htons() from all 0x08 flag operations.

widevane_isee false positives — values like 0x84/0x85/0x8c (ISEE bit + physical position nibble) were incorrectly reported as AirDirection:"even". Reverted to exact-match for known active values (0x80, 0x28, 0xaa).

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New Features

Base Capabilities query (0x5B 0xC9) — after connecting, the driver sends an Identify Request and parses the 0x7B 0xC9 response into a capability struct. Exposed as *Supported fields in the MiElHVAC JSON object.

HVAC Options polling (0x42) — new miel_hvac_data_hvac_options struct and request type. Polls Purifier, NightMode and EconoCool state. Sent with len=1 (short request form). Units without cap_run_state skip this slot entirely to avoid timeouts.

Run State commands (0x41 0x08) — added HVACSetPurify, HVACSetNightMode, HVACSetEconoCool and HVACSetAirDirection routed through command 0x08 on units that report cap_run_state=true. Optimistic local update applied before confirmation.

EconoCool — 0x08 byte 14, flag 0x10, COOL mode only. Command HVACSetEconoCool on|off.

i-See runtime detection — new sc_has_isee flag set when widevane shows i-See state (0x80 bit or values 0x28/0xaa). Used to distinguish units with vertical vane + i-See from units with vane only.

Capabilities-aware command validation — commands are blocked before send when the unit reports a feature unavailable:

• HVACSetMode/HVACSetHAMode — blocks heat/dry/fan when unsupported (ISEE variants share parent mode bit)
• HVACSetTemp — narrows range using unit-reported min/max per mode
• HVACSetFanSpeed — blocks AUTO without cap_fan_auto, QUIET without 5 speeds, FAN_4 without 4 speeds
• HVACSetPurify/HVACSetNightMode/HVACSetEconoCool — return NotSupported without cap_run_state
• HVACSetAirDirection — returns ControlNotSupported when vane+i-See present but no run state

Web UI rows for Power and Energy — added FUNC_WEB_SENSOR handler via WSContentSend_PD showing instantaneous power (W) and cumulative total (kWh) on the Tasmota main page.

miel_hvac_append_settings_json() — shared JSON builder used by both HVACSETTINGS and SENSOR topics.

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JSON Changes

• Power (W) and Energy (kWh) now published both inside MiElHVAC and in a standard Tasmota ENERGY{} sub-object (Power/Total) for Home Assistant auto-discovery.
• Purifier, NightMode, EconoCool shown in MiElHVAC and HVACSettings when cap_run_state=true, otherwise omitted.
• AirDirection hidden from MiElHVAC and HVACSettings when the unit lacks a vertical vane or has no observed i-See sensor.
• New flat fields in MiElHVAC from Base Capabilities: ModeHeatSupported, ModeDrySupported, ModeFanSupported, VaneVSupported, SwingSupported, FanAutoSupported, OutdoorTemperatureSupported, AirDirectionSupported, PurifierSupported, NightModeSupported, EconoCoolSupported, SetTemperatureCoolMinMax, SetTemperatureHeatMinMax, SetTemperatureAutoMinMax, CapabilitiesHex.
• Values on / off / not_supported / control_not_supported.
• AirDirectionSupported reports:
  • not_supported — no vertical vane, or no i-See observed
  • control_not_supported — vane + i-See present but unit does not support 0x08 Set Run State
  • on — full support
• OptionsHex added for the 0x42 HVAC Options packet.

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Tested on

MSZ-LN25VG2W — cap_run_state=false, temperature ranges 16–31 °C (cool/auto) and 10–31 °C (heat), 5 fan speeds, outdoor temperature reporting confirmed.

Checklist:

• The pull request is done against the latest development branch
• Only relevant files were touched
• Only one feature/fix was added per PR and the code change compiles without warnings
• The code change is tested and works with Tasmota core ESP8266 V.2.7.8
• The code change is tested and works with Tasmota core ESP32 V.3.1.11 / V.3.3.8
• I accept the CLA.

NOTE: The code change must pass CI tests. Your PR cannot be merged unless tests pass