Merge "Document how HVAC_AUTO_ON can be indirectly disabled" into udc-dev

    HVAC_DUAL_ON = 0x0509 + 0x10000000 + 0x05000000

            + 0x00200000, // VehiclePropertyGroup:SYSTEM,VehicleArea:SEAT,VehiclePropertyType:BOOLEAN

    /**

     * On/off automatic mode

     * On/off automatic climate control.

     *

     * If true, automatic climate control is on. If false, automatic climate control is off.

     *

     * If the vehicle does not support directly turning off automatic climate control, then OEMs

     * should add logic in their VHAL implementation so that setting HVAC_AUTO_ON to false would

     * change the necessary HVAC settings to indirectly turn off HVAC_AUTO_ON. Ideally, this should

     * not be disruptive to the user, so OEMs should change back to the previous state any settings

     * that were modified once automatic climate control is off. That way the only outcome should be

     * that HVAC_AUTO_ON is off. If restoring the HVAC settings to its previous settings is not

     * possible, then the OEM should choose the least disruptive change and implement that.

     *

     * This property is defined as VehiclePropertyAccess.READ_WRITE, but OEMs have the option to

     * implement it as VehiclePropertyAccess.READ only.