Xiaomi Vacuum as "template fan" for Home Assistant/HomeKit. The fan slider (0-100) in HomeKit will be translated to the the corresponding vacuum presets or speeds (off, Silent, Standard, Medium, Turbo).

xiaomi_fan_configuration.yaml

# Xiaomi HomeKit
fan:
  - platform: template
    fans:
      xiaomi_fan:
        friendly_name: "Xiaomi Vacuum"
        value_template: "{%if states('vacuum.xiaomi_vacuum_cleaner') == 'cleaning' %}on{%elif states('vacuum.xiaomi_vacuum_cleaner') == 'paused' %}on{%else %}off{% endif %}"
        speed_template: "{{ state_attr('vacuum.xiaomi_vacuum_cleaner', 'fan_speed') }}"
        turn_on:
          service: vacuum.start
          entity_id: vacuum.xiaomi_vacuum_cleaner
#       turn_on:
#         service: xiaomi_miio.vacuum_clean_zone
#         data_template:
#           entity_id: vacuum.xiaomi_vacuum_cleaner
#           repeats: 1
#           zone: [[18724,22506,25440,24620],[23758,20813,24906,22506]]
        turn_off:
          service: vacuum.return_to_base
          entity_id: vacuum.xiaomi_vacuum_cleaner
        set_speed:
          service: vacuum.set_fan_speed
          data_template:
            fan_speed: "{{ speed }}"
            entity_id: vacuum.xiaomi_vacuum_cleaner
        speeds:
          - 'off'
          - 'Silent'
          - 'Standard'
          - 'Medium'
          - 'Turbo'
#         - 'Gentle'

sensor:
  - platform: template
    sensors:
      xiaomi_fan:
        unit_of_measurement: '%'
        value_template: "{{ state_attr('vacuum.xiaomi_vacuum_cleaner', 'battery_level') }}"

homekit: 
  entity_config:
   fan.xiaomi_fan:
     linked_battery_sensor: sensor.xiaomi_fan

Doesnt work anymore.

Deprecated services: fan.set_speed
source: https://www.home-assistant.io/integrations/fan/

Does anyone have a working config for Homekit with latest HA versions?