Humidity sensor is not displayed in HomeKit

[envy]

Description of problem:

I have a humidity sensor that sends onto the KNX bus every 10 sec. This works fine and is also picked up fine in Home-Assistant.

However, the sensor is not displayed in HomeKit, possibly because Home-Assistant does not see it as a humidity sensor. The HomeKit documentation says this for humidity sensors:
"All sensors that have % as their unit_of_measurement and humidity as their device_class." (https://www.home-assistant.io/components/homekit/)

I also have a temperature sensor on KNX that works fine in HomeKit because the HomeKit documentation says this: "All sensors that have Celsius or Fahrenheit as their unit_of_measurement or temperature as their device_class."

Emphasis mine both times.

It seems that xknx is not specifying the device_class for its sensors and therefore HomeKit picks up only the temperature sensor (because it's measuring °C) but not the humidity sensor.

• using xknx standalone
• using Home-Assistant knx plugin

Version information:

• xknx / Home-Assistant release with the issue: 0.90.1
• last working xknx / Home-Assistant release (if known): N/A

KNX installation:
Mainly ABB and some selfmade KNXnet/IP devices using my ESP8266 library

Problem-relevant xknx.yaml or configuration.yaml entries (fill out even if it seems unimportant):

sensors:
  - platform: knx
    name: wznico.temp
    type: temperature
    address: '0/1/1'
  - platform: knx
    name: wznico.hum
    type: humidity
    address: '0/1/2'

Traceback (if applicable):

[amp-man]

I also think it would be great if xknx would set the device_class.
@envy: As a quick fix, you could put something like this in your customize.yaml:

sensor.kitchen_humidity:
  device_class: humidity