Add support for HomeKit (#12488)

* Basic Homekit support

* Added Temperatur Sensor
* Added Window Cover

* Code refactored

* Added class HomeAccessory(Accessory)
* Added class HomeBridge(Bridge)
* Changed homekit imports to relative, to enable use in custom_components
* Updated requirements
* Added docs
* Other smaller changes

* Changed Homekit from entity to class

* Changes based on feedback
* Updated config schema
* Add only covers that support set_cover_position

* Addressed comments, updated to pyhap==1.1.5

* For lint: added files to gen_requirements_all
* Added codeowner

* Small change to Wrapper classes

* Moved imports to import_types, small changes

* Small changes, added tests

* Homekit class: removed add_accessory since it's already covered by pyhap
* Added test requirement: HAP-python
* Added test suit for homekit setup and interaction between HA and pyhap
* Added test suit for get_accessories function

* Test bugfix

* Added validate pincode, tests for cover and sensor types

homeassistant/components/homekit/sensors.py

@@ -0,0 +1,50 @@
+"""Class to hold all sensor accessories."""
+import logging
+
+from homeassistant.const import STATE_UNKNOWN
+from homeassistant.helpers.event import async_track_state_change
+
+from . import TYPES
+from .accessories import HomeAccessory
+from .const import (
+    SERVICES_TEMPERATURE_SENSOR, CHAR_CURRENT_TEMPERATURE)
+
+
+_LOGGER = logging.getLogger(__name__)
+
+
+@TYPES.register('TemperatureSensor')
+class TemperatureSensor(HomeAccessory):
+    """Generate a TemperatureSensor accessory for a temperature sensor.
+
+    Sensor entity must return either temperature in °C or STATE_UNKNOWN.
+    """
+
+    def __init__(self, hass, entity_id, display_name):
+        """Initialize a TemperatureSensor accessory object."""
+        super().__init__(display_name)
+        self.set_category(self.ALL_CATEGORIES.SENSOR)
+        self.set_accessory_info(entity_id)
+        self.add_preload_service(SERVICES_TEMPERATURE_SENSOR)
+
+        self._hass = hass
+        self._entity_id = entity_id
+
+        self.service_temp = self.get_service(SERVICES_TEMPERATURE_SENSOR)
+        self.char_temp = self.service_temp. \
+            get_characteristic(CHAR_CURRENT_TEMPERATURE)
+
+    def run(self):
+        """Method called be object after driver is started."""
+        state = self._hass.states.get(self._entity_id)
+        self.update_temperature(new_state=state)
+
+        async_track_state_change(
+            self._hass, self._entity_id, self.update_temperature)
+
+    def update_temperature(self, entity_id=None, old_state=None,
+                           new_state=None):
+        """Update temperature after state changed."""
+        temperature = new_state.state
+        if temperature != STATE_UNKNOWN:
+            self.char_temp.set_value(float(temperature))