Add switch platform for Danfoss Air and additional sensors. (#21046)

* Add switch platform for Danfoss Air and additional sensors.

* Solve lint issues.

* Correct style.

* Minor changes

* Minor changes

* Minor changes

* Update file header

* Remove space

* Remove space

homeassistant/components/danfoss_air/switch.py

@@ -0,0 +1,72 @@
+"""Support for the for Danfoss Air HRV sswitches."""
+import logging
+
+from homeassistant.components.switch import (
+    SwitchDevice)
+from homeassistant.components.danfoss_air import DOMAIN \
+     as DANFOSS_AIR_DOMAIN
+
+_LOGGER = logging.getLogger(__name__)
+
+
+def setup_platform(hass, config, add_entities, discovery_info=None):
+    """Set up the Danfoss Air HRV switch platform."""
+    from pydanfossair.commands import ReadCommand, UpdateCommand
+
+    data = hass.data[DANFOSS_AIR_DOMAIN]
+
+    switches = [
+        ["Danfoss Air Boost",
+         ReadCommand.boost,
+         UpdateCommand.boost_activate,
+         UpdateCommand.boost_deactivate],
+    ]
+
+    dev = []
+
+    for switch in switches:
+        dev.append(DanfossAir(
+            data, switch[0], switch[1], switch[2], switch[3]))
+
+    add_entities(dev)
+
+
+class DanfossAir(SwitchDevice):
+    """Representation of a Danfoss Air HRV Switch."""
+
+    def __init__(self, data, name, state_command, on_command, off_command):
+        """Initialize the switch."""
+        self._data = data
+        self._name = name
+        self._state_command = state_command
+        self._on_command = on_command
+        self._off_command = off_command
+        self._state = None
+
+    @property
+    def name(self):
+        """Return the name of the switch."""
+        return self._name
+
+    @property
+    def is_on(self):
+        """Return true if switch is on."""
+        return self._state
+
+    def turn_on(self, **kwargs):
+        """Turn the switch on."""
+        _LOGGER.debug("Turning on switch with command %s", self._on_command)
+        self._data.update_state(self._on_command, self._state_command)
+
+    def turn_off(self, **kwargs):
+        """Turn the switch off."""
+        _LOGGER.debug("Turning of switch with command %s", self._off_command)
+        self._data.update_state(self._off_command, self._state_command)
+
+    def update(self):
+        """Update the switch's state."""
+        self._data.update()
+
+        self._state = self._data.get_value(self._state_command)
+        if self._state is None:
+            _LOGGER.debug("Could not get data for %s", self._state_command)