Add support for WeMo LED lights.

.coveragerc

@@ -91,6 +91,7 @@ omit =
     homeassistant/components/light/hyperion.py
     homeassistant/components/light/lifx.py
     homeassistant/components/light/limitlessled.py
+    homeassistant/components/light/wemo.py
     homeassistant/components/media_player/cast.py
     homeassistant/components/media_player/denon.py
     homeassistant/components/media_player/firetv.py

homeassistant/components/light/wemo.py

@@ -0,0 +1,117 @@
+"""
+homeassistant.components.light.wemo
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Support for Belkin WeMo lights.
+
+For more details about this component, please refer to the documentation at
+https://home-assistant.io/components/light.wemo/
+"""
+import logging
+from datetime import timedelta
+
+import homeassistant.util as util
+from homeassistant.components.light import (
+    Light, ATTR_BRIGHTNESS)
+
+# REQUIREMENTS = ['pywemo==0.3.12']
+MIN_TIME_BETWEEN_SCANS = timedelta(seconds=10)
+MIN_TIME_BETWEEN_FORCED_SCANS = timedelta(milliseconds=100)
+
+_LOGGER = logging.getLogger(__name__)
+
+
+def setup_platform(hass, config, add_devices_callback, discovery_info=None):
+    """ Find WeMo bridges and return connected lights. """
+    import pywemo
+    import pywemo.discovery as discovery
+
+    if discovery_info is not None:
+        location = discovery_info[2]
+        mac = discovery_info[3]
+        device = discovery.device_from_description(location, mac)
+
+        if device and isinstance(device, pywemo.Bridge):
+            setup_bridge(device, add_devices_callback)
+        return
+
+    _LOGGER.info("Scanning for WeMo devices.")
+    devices = pywemo.discover_devices()
+
+    # Filter out the bridges
+    for device in devices:
+        if isinstance(device, pywemo.Bridge):
+            _LOGGER.info("Found bridge %s.", device)
+            setup_bridge(device, add_devices_callback)
+
+
+def setup_bridge(bridge, add_devices_callback):
+    """ Setup a WeMo link. """
+
+    lights = {}
+
+    @util.Throttle(MIN_TIME_BETWEEN_SCANS, MIN_TIME_BETWEEN_FORCED_SCANS)
+    def update_lights():
+        """ Updates the WeMo led objects with latest info from the bridge. """
+
+        bridge.bridge_get_lights()
+
+        new_lights = []
+
+        for light_id, info in bridge.Lights.items():
+            if light_id not in lights:
+                lights[light_id] = WemoLight(light_id, info,
+                                             bridge, update_lights)
+                new_lights.append(lights[light_id])
+            else:
+                lights[light_id].info = info
+
+        if new_lights:
+            add_devices_callback(new_lights)
+
+    update_lights()
+
+
+class WemoLight(Light):
+    """ Represents a WeMo light """
+
+    def __init__(self, light_id, info, bridge, update_lights):
+        self.light_id = light_id
+        self.info = info
+        self.bridge = bridge
+        self.update_lights = update_lights
+
+    @property
+    def unique_id(self):
+        """ Returns the id of this light """
+        deviceid = self.bridge.light_get_id(self.info)
+        return "{}.{}".format(self.__class__, deviceid)
+
+    @property
+    def name(self):
+        """ Get the name of the light. """
+        return self.bridge.light_name(self.info)
+
+    @property
+    def brightness(self):
+        """ Brightness of this light between 0..255. """
+        state = self.bridge.light_get_state(self.info)
+        return int(state['dim'])
+
+    @property
+    def is_on(self):
+        """ True if device is on. """
+        state = self.bridge.light_get_state(self.info)
+        return int(state['state'])
+
+    def turn_on(self, **kwargs):
+        """ Turn the light on. """
+        dim = kwargs.get(ATTR_BRIGHTNESS, self.brightness)
+        self.bridge.light_set_state(self.info, state=1, dim=dim)
+
+    def turn_off(self, **kwargs):
+        """ Turn the light off. """
+        self.bridge.light_set_state(self.info, state=0, dim=0)
+
+    def update(self):
+        """ Synchronize state with bridge. """
+        self.update_lights(no_throttle=True)