New component to connect to VELUX KLF 200 Interface (#8203)

* New component to connect to VELUX KLF 200 Interface

* Issue #8203: modifications as suggested by hound

* Issue #8203: added entries to .coveragerc

* moving velux/__init__p.y to velux.py

* Issue #8203: Using hass.data for storing global object, updated docstrings

* Issue #8203: validation of config, using standard approach for getting config values

* Issue #8203: Exception handling if connection to velux component fails

* Issue #8203: removed unused import

* Issue #8203: Some minor changes within docstrings

* Issue #8203: Some minor changes within docstrings

* Issue #8203: added dependency for pyvlx to requirements_all.txt

* Issue #8203: less broad exception

* Issue #8203: increased version

* Issue #8203: changed position of pyvlx within requirements_all.txt

* Issue #8203: bumped version of pyvlx to 0.1.3 (better handling of retries when token expires)

* reset pointer to home-assistant-polymer

* Issue #8203: modifications as suggested by fabaff

* hound *sigh*

homeassistant/components/velux.py

@@ -0,0 +1,69 @@
+"""
+Connects to VELUX KLF 200 interface.
+
+For more details about this platform, please refer to the documentation at
+https://home-assistant.io/components/scene.velux/
+
+"""
+
+import logging
+import asyncio
+
+import voluptuous as vol
+
+from homeassistant.helpers import discovery
+import homeassistant.helpers.config_validation as cv
+from homeassistant.const import (CONF_HOST, CONF_PASSWORD)
+
+DOMAIN = "velux"
+DATA_VELUX = "data_velux"
+SUPPORTED_DOMAINS = ['scene']
+_LOGGER = logging.getLogger(__name__)
+
+REQUIREMENTS = ['pyvlx==0.1.3']
+
+CONFIG_SCHEMA = vol.Schema({
+    DOMAIN: vol.Schema({
+        vol.Required(CONF_HOST): cv.string,
+        vol.Required(CONF_PASSWORD): cv.string,
+    })
+}, extra=vol.ALLOW_EXTRA)
+
+
+@asyncio.coroutine
+def async_setup(hass, config):
+    """Set up the velux component."""
+    from pyvlx import PyVLXException
+    try:
+        hass.data[DATA_VELUX] = VeluxModule(hass, config)
+        yield from hass.data[DATA_VELUX].async_start()
+
+    except PyVLXException as ex:
+        _LOGGER.exception("Can't connect to velux interface: %s", ex)
+        return False
+
+    for component in SUPPORTED_DOMAINS:
+        hass.async_add_job(
+            discovery.async_load_platform(hass, component, DOMAIN, {}, config))
+    return True
+
+
+class VeluxModule:
+    """Abstraction for velux component."""
+
+    def __init__(self, hass, config):
+        """Initialize for velux component."""
+        from pyvlx import PyVLX
+        self.initialized = False
+        host = config[DOMAIN].get(CONF_HOST)
+        password = config[DOMAIN].get(CONF_PASSWORD)
+        self.pyvlx = PyVLX(
+            host=host,
+            password=password)
+        self.hass = hass
+
+    @asyncio.coroutine
+    def async_start(self):
+        """Start velux component."""
+        yield from self.pyvlx.load_scenes()
+        self.initialized = True