Add support for Vanderbilt SPC alarm panels and attached sensors (#7663)

* Add support for Vanderbilt SPC alarm panels.

 * Arm/disarm + read state

 * Autodiscover and add motion sensors

* Fix code formatting.

* Use asyncio.async for Python < 3.4.4.

* Fix for moved aiohttp exceptions.

* Add docstrings.

* Fix tests and add docstrings.

homeassistant/components/alarm_control_panel/spc.py

@@ -0,0 +1,96 @@
+"""
+Support for Vanderbilt (formerly Siemens) SPC alarm systems.
+
+For more details about this platform, please refer to the documentation at
+https://home-assistant.io/components/alarm_control_panel.spc/
+"""
+import asyncio
+import logging
+
+import homeassistant.components.alarm_control_panel as alarm
+from homeassistant.components.spc import (
+    SpcWebGateway, ATTR_DISCOVER_AREAS, DATA_API, DATA_REGISTRY)
+from homeassistant.const import (
+    STATE_ALARM_ARMED_AWAY, STATE_ALARM_ARMED_HOME, STATE_ALARM_DISARMED,
+    STATE_UNKNOWN)
+
+
+_LOGGER = logging.getLogger(__name__)
+
+SPC_AREA_MODE_TO_STATE = {'0': STATE_ALARM_DISARMED,
+                          '1': STATE_ALARM_ARMED_HOME,
+                          '3': STATE_ALARM_ARMED_AWAY}
+
+
+def _get_alarm_state(spc_mode):
+    return SPC_AREA_MODE_TO_STATE.get(spc_mode, STATE_UNKNOWN)
+
+
+@asyncio.coroutine
+def async_setup_platform(hass, config, async_add_entities,
+                         discovery_info=None):
+    """Set up the SPC alarm control panel platform."""
+    if (discovery_info is None or
+            discovery_info[ATTR_DISCOVER_AREAS] is None):
+        return
+
+    entities = [SpcAlarm(hass=hass,
+                         area_id=area['id'],
+                         name=area['name'],
+                         state=_get_alarm_state(area['mode']))
+                for area in discovery_info[ATTR_DISCOVER_AREAS]]
+
+    async_add_entities(entities)
+
+
+class SpcAlarm(alarm.AlarmControlPanel):
+    """Represents the SPC alarm panel."""
+
+    def __init__(self, hass, area_id, name, state):
+        """Initialize the SPC alarm panel."""
+        self._hass = hass
+        self._area_id = area_id
+        self._name = name
+        self._state = state
+        self._api = hass.data[DATA_API]
+
+        hass.data[DATA_REGISTRY].register_alarm_device(area_id, self)
+
+    @asyncio.coroutine
+    def async_update_from_spc(self, state):
+        """Update the alarm panel with a new state."""
+        self._state = state
+        yield from self.async_update_ha_state()
+
+    @property
+    def should_poll(self):
+        """No polling needed."""
+        return False
+
+    @property
+    def name(self):
+        """Return the name of the device."""
+        return self._name
+
+    @property
+    def state(self):
+        """Return the state of the device."""
+        return self._state
+
+    @asyncio.coroutine
+    def async_alarm_disarm(self, code=None):
+        """Send disarm command."""
+        yield from self._api.send_area_command(
+            self._area_id, SpcWebGateway.AREA_COMMAND_UNSET)
+
+    @asyncio.coroutine
+    def async_alarm_arm_home(self, code=None):
+        """Send arm home command."""
+        yield from self._api.send_area_command(
+            self._area_id, SpcWebGateway.AREA_COMMAND_PART_SET)
+
+    @asyncio.coroutine
+    def async_alarm_arm_away(self, code=None):
+        """Send arm away command."""
+        yield from self._api.send_area_command(
+            self._area_id, SpcWebGateway.AREA_COMMAND_SET)