Envisalink support (#2304)

* Created a new platform for envisalink-based alarm panels (Honeywell/DSC)

* Added a sensor component and cleanup

* Completed initial development.

* Fixing pylint issues.

* Fix more pylint issues

* Fixed more validation issues.

* Final pylint issues

* Final tweaks prior to PR.

* Fixed final pylint issue

* Resolved a few minor issues, and used volumptous for validation.

* Fixing final lint issues

* Fixes to validation schema and refactoring.

homeassistant/components/sensor/envisalink.py

@@ -0,0 +1,68 @@
+"""
+Support for Envisalink sensors (shows panel info).
+
+For more details about this platform, please refer to the documentation at
+https://home-assistant.io/components/sensor.envisalink/
+"""
+import logging
+from homeassistant.components.envisalink import (EVL_CONTROLLER,
+                                                 PARTITION_SCHEMA,
+                                                 CONF_PARTITIONNAME,
+                                                 EnvisalinkDevice,
+                                                 SIGNAL_KEYPAD_UPDATE)
+
+DEPENDENCIES = ['envisalink']
+_LOGGER = logging.getLogger(__name__)
+
+
+def setup_platform(hass, config, add_devices_callback, discovery_info=None):
+    """Perform the setup for Envisalink sensor devices."""
+    _configured_partitions = discovery_info['partitions']
+    for part_num in _configured_partitions:
+        _device_config_data = PARTITION_SCHEMA(
+            _configured_partitions[part_num])
+        _device = EnvisalinkSensor(
+            _device_config_data[CONF_PARTITIONNAME],
+            part_num,
+            EVL_CONTROLLER.alarm_state['partition'][part_num],
+            EVL_CONTROLLER)
+        add_devices_callback([_device])
+
+
+class EnvisalinkSensor(EnvisalinkDevice):
+    """Representation of an envisalink keypad."""
+
+    def __init__(self, partition_name, partition_number, info, controller):
+        """Initialize the sensor."""
+        from pydispatch import dispatcher
+        self._icon = 'mdi:alarm'
+        self._partition_number = partition_number
+        _LOGGER.debug('Setting up sensor for partition: ' + partition_name)
+        EnvisalinkDevice.__init__(self,
+                                  partition_name + ' Keypad',
+                                  info,
+                                  controller)
+
+        dispatcher.connect(self._update_callback,
+                           signal=SIGNAL_KEYPAD_UPDATE,
+                           sender=dispatcher.Any)
+
+    @property
+    def icon(self):
+        """Return the icon if any."""
+        return self._icon
+
+    @property
+    def state(self):
+        """Return the overall state."""
+        return self._info['status']['alpha']
+
+    @property
+    def device_state_attributes(self):
+        """Return the state attributes."""
+        return self._info['status']
+
+    def _update_callback(self, partition):
+        """Update the partition state in HA, if needed."""
+        if partition is None or int(partition) == self._partition_number:
+            self.update_ha_state()