Add ness alarm control panel using nessclient (#18463)

* Add ness alarm control panel using nessclient

* indenting

* .

* Remove availability functionality, will improve and add back in another PR

* Use call_count

* lint

* lint

* Review changes

* Lint

* Bump nessclient to 0.9.8

* Bump nessclient to 0.9.9

* Remove from .coveragerc

homeassistant/components/binary_sensor/ness_alarm.py

@@ -0,0 +1,81 @@
+"""
+Support for Ness D8X/D16X zone states - represented as binary sensors.
+
+For more details about this platform, please refer to the documentation at
+https://home-assistant.io/components/binary_sensor.ness_alarm/
+"""
+import logging
+
+from homeassistant.components.binary_sensor import BinarySensorDevice
+from homeassistant.components.ness_alarm import (
+    CONF_ZONES, CONF_ZONE_TYPE, CONF_ZONE_NAME, CONF_ZONE_ID,
+    SIGNAL_ZONE_CHANGED, ZoneChangedData)
+from homeassistant.core import callback
+from homeassistant.helpers.dispatcher import async_dispatcher_connect
+
+DEPENDENCIES = ['ness_alarm']
+_LOGGER = logging.getLogger(__name__)
+
+
+async def async_setup_platform(hass, config, async_add_entities,
+                               discovery_info=None):
+    """Set up the Ness Alarm binary sensor devices."""
+    if not discovery_info:
+        return
+
+    configured_zones = discovery_info[CONF_ZONES]
+
+    devices = []
+
+    for zone_config in configured_zones:
+        zone_type = zone_config[CONF_ZONE_TYPE]
+        zone_name = zone_config[CONF_ZONE_NAME]
+        zone_id = zone_config[CONF_ZONE_ID]
+        device = NessZoneBinarySensor(zone_id=zone_id, name=zone_name,
+                                      zone_type=zone_type)
+        devices.append(device)
+
+    async_add_entities(devices)
+
+
+class NessZoneBinarySensor(BinarySensorDevice):
+    """Representation of an Ness alarm zone as a binary sensor."""
+
+    def __init__(self, zone_id, name, zone_type):
+        """Initialize the binary_sensor."""
+        self._zone_id = zone_id
+        self._name = name
+        self._type = zone_type
+        self._state = 0
+
+    async def async_added_to_hass(self):
+        """Register callbacks."""
+        async_dispatcher_connect(
+            self.hass, SIGNAL_ZONE_CHANGED, self._handle_zone_change)
+
+    @property
+    def name(self):
+        """Return the name of the entity."""
+        return self._name
+
+    @property
+    def should_poll(self):
+        """No polling needed."""
+        return False
+
+    @property
+    def is_on(self):
+        """Return true if sensor is on."""
+        return self._state == 1
+
+    @property
+    def device_class(self):
+        """Return the class of this sensor, from DEVICE_CLASSES."""
+        return self._type
+
+    @callback
+    def _handle_zone_change(self, data: ZoneChangedData):
+        """Handle zone state update."""
+        if self._zone_id == data.zone_id:
+            self._state = data.state
+            self.async_schedule_update_ha_state()