Xiaomi MiIO Remote: Unique id added (#13266)

* Unique id added.

* Provide the exception as "ex"

homeassistant/components/remote/xiaomi_miio.py

@@ -18,6 +18,7 @@ from homeassistant.components.remote import (
 from homeassistant.const import (
     CONF_NAME, CONF_HOST, CONF_TOKEN, CONF_TIMEOUT,
     ATTR_ENTITY_ID, ATTR_HIDDEN, CONF_COMMAND)
+from homeassistant.exceptions import PlatformNotReady
 import homeassistant.helpers.config_validation as cv
 from homeassistant.util.dt import utcnow
 
@@ -78,10 +79,16 @@ def async_setup_platform(hass, config, async_add_devices, discovery_info=None):
 
     # Check that we can communicate with device.
     try:
-        device.info()
+        device_info = device.info()
+        model = device_info.model
+        unique_id = "{}-{}".format(model, device_info.mac_address)
+        _LOGGER.info("%s %s %s detected",
+                     model,
+                     device_info.firmware_version,
+                     device_info.hardware_version)
     except DeviceException as ex:
-        _LOGGER.error("Token not accepted by device : %s", ex)
-        return
+        _LOGGER.error("Device unavailable or token incorrect: %s", ex)
+        raise PlatformNotReady
 
     if DATA_KEY not in hass.data:
         hass.data[DATA_KEY] = {}
@@ -93,9 +100,9 @@ def async_setup_platform(hass, config, async_add_devices, discovery_info=None):
 
     hidden = config.get(ATTR_HIDDEN)
 
-    xiaomi_miio_remote = XiaomiMiioRemote(
-        friendly_name, device, slot, timeout,
-        hidden, config.get(CONF_COMMANDS))
+    xiaomi_miio_remote = XiaomiMiioRemote(friendly_name, device, unique_id,
+                                          slot, timeout, hidden,
+                                          config.get(CONF_COMMANDS))
 
     hass.data[DATA_KEY][host] = xiaomi_miio_remote
 
@@ -158,17 +165,23 @@ def async_setup_platform(hass, config, async_add_devices, discovery_info=None):
 class XiaomiMiioRemote(RemoteDevice):
     """Representation of a Xiaomi Miio Remote device."""
 
-    def __init__(self, friendly_name, device,
+    def __init__(self, friendly_name, device, unique_id,
                  slot, timeout, hidden, commands):
         """Initialize the remote."""
         self._name = friendly_name
         self._device = device
+        self._unique_id = unique_id
         self._is_hidden = hidden
         self._slot = slot
         self._timeout = timeout
         self._state = False
         self._commands = commands
 
+    @property
+    def unique_id(self):
+        """Return an unique ID."""
+        return self._unique_id
+
     @property
     def name(self):
         """Return the name of the remote."""