Split out dovado to a component and sensor platform (#20339)

* Split out dovado to a component and sensor platform

* Lint

* Address code review comments (#20339)

* Switch to using a notify platform for dovado SMS (#20339)

* Optimizing imports

* Remove return on `setup_platform`.

* Clean up unneeded constants

homeassistant/components/dovado/notify.py

@@ -0,0 +1,38 @@
+"""
+Support for SMS notifications from the Dovado router.
+
+For more details about this platform, please refer to the documentation at
+https://home-assistant.io/components/notify.dovado/
+"""
+import logging
+
+from homeassistant.components.dovado import DOMAIN as DOVADO_DOMAIN
+from homeassistant.components.notify import BaseNotificationService, \
+    ATTR_TARGET
+
+_LOGGER = logging.getLogger(__name__)
+
+DEPENDENCIES = ['dovado']
+
+
+def get_service(hass, config, discovery_info=None):
+    """Get the Dovado Router SMS notification service."""
+    return DovadoSMSNotificationService(hass.data[DOVADO_DOMAIN].client)
+
+
+class DovadoSMSNotificationService(BaseNotificationService):
+    """Implement the notification service for the Dovado SMS component."""
+
+    def __init__(self, client):
+        """Initialize the service."""
+        self._client = client
+
+    def send_message(self, message, **kwargs):
+        """Send SMS to the specified target phone number."""
+        target = kwargs.get(ATTR_TARGET)
+
+        if not target:
+            _LOGGER.error("One target is required")
+            return
+
+        self._client.send_sms(target, message)