Add Lannouncer tts notify component (#5187)

* Add Lannouncer notify component

* Send message by opening a raw TCP socket instead of using requests. Cleanup of method validation.

* Use 'return' instead of 'return None'

homeassistant/components/notify/lannouncer.py

@@ -0,0 +1,85 @@
+"""
+Lannouncer platform for notify component.
+
+For more details about this platform, please refer to the documentation at
+https://home-assistant.io/components/notify.lannouncer/
+"""
+import logging
+
+from urllib.parse import urlencode
+import socket
+import voluptuous as vol
+
+from homeassistant.components.notify import (
+    PLATFORM_SCHEMA, ATTR_DATA, BaseNotificationService)
+from homeassistant.const import (CONF_HOST, CONF_PORT)
+import homeassistant.helpers.config_validation as cv
+
+ATTR_METHOD = 'method'
+ATTR_METHOD_DEFAULT = 'speak'
+ATTR_METHOD_ALLOWED = ['speak', 'alarm']
+
+DEFAULT_PORT = 1035
+
+PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
+    vol.Required(CONF_HOST): cv.string,
+    vol.Optional(CONF_PORT, default=DEFAULT_PORT): cv.port,
+})
+
+_LOGGER = logging.getLogger(__name__)
+
+
+def get_service(hass, config):
+    """Get the Lannouncer notification service."""
+    host = config.get(CONF_HOST)
+    port = config.get(CONF_PORT)
+
+    return LannouncerNotificationService(hass, host, port)
+
+
+class LannouncerNotificationService(BaseNotificationService):
+    """Implementation of a notification service for Lannouncer."""
+
+    def __init__(self, hass, host, port):
+        """Initialize the service."""
+        self._hass = hass
+        self._host = host
+        self._port = port
+
+    def send_message(self, message="", **kwargs):
+        """Send a message to Lannouncer."""
+        data = kwargs.get(ATTR_DATA)
+        if data is not None and ATTR_METHOD in data:
+            method = data.get(ATTR_METHOD)
+        else:
+            method = ATTR_METHOD_DEFAULT
+
+        if method not in ATTR_METHOD_ALLOWED:
+            _LOGGER.error("Unknown method %s", method)
+            return
+
+        cmd = urlencode({method: message})
+
+        try:
+            # Open socket
+            sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+            sock.settimeout(10)
+            sock.connect((self._host, self._port))
+
+            # Send message
+            _LOGGER.debug("Sending message: %s", cmd)
+            sock.sendall(cmd.encode())
+            sock.sendall("&@DONE@\n".encode())
+
+            # Check response
+            buffer = sock.recv(1024)
+            if buffer != b'LANnouncer: OK':
+                _LOGGER.error('Error sending data to Lannnouncer: %s',
+                              buffer.decode())
+
+            # Close socket
+            sock.close()
+        except socket.gaierror:
+            _LOGGER.error('Unable to connect to host %s', self._host)
+        except socket.error:
+            _LOGGER.exception('Failed to send data to Lannnouncer')