telegram_bot platform to only send messages (#8186)

* add new telegram_bot platform to only send messages

* Fix async

homeassistant/components/telegram_bot/__init__.py

@@ -227,7 +227,7 @@ def async_setup(hass, config):
     try:
         receiver_service = yield from \
             platform.async_setup_platform(hass, p_config)
-        if receiver_service is None:
+        if receiver_service is False:
             _LOGGER.error(
                 "Failed to initialize Telegram bot %s", p_type)
             return False

homeassistant/components/telegram_bot/broadcast.py

@@ -0,0 +1,28 @@
+"""
+Telegram bot implementation to send messages only.
+
+For more details about this platform, please refer to the documentation at
+https://home-assistant.io/components/telegram_bot.broadcast/
+"""
+import asyncio
+import logging
+
+from homeassistant.components.telegram_bot import (
+    PLATFORM_SCHEMA as TELEGRAM_PLATFORM_SCHEMA)
+from homeassistant.const import CONF_API_KEY
+
+_LOGGER = logging.getLogger(__name__)
+
+PLATFORM_SCHEMA = TELEGRAM_PLATFORM_SCHEMA
+
+
+@asyncio.coroutine
+def async_setup_platform(hass, config):
+    """Set up the Telegram broadcast platform."""
+    # Check the API key works
+    import telegram
+    bot = telegram.Bot(config[CONF_API_KEY])
+    bot_config = yield from hass.async_add_job(bot.getMe)
+    _LOGGER.debug("Telegram broadcast platform setup with bot %s",
+                  bot_config['username'])
+    return True