Add automatic keep-alive for IKEA Trådfri (#41778)

* Added automatic keep-alive for IKEA Trådfri

* Don't shut down factory on keep-alive error

* Avoid keep-alive after shutdown

Co-authored-by: Paulus Schoutsen <paulus@home-assistant.io>

Co-authored-by: Paulus Schoutsen <paulus@home-assistant.io>

homeassistant/components/tradfri/__init__.py

@@ -1,14 +1,19 @@
 """Support for IKEA Tradfri."""
 import asyncio
+from datetime import timedelta
+import logging
 
 from pytradfri import Gateway, RequestError
 from pytradfri.api.aiocoap_api import APIFactory
 import voluptuous as vol
 
 from homeassistant import config_entries
+from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import EVENT_HOMEASSISTANT_STOP
 from homeassistant.exceptions import ConfigEntryNotReady
 import homeassistant.helpers.config_validation as cv
+from homeassistant.helpers.event import async_track_time_interval
+from homeassistant.helpers.typing import ConfigType, HomeAssistantType
 from homeassistant.util.json import load_json
 
 from . import config_flow  # noqa: F401
@@ -31,6 +36,8 @@ from .const import (
     PLATFORMS,
 )
 
+_LOGGER = logging.getLogger(__name__)
+
 FACTORY = "tradfri_factory"
 LISTENERS = "tradfri_listeners"
 
@@ -49,7 +56,7 @@ CONFIG_SCHEMA = vol.Schema(
 )
 
 
-async def async_setup(hass, config):
+async def async_setup(hass: HomeAssistantType, config: ConfigType):
     """Set up the Tradfri component."""
     conf = config.get(DOMAIN)
 
@@ -94,7 +101,7 @@ async def async_setup(hass, config):
     return True
 
 
-async def async_setup_entry(hass, entry):
+async def async_setup_entry(hass: HomeAssistantType, entry: ConfigEntry):
     """Create a gateway."""
     # host, identity, key, allow_tradfri_groups
     tradfri_data = hass.data.setdefault(DOMAIN, {})[entry.entry_id] = {}
@@ -147,10 +154,23 @@ async def async_setup_entry(hass, entry):
             hass.config_entries.async_forward_entry_setup(entry, component)
         )
 
+    async def async_keep_alive(now):
+        if hass.is_stopping:
+            return
+
+        try:
+            await api(gateway.get_gateway_info())
+        except RequestError:
+            _LOGGER.error("Keep-alive failed")
+
+    listeners.append(
+        async_track_time_interval(hass, async_keep_alive, timedelta(seconds=60))
+    )
+
     return True
 
 
-async def async_unload_entry(hass, entry):
+async def async_unload_entry(hass: HomeAssistantType, entry: ConfigEntry):
     """Unload a config entry."""
     unload_ok = all(
         await asyncio.gather(