Discover tplink devices periodically (#57221)

- These devices sometimes do not respond on the first try
  or may be subject to transient broadcast failures, or
  overloads. We now try discovery periodically once the
  integration has been loaded.

- We used to try this 4x at startup, but that solution
  seemed to aggressive as we want to be sure we pickup
  the devices after startup as well since the network
  will likely be more calm after startup.

homeassistant/components/tplink/__init__.py

@@ -2,6 +2,7 @@
 from __future__ import annotations
 
 import asyncio
+from datetime import timedelta
 from typing import Any
 
 from kasa import SmartDevice, SmartDeviceException
@@ -11,9 +12,15 @@ import voluptuous as vol
 from homeassistant import config_entries
 from homeassistant.components import network
 from homeassistant.config_entries import ConfigEntry, ConfigEntryNotReady
-from homeassistant.const import CONF_HOST, CONF_MAC, CONF_NAME
+from homeassistant.const import (
+    CONF_HOST,
+    CONF_MAC,
+    CONF_NAME,
+    EVENT_HOMEASSISTANT_STARTED,
+)
 from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers import config_validation as cv, device_registry as dr
+from homeassistant.helpers.event import async_track_time_interval
 from homeassistant.helpers.typing import ConfigType
 
 from .const import (
@@ -32,6 +39,8 @@ from .migration import (
     async_migrate_yaml_entries,
 )
 
+DISCOVERY_INTERVAL = timedelta(minutes=15)
+
 TPLINK_HOST_SCHEMA = vol.Schema({vol.Required(CONF_HOST): cv.string})
 
 CONFIG_SCHEMA = vol.Schema(
@@ -118,6 +127,13 @@ async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
     if discovered_devices:
         async_trigger_discovery(hass, discovered_devices)
 
+    async def _async_discovery(*_: Any) -> None:
+        if discovered := await async_discover_devices(hass):
+            async_trigger_discovery(hass, discovered)
+
+    hass.bus.async_listen_once(EVENT_HOMEASSISTANT_STARTED, _async_discovery)
+    async_track_time_interval(hass, _async_discovery, DISCOVERY_INTERVAL)
+
     return True
 
 

tests/components/tplink/test_init.py

@@ -1,27 +1,41 @@
 """Tests for the TP-Link component."""
 from __future__ import annotations
 
-from unittest.mock import patch
+from datetime import timedelta
+from unittest.mock import MagicMock, patch
 
 from homeassistant.components import tplink
 from homeassistant.components.tplink.const import DOMAIN
 from homeassistant.config_entries import ConfigEntryState
-from homeassistant.const import CONF_HOST
+from homeassistant.const import CONF_HOST, EVENT_HOMEASSISTANT_STARTED
 from homeassistant.setup import async_setup_component
+from homeassistant.util import dt as dt_util
 
 from . import IP_ADDRESS, MAC_ADDRESS, _patch_discovery, _patch_single_discovery
 
-from tests.common import MockConfigEntry
+from tests.common import MockConfigEntry, async_fire_time_changed
 
 
 async def test_configuring_tplink_causes_discovery(hass):
     """Test that specifying empty config does discovery."""
     with patch("homeassistant.components.tplink.Discover.discover") as discover:
-        discover.return_value = {"host": 1234}
+        discover.return_value = {MagicMock(): MagicMock()}
         await async_setup_component(hass, tplink.DOMAIN, {tplink.DOMAIN: {}})
         await hass.async_block_till_done()
+        call_count = len(discover.mock_calls)
+        assert discover.mock_calls
 
-    assert discover.mock_calls
+        hass.bus.async_fire(EVENT_HOMEASSISTANT_STARTED)
+        await hass.async_block_till_done()
+        assert len(discover.mock_calls) == call_count * 2
+
+        async_fire_time_changed(hass, dt_util.utcnow() + timedelta(minutes=15))
+        await hass.async_block_till_done()
+        assert len(discover.mock_calls) == call_count * 3
+
+        async_fire_time_changed(hass, dt_util.utcnow() + timedelta(minutes=30))
+        await hass.async_block_till_done()
+        assert len(discover.mock_calls) == call_count * 4
 
 
 async def test_config_entry_reload(hass):