Add a debounce to ld2410 to prevent it from overwhelming the state machine with many devices (#93819)

* Add a debounce to ld2410 to prevent it from overwhelming the state machine

fixes #86665

* set time on debounce

homeassistant/components/ld2410_ble/__init__.py

@@ -2,7 +2,7 @@
 
 import logging
 
-from bleak_retry_connector import BleakError, get_device
+from bleak_retry_connector import BleakError, close_stale_connections, get_device
 from ld2410_ble import LD2410BLE
 
 from homeassistant.components import bluetooth
@@ -31,6 +31,9 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
         raise ConfigEntryNotReady(
             f"Could not find LD2410B device with address {address}"
         )
+
+    await close_stale_connections(ble_device)
+
     ld2410_ble = LD2410BLE(ble_device)
 
     coordinator = LD2410BLECoordinator(hass, ld2410_ble)

homeassistant/components/ld2410_ble/coordinator.py

@@ -1,16 +1,22 @@
 """Data coordinator for receiving LD2410B updates."""
 
+from datetime import datetime
 import logging
+import time
 
 from ld2410_ble import LD2410BLE, LD2410BLEState
 
-from homeassistant.core import HomeAssistant, callback
+from homeassistant.core import CALLBACK_TYPE, HassJob, HomeAssistant, callback
+from homeassistant.helpers.event import async_call_later
 from homeassistant.helpers.update_coordinator import DataUpdateCoordinator
 
 from .const import DOMAIN
 
 _LOGGER = logging.getLogger(__name__)
 
+NEVER_TIME = -86400.0
+DEBOUNCE_SECONDS = 1.0
+
 
 class LD2410BLECoordinator(DataUpdateCoordinator[None]):
     """Data coordinator for receiving LD2410B updates."""
@@ -26,15 +32,43 @@ class LD2410BLECoordinator(DataUpdateCoordinator[None]):
         ld2410_ble.register_callback(self._async_handle_update)
         ld2410_ble.register_disconnected_callback(self._async_handle_disconnect)
         self.connected = False
+        self._last_update_time = NEVER_TIME
+        self._debounce_cancel: CALLBACK_TYPE | None = None
+        self._debounced_update_job = HassJob(
+            self._async_handle_debounced_update,
+            f"LD2410 {ld2410_ble.address} BLE debounced update",
+        )
+
+    @callback
+    def _async_handle_debounced_update(self, _now: datetime) -> None:
+        """Handle debounced update."""
+        self._debounce_cancel = None
+        self._last_update_time = time.monotonic()
+        self.async_set_updated_data(None)
 
     @callback
     def _async_handle_update(self, state: LD2410BLEState) -> None:
         """Just trigger the callbacks."""
         self.connected = True
-        self.async_set_updated_data(None)
+        previous_last_updated_time = self._last_update_time
+        self._last_update_time = time.monotonic()
+        if self._last_update_time - previous_last_updated_time >= DEBOUNCE_SECONDS:
+            self.async_set_updated_data(None)
+            return
+        if self._debounce_cancel is None:
+            self._debounce_cancel = async_call_later(
+                self.hass, DEBOUNCE_SECONDS, self._debounced_update_job
+            )
 
     @callback
     def _async_handle_disconnect(self) -> None:
         """Trigger the callbacks for disconnected."""
         self.connected = False
         self.async_update_listeners()
+
+    async def async_shutdown(self) -> None:
+        """Shutdown the coordinator."""
+        if self._debounce_cancel is not None:
+            self._debounce_cancel()
+            self._debounce_cancel = None
+        await super().async_shutdown()