Fix ness_alarm tasks being fired before required sensors and panel are loaded asynchronously (#94590)

Co-authored-by: Erik Montnemery <erik@montnemery.com>

homeassistant/components/ness_alarm/__init__.py

@@ -1,6 +1,7 @@
 """Support for Ness D8X/D16X devices."""
 from collections import namedtuple
 import datetime
+import logging
 
 from nessclient import ArmingState, Client
 import voluptuous as vol
@@ -21,8 +22,11 @@ from homeassistant.core import HomeAssistant, ServiceCall
 from homeassistant.helpers import config_validation as cv
 from homeassistant.helpers.discovery import async_load_platform
 from homeassistant.helpers.dispatcher import async_dispatcher_send
+from homeassistant.helpers.start import async_at_started
 from homeassistant.helpers.typing import ConfigType
 
+_LOGGER = logging.getLogger(__name__)
+
 DOMAIN = "ness_alarm"
 DATA_NESS = "ness_alarm"
 
@@ -109,6 +113,14 @@ async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
 
     hass.bus.async_listen_once(EVENT_HOMEASSISTANT_STOP, _close)
 
+    async def _started(event):
+        # Force update for current arming status and current zone states (once Home Assistant has finished loading required sensors and panel)
+        _LOGGER.debug("invoking client keepalive() & update()")
+        hass.loop.create_task(client.keepalive())
+        hass.loop.create_task(client.update())
+
+    async_at_started(hass, _started)
+
     hass.async_create_task(
         async_load_platform(
             hass, Platform.BINARY_SENSOR, DOMAIN, {CONF_ZONES: zones}, config
@@ -131,10 +143,6 @@ async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
     client.on_zone_change(on_zone_change)
     client.on_state_change(on_state_change)
 
-    # Force update for current arming status and current zone states
-    hass.loop.create_task(client.keepalive())
-    hass.loop.create_task(client.update())
-
     async def handle_panic(call: ServiceCall) -> None:
         await client.panic(call.data[ATTR_CODE])