Fix callback and async (#31281)

* Fix callback and async

* Fix a return

* Fix test

* Fix mqtt tests

* Fix some more callbacks

homeassistant/components/homekit_controller/switch.py

@@ -4,6 +4,7 @@ import logging
 from homekit.model.characteristics import CharacteristicsTypes
 
 from homeassistant.components.switch import SwitchDevice
+from homeassistant.core import callback
 
 from . import KNOWN_DEVICES, HomeKitEntity
 
@@ -17,6 +18,7 @@ async def async_setup_entry(hass, config_entry, async_add_entities):
     hkid = config_entry.data["AccessoryPairingID"]
     conn = hass.data[KNOWN_DEVICES][hkid]
 
+    @callback
     def async_add_service(aid, service):
         if service["stype"] not in ("switch", "outlet"):
             return False