Add events to BTHome (#91691)

Co-authored-by: J. Nick Koston <nick@koston.org>

homeassistant/components/bthome/const.py

@@ -1,3 +1,32 @@
 """Constants for the BTHome Bluetooth integration."""
+from __future__ import annotations
+
+from typing import Final, TypedDict
 
 DOMAIN = "bthome"
+
+CONF_BINDKEY: Final = "bindkey"
+CONF_DISCOVERED_EVENT_CLASSES: Final = "known_events"
+CONF_SUBTYPE: Final = "subtype"
+
+EVENT_TYPE: Final = "event_type"
+EVENT_CLASS: Final = "event_class"
+EVENT_PROPERTIES: Final = "event_properties"
+BTHOME_BLE_EVENT: Final = "bthome_ble_event"
+
+
+EVENT_CLASS_BUTTON: Final = "button"
+EVENT_CLASS_DIMMER: Final = "dimmer"
+
+CONF_EVENT_CLASS: Final = "event_class"
+CONF_EVENT_PROPERTIES: Final = "event_properties"
+
+
+class BTHomeBleEvent(TypedDict):
+    """BTHome BLE event data."""
+
+    device_id: str
+    address: str
+    event_class: str  # ie 'button'
+    event_type: str  # ie 'press'
+    event_properties: dict[str, str | int | float | None] | None