[ci skip] home assistant integration

custom_components/victron_mk2_mqtt/entity.py

@@ -0,0 +1,29 @@
+"""Shared entity base for Victron MK2 MQTT."""
+
+from __future__ import annotations
+
+from homeassistant.helpers.entity import Entity
+
+from .coordinator import VictronMqttBridge
+
+
+class VictronMqttEntity(Entity):
+    """Base entity bound to shared MQTT bridge."""
+
+    _attr_should_poll = False
+    _attr_has_entity_name = True
+
+    def __init__(self, bridge: VictronMqttBridge) -> None:
+        self.bridge = bridge
+
+    @property
+    def device_info(self):
+        """Return the shared device info."""
+        return self.bridge.device_info
+
+    async def async_added_to_hass(self) -> None:
+        """Register for coordinator updates."""
+        self.async_on_remove(self.bridge.async_add_listener(self._handle_bridge_update))
+
+    def _handle_bridge_update(self) -> None:
+        self.async_write_ha_state()