Add Reticulum/LXMF integration for Home Assistant

Custom integration connecting Home Assistant to a Reticulum network over a
TCPClientInterface and exchanging LXMF messages, with an Assist conversation
bridge, notify entity, sensors (incl. interface telemetry), buttons, services,
bus events and device triggers.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

custom_components/reticulum/entity.py

@@ -0,0 +1,39 @@
+"""Base entity for the Reticulum integration."""
+
+from __future__ import annotations
+
+from homeassistant.helpers.dispatcher import async_dispatcher_connect
+from homeassistant.helpers.entity import DeviceInfo, Entity
+
+from .const import DOMAIN, SIGNAL_STATE_UPDATED
+from .reticulum_client import ReticulumManager
+
+
+class ReticulumEntity(Entity):
+    """Base class wiring entities to the manager state updates."""
+
+    _attr_should_poll = False
+    _attr_has_entity_name = True
+
+    def __init__(self, manager: ReticulumManager, entry_id: str) -> None:
+        self._manager = manager
+        self._entry_id = entry_id
+        self._attr_device_info = DeviceInfo(
+            identifiers={(DOMAIN, entry_id)},
+            name="Reticulum",
+            manufacturer="Reticulum Network Stack",
+            model="LXMF Peer",
+            sw_version=manager.state.lxmf_address or None,
+            configuration_url="https://reticulum.network/",
+        )
+
+    async def async_added_to_hass(self) -> None:
+        """Subscribe to state-update signals."""
+        self.async_on_remove(
+            async_dispatcher_connect(
+                self.hass, SIGNAL_STATE_UPDATED, self._handle_update
+            )
+        )
+
+    def _handle_update(self) -> None:
+        self.async_write_ha_state()