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/diagnostics.py

@@ -0,0 +1,41 @@
+"""Diagnostics support for Reticulum."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from homeassistant.components.diagnostics import async_redact_data
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.core import HomeAssistant
+
+from .const import CONF_ALLOWED_IDENTITIES, CONF_DEFAULT_RECIPIENT, DOMAIN
+
+TO_REDACT = {CONF_DEFAULT_RECIPIENT, CONF_ALLOWED_IDENTITIES}
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, entry: ConfigEntry
+) -> dict[str, Any]:
+    """Return diagnostics for a config entry."""
+    runtime = hass.data[DOMAIN][entry.entry_id]
+    state = runtime.manager.state
+    return {
+        "entry": {
+            "data": dict(entry.data),
+            "options": async_redact_data(dict(entry.options), TO_REDACT),
+        },
+        "state": {
+            "started": state.started,
+            "interface_online": state.interface_online,
+            "lxmf_address": state.lxmf_address,
+            "display_name": state.display_name,
+            "messages_received": state.messages_received,
+            "messages_sent": state.messages_sent,
+            "messages_failed": state.messages_failed,
+            "peer_count": len(state.peers),
+            "peers": [
+                {"name": p.display_name, "hops": p.hops, "stamp_cost": p.stamp_cost}
+                for p in state.peers.values()
+            ],
+        },
+    }