Add HomeWizard diagnostics (#65297)

Co-authored-by: Paulus Schoutsen <paulus@home-assistant.io>

.coveragerc

@@ -464,6 +464,7 @@ omit =
     homeassistant/components/homematic/*
     homeassistant/components/home_plus_control/api.py
     homeassistant/components/home_plus_control/switch.py
+    homeassistant/components/homewizard/diagnostics.py
     homeassistant/components/homeworks/*
     homeassistant/components/honeywell/__init__.py
     homeassistant/components/honeywell/climate.py

homeassistant/components/homewizard/diagnostics.py

@@ -0,0 +1,34 @@
+"""Diagnostics support for P1 Monitor."""
+from __future__ import annotations
+
+from typing import Any
+
+from homeassistant.components.diagnostics import async_redact_data
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import CONF_IP_ADDRESS
+from homeassistant.core import HomeAssistant
+
+from .const import DOMAIN
+from .coordinator import HWEnergyDeviceUpdateCoordinator
+
+TO_REDACT = {CONF_IP_ADDRESS, "serial", "wifi_ssid"}
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, entry: ConfigEntry
+) -> dict[str, Any]:
+    """Return diagnostics for a config entry."""
+    coordinator: HWEnergyDeviceUpdateCoordinator = hass.data[DOMAIN][entry.entry_id]
+
+    meter_data = {
+        "device": coordinator.api.device.todict(),
+        "data": coordinator.api.data.todict(),
+        "state": coordinator.api.state.todict()
+        if coordinator.api.state is not None
+        else None,
+    }
+
+    return {
+        "entry": async_redact_data(entry.data, TO_REDACT),
+        "data": async_redact_data(meter_data, TO_REDACT),
+    }