Add diagnostic to V2C (#118823)

* add diagnostic platform

* add diagnostic platform

* add diagnostic platform

homeassistant/components/v2c/diagnostics.py

@@ -0,0 +1,35 @@
+"""Diagnostics support for V2C."""
+
+from __future__ import annotations
+
+from typing import TYPE_CHECKING, Any
+
+from homeassistant.components.diagnostics import async_redact_data
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import CONF_HOST
+from homeassistant.core import HomeAssistant
+
+from .const import DOMAIN
+from .coordinator import V2CUpdateCoordinator
+
+TO_REDACT = {CONF_HOST, "title"}
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, entry: ConfigEntry
+) -> dict[str, Any]:
+    """Return diagnostics for a config entry."""
+    coordinator: V2CUpdateCoordinator = hass.data[DOMAIN][entry.entry_id]
+
+    if TYPE_CHECKING:
+        assert coordinator.evse
+
+    coordinator_data = coordinator.evse.data
+    evse_raw_data = coordinator.evse.raw_data
+
+    return {
+        "config_entry": async_redact_data(entry.as_dict(), TO_REDACT),
+        "data": str(coordinator_data),
+        "raw_data": evse_raw_data["content"].decode("utf-8"),  # type: ignore[attr-defined]
+        "host_status": evse_raw_data["status_code"],
+    }