Add OUI to tplink diagnostics (#97646)

* Add OUI to tplink diagnostics

The main reason discovery does not work for new devices is we
are missing the OUI. Since we redact the whole mac address in
the diagnostics, this makes it difficult to fix. We now include
the OUI in the diagnostics

* fix: use cached mac

* fix: tests

homeassistant/components/tplink/diagnostics.py

@@ -6,6 +6,7 @@ from typing import Any
 from homeassistant.components.diagnostics import async_redact_data
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.core import HomeAssistant
+from homeassistant.helpers.device_registry import format_mac
 
 from .const import DOMAIN
 from .coordinator import TPLinkDataUpdateCoordinator
@@ -36,6 +37,8 @@ async def async_get_config_entry_diagnostics(
 ) -> dict[str, Any]:
     """Return diagnostics for a config entry."""
     coordinator: TPLinkDataUpdateCoordinator = hass.data[DOMAIN][entry.entry_id]
+    oui = format_mac(coordinator.device.mac)[:8].upper()
     return async_redact_data(
-        {"device_last_response": coordinator.device.internal_state}, TO_REDACT
+        {"device_last_response": coordinator.device.internal_state, "oui": oui},
+        TO_REDACT,
     )

tests/components/tplink/test_diagnostics.py

@@ -14,17 +14,19 @@ from tests.typing import ClientSessionGenerator
 
 
 @pytest.mark.parametrize(
-    ("mocked_dev", "fixture_file", "sysinfo_vars"),
+    ("mocked_dev", "fixture_file", "sysinfo_vars", "expected_oui"),
     [
         (
             _mocked_bulb(),
             "tplink-diagnostics-data-bulb-kl130.json",
             ["mic_mac", "deviceId", "oemId", "hwId", "alias"],
+            "AA:BB:CC",
         ),
         (
             _mocked_plug(),
             "tplink-diagnostics-data-plug-hs110.json",
             ["mac", "deviceId", "oemId", "hwId", "alias", "longitude_i", "latitude_i"],
+            "AA:BB:CC",
         ),
     ],
 )
@@ -34,6 +36,7 @@ async def test_diagnostics(
     mocked_dev: SmartDevice,
     fixture_file: str,
     sysinfo_vars: list[str],
+    expected_oui: str | None,
 ):
     """Test diagnostics for config entry."""
     diagnostics_data = json.loads(load_fixture(fixture_file, "tplink"))
@@ -58,3 +61,5 @@ async def test_diagnostics(
     sysinfo = last_response["system"]["get_sysinfo"]
     for var in sysinfo_vars:
         assert sysinfo[var] == "**REDACTED**"
+
+    assert result["oui"] == expected_oui