fix(availability): F3 — any usable transport keeps the entities up (t40)

Reported from a live install: with ADB enabled but unreachable and a paired,
healthy protocol transport, the media player went unavailable even though the
protocol still served power/app/volume.

The old rule was ``manager.connected or manager.awake is not None or not
manager.available`` — i.e. "a configured ADB manager that is down ⇒ the whole
entity is down" (t5-F2), which ignored transport B entirely. The ladder is now:

* protocol transport wired and not reported unreachable — usable;
* or ADB connected — usable;
* or fresh wake data (the poller has spoken) — usable;
* or a passive manager (no ADB configured at all) — usable, because nothing to
  transport is not a broken transport.

Unavailable only when a CONFIGURED transport is actively down and no usable data
exists. One implementation, ``entity_available`` (media_player.py), is used by the
media player, the remote (whose ladder previously duplicated a weaker version of
this rule) and the diagnostics payload.

Diagnostics grew ``transport.entity_available`` plus ``adb.configured`` so a
support dump answers "why is my entity unavailable?" — the ladder inputs and its
verdict are now in the same place.

Pinned by tests: the exact user case (ADB configured+down, protocol up ⇒
available), all-down (⇒ unavailable), wake-data rescue, connected ADB without a
protocol, the passive manager, a configured-but-down transport with no data, the
remote following the same ladder, and the diagnostics verdict.

Verified: 310 passed / 2 skipped, 311 passed / 1 skipped (androidtvremote2),
16 passed in the HA drift suite, ruff clean.

custom_components/nvidia_shield/diagnostics.py

@@ -19,6 +19,7 @@ from homeassistant.core import HomeAssistant
 from homeassistant.helpers.redact import async_redact_data
 
 from .connection import ShieldConnectionManager
+from .media_player import entity_available
 
 _REDACT_KEY_MARKERS = ("pairing", "pin", "secret", "password", "token", "key_material")
 _REDACTED = "**REDACTED**"
@@ -81,7 +82,14 @@ async def async_get_config_entry_diagnostics(
     if isinstance(manager, ShieldConnectionManager):
         payload["store"] = manager.store_snapshot()
         payload["transport"] = {
-            "adb": {"connected": manager.connected, "awake": manager.awake},
+            # t40: the ladder's verdict, from the same helper the entities use,
+            # so a support dump answers "why is my entity unavailable?".
+            "entity_available": entity_available(manager),
+            "adb": {
+                "configured": manager.available,
+                "connected": manager.connected,
+                "awake": manager.awake,
+            },
             "protocol": {
                 "active": manager.protocol_active,
                 "available": manager.is_available,

custom_components/nvidia_shield/media_player.py

@@ -153,6 +153,35 @@ async def _migrate_legacy_unique_id(hass, entry) -> None:
     _LOGGER.info("P5-1: legacy unique_id %r migrated to %r", legacy, new_id)
 
 
+def entity_available(manager: ShieldConnectionManager | None) -> bool:
+    """Is ANY usable transport healthy for this entry? (t40 live install)
+
+    The single ladder behind ``media_player.available``, ``remote.available``
+    and the diagnostics payload, so the three cannot disagree:
+
+    * the protocol transport is wired and has not reported the device
+      unreachable — it serves power/app/volume even when ADB is down;
+    * or ADB is connected (live state data);
+    * or fresh wake data exists (the poller has spoken at least once);
+    * or the manager is passive (no ADB configured at all): nothing to
+      transport is not a broken transport.
+
+    Unavailable only when a CONFIGURED transport is actively down and no usable
+    data exists. The t5-F2 rule ("an ADB manager that is down means unreliable
+    state") took the whole entity down while a healthy paired protocol transport
+    was still serving commands — the reported defect.
+    """
+    if not isinstance(manager, ShieldConnectionManager):
+        return True
+    if manager.protocol_active and manager.is_available is not False:
+        return True
+    if manager.connected:
+        return True
+    if manager.awake is not None:
+        return True
+    return not manager.available
+
+
 def resolve_app_name(
     package: str | None,
     app_name_map,
@@ -225,15 +254,13 @@ class NvidiaShieldMediaPlayer(MediaPlayerEntity):
 
     @property
     def available(self) -> bool:
-        """The bridge entities stay functional without ADB (passive manager).
+        """Available while ANY usable transport is healthy (t40 live install).
 
-        Unavailable only while an active ADB manager is down — its data is
-        unreliable until the watchdog reconnects (t5-F2).
+        ADB enabled but unreachable no longer takes the entity down: a paired,
+        available protocol transport still serves power/app/volume. The ladder
+        is shared with the remote and diagnostics (``entity_available``).
         """
-        manager = getattr(self._entry, "runtime_data", None)
-        if not isinstance(manager, ShieldConnectionManager):
-            return True
-        return manager.connected or manager.awake is not None or not manager.available
+        return entity_available(getattr(self._entry, "runtime_data", None))
 
     @property
     def _jellyfin_entity(self) -> str | None:

custom_components/nvidia_shield/remote.py

@@ -25,6 +25,7 @@ from homeassistant.helpers.entity_platform import AddEntitiesCallback
 
 from .connection import ShieldConnectionManager
 from .const import DOMAIN, PROTOCOL_REMOTE_KEYS
+from .media_player import entity_available
 
 _START_PREFIX = "START_LONG:"
 _END_PREFIX = "END_LONG:"
@@ -93,17 +94,14 @@ class NvidiaShieldRemoteEntity(RemoteEntity):
 
     @property
     def available(self) -> bool:
-        """Unavailable while the transport is active but unpaired/down.
+        """Available while ANY usable transport can serve a command (t40).
 
-        A passive manager (no protocol transport) keeps the entity available:
-        nothing to transport is not a broken one.
+        The same ladder as the media player (``entity_available``): protocol
+        wired+available, ADB connected, fresh wake data or a passive manager all
+        count as usable, and a passive manager stays available — nothing to
+        transport is not a broken one.
         """
-        manager = self._manager_of()
-        if not isinstance(manager, ShieldConnectionManager):
-            return True
-        if not manager.protocol_active:
-            return True
-        return manager.is_available is not False
+        return entity_available(self._manager_of())
 
     @property
     def activity(self) -> str | None:

tests/test_command_routing.py

@@ -1174,6 +1174,19 @@ class TestBrowseMediaDirectory:
         assert protocol.launch_calls == [selected.media_content_id]  # C-LAUNCH
 
 
+class DownAdbPoller(FakeAdbPoller):
+    """A CONFIGURED ADB poller that cannot reach the device (t40 repro)."""
+
+    connected = False
+
+
+def make_manager_with(*, poller=None, protocol=None):
+    """A manager with exactly these transports (None = not configured)."""
+    return ShieldConnectionManager(
+        hass=None, entry=None, poller=poller, protocol=protocol, store=None
+    )
+
+
 def make_app_sensor(modules, manager, entry, *, atv_state=None):
     """A Current App sensor over the given manager/entry (t40)."""
     from types import SimpleNamespace
@@ -1264,3 +1277,84 @@ class TestCurrentAppSensorFriendlyName:
         player._manager._on_current_app("ar.tvplayer.tv")
 
         assert sensor.native_value == player.app_name == "TiviMate"
+
+
+class TestAvailabilityLadder:
+    """t40: ADB enabled-but-unreachable + a healthy protocol = AVAILABLE.
+
+    The t5-F2 rule took the whole entity down whenever a configured ADB manager
+    was disconnected, even though the paired protocol transport was still
+    serving power/app/volume.
+    """
+
+    def _player(self, modules, *, poller=None, protocol=None):
+        player, _served, _intents = make_player(
+            modules, manager=make_manager_with(poller=poller, protocol=protocol)
+        )
+        player._entry.runtime_data = player._manager
+        return player
+
+    def test_the_users_case_keeps_the_entity_available(self, modules):
+        player = self._player(modules, poller=DownAdbPoller(), protocol=FakeProtocolClient())
+        player._manager._on_is_available(True)
+
+        assert player._manager.available is True  # ADB is configured ...
+        assert player._manager.connected is False  # ... but unreachable
+        assert player.available is True  # the protocol carries the entity
+
+    def test_unavailable_when_every_configured_transport_is_down(self, modules):
+        player = self._player(modules, poller=DownAdbPoller(), protocol=FakeProtocolClient())
+        player._manager._on_is_available(False)
+
+        assert player.available is False
+
+    def test_fresh_wake_data_is_enough(self, modules):
+        player = self._player(modules, poller=DownAdbPoller(), protocol=FakeProtocolClient())
+        player._manager._on_is_available(False)
+        player._manager.store.set("awake", False)
+
+        assert player.available is True
+
+    def test_a_connected_adb_carries_a_protocol_less_entry(self, modules):
+        player = self._player(modules, poller=FakeAdbPoller(), protocol=None)
+
+        assert player._manager.protocol_active is False
+        assert player.available is True
+
+    def test_a_passive_manager_stays_available(self, modules):
+        player = self._player(modules, poller=None, protocol=None)
+
+        assert player._manager.available is False  # no ADB configured at all
+        assert player.available is True
+
+    def test_a_configured_but_down_transport_is_unavailable(self, modules):
+        player = self._player(modules, poller=DownAdbPoller(), protocol=None)
+
+        assert player.available is False
+
+    def test_the_remote_follows_the_same_ladder(self, modules):
+        from types import SimpleNamespace
+
+        player = self._player(modules, poller=DownAdbPoller(), protocol=FakeProtocolClient())
+        player._manager._on_is_available(True)
+        remote = modules["remote"].NvidiaShieldRemoteEntity(
+            SimpleNamespace(), player._entry
+        )
+
+        assert remote.available is True
+
+    def test_the_diagnostics_dump_explains_the_ladder(self, modules):
+        player = self._player(modules, poller=DownAdbPoller(), protocol=FakeProtocolClient())
+        player._manager._on_is_available(True)
+
+        from nsh.diagnostics import async_get_config_entry_diagnostics
+
+        entry = player._entry
+        entry.data = {}
+        entry.options = {}
+        payload = asyncio.run(async_get_config_entry_diagnostics(None, entry))
+
+        transport = payload["transport"]
+        assert transport["entity_available"] is True
+        assert transport["adb"] == {"configured": True, "connected": False, "awake": None}
+        assert transport["protocol"]["active"] is True