diff --git a/custom_components/localthings/config_flow.py b/custom_components/localthings/config_flow.py
index 66cad38..c65fcec 100644
--- a/custom_components/localthings/config_flow.py
+++ b/custom_components/localthings/config_flow.py
@@ -225,6 +225,7 @@ def _probe_and_validate(host: str, ca_cert_pem: str, ca_key_pem: str) -> dict:
     from smartthings_local.protocol.dtls_session import DtlsCoapSession
     from .registry.batch import parse_device0_batch
     from .registry.by_type import resolve as resolve_registry
+    from .registry.identity import read_identity
 
     _LOGGER.debug("Fetching Samsung cloud UUID from %s", _SAMSUNG_CLOUD_HOST)
     try:
@@ -282,7 +283,15 @@ def _probe_and_validate(host: str, ca_cert_pem: str, ca_key_pem: str) -> dict:
             )
             if not serial or _is_placeholder_serial(serial):
                 serial = f"{host}:{port}"
-            recognized_registry = resolve_registry(resources)
+            # /oic/d's device type (read_identity) is the primary detection
+            # signal when a board populates it -- see registry/by_type's
+            # resolve(). read_identity is defensive on every GET it makes, so
+            # a device that doesn't answer /oic/p or /oic/d just yields an
+            # empty device_types tuple here, falling through to the model-
+            # string/resource-signature detection resolve() already did.
+            identity = read_identity(sess, None)
+            recognized_registry = resolve_registry(
+                resources, device_types=identity.device_types)
             return {
                 "port": port,
                 "serial": serial,
diff --git a/custom_components/localthings/coordinator.py b/custom_components/localthings/coordinator.py
index ab5a174..2e35948 100644
--- a/custom_components/localthings/coordinator.py
+++ b/custom_components/localthings/coordinator.py
@@ -634,6 +634,7 @@ class LocalThingsCoordinator(DataUpdateCoordinator[dict[str, Any]]):
         bound, device_type_name, materialized, skipped = discover_partitioned(
             resources, self.subdevices, resolve_registry, CAPABILITIES,
             log=unbound.append, tier_log=_tier_log,
+            oic_device_types=self._identity.device_types if self._identity else (),
         )
         self.subdevices = materialized
         self._skipped_subdevices = skipped
@@ -667,12 +668,16 @@ class LocalThingsCoordinator(DataUpdateCoordinator[dict[str, Any]]):
         if device_type_name is not None:
             self._log.debug("device type: %s (modelNum=%r)", device_type_name, model_num)
         else:
-            # Both fields: detection reads each of them (board token, then
-            # consumer-model code), and this line is what a user pastes into
-            # an issue -- modelNum alone doesn't identify a washer or dryer.
+            # All three: detection reads each of them (oic device type, then
+            # board token, then consumer-model code), and this line is what a
+            # user pastes into an issue -- modelNum alone doesn't identify a
+            # washer or dryer, and device_types is often empty even when
+            # populated hardware exists for a type we don't map yet.
             self._log.warning(
-                "unknown device type modelNum=%r description=%r; using common caps",
+                "unknown device type modelNum=%r description=%r device_types=%r; "
+                "using common caps",
                 model_num, description,
+                self._identity.device_types if self._identity else (),
             )
         self.device_type_name = device_type_name
         self.bound = bound
diff --git a/custom_components/localthings/registry/by_type/__init__.py b/custom_components/localthings/registry/by_type/__init__.py
index 69ea149..2374e4a 100644
--- a/custom_components/localthings/registry/by_type/__init__.py
+++ b/custom_components/localthings/registry/by_type/__init__.py
@@ -1,6 +1,6 @@
 """Per-device-type registries."""
 import re
-from typing import Optional
+from typing import Optional, Sequence
 
 from ._base import DeviceRegistry
 from . import (
@@ -10,7 +10,7 @@ from . import (
 )
 
 __all__ = [
-    'DeviceRegistry', 'resolve', 'for_device_by_model',
+    'DeviceRegistry', 'resolve', 'for_device_by_oic_type', 'for_device_by_model',
     'for_device_by_resources', '_board_tokens',
 ]
 
@@ -189,6 +189,43 @@ def _consumer_model_key(description: str) -> Optional[str]:
     return None
 
 
+# /oic/d's `rt` (OCF's own device-type declaration, see registry/identity.py)
+# -> registry key. This is the device naming its own type -- no board-part
+# guessing involved -- so it's consulted before modelNum/description at all.
+#
+# Kept as narrow as the board-token table: every entry here is backed by a
+# real dump/issue, not a guess at what the OCF or SmartThings spec might
+# define. `x.com.st.d.*` entries are SmartThings' own vendor extension to
+# the OCF device-type vocabulary (used for categories with no `oic.d.*`
+# equivalent), same prefix convention as the `x.com.samsung.da.*` resource
+# fields elsewhere in this codebase.
+_OIC_TYPE_TO_KEY: dict[str, str] = {
+    'oic.d.airconditioner': 'airconditioner',
+    'oic.d.dryer': 'dryer',
+    'oic.d.refrigerator': 'refrigerator',
+    'oic.d.washer': 'washer',
+    'x.com.st.d.stickcleaner': 'vacuum_station',  # issue #219 -- stick-vacuum clean station
+    'x.com.st.d.steamcloset': 'air_dresser',      # AirDresser / steam-closet garment care
+}
+
+
+def for_device_by_oic_type(device_types: Sequence[str]) -> Optional[DeviceRegistry]:
+    """Device-type detection from /oic/d's `rt` -- OCF's own device-type
+    declaration.
+
+    The primary path when a dump carries it: the device names its own type,
+    so there's nothing to infer from board part numbers. Most hardware still
+    doesn't populate `/oic/d` usefully -- see `resolve()`'s docstring -- so
+    this only ever helps a minority of dumps, and `for_device_by_model`/
+    `for_device_by_resources` remain load-bearing for everything else.
+    """
+    for device_type in device_types:
+        key = _OIC_TYPE_TO_KEY.get(device_type)
+        if key is not None:
+            return _REGISTRY_BY_KEY[key]
+    return None
+
+
 def for_device_by_model(model_num: str, description: str) -> Optional[DeviceRegistry]:
     """Device-type detection from /information/vs/0's model strings.
 
@@ -273,16 +310,22 @@ def for_device_by_resources(resources: dict[str, dict]) -> Optional[DeviceRegist
     return None
 
 
-def resolve(resources: dict[str, dict]) -> Optional[DeviceRegistry]:
+def resolve(
+    resources: dict[str, dict], device_types: Sequence[str] = (),
+) -> Optional[DeviceRegistry]:
     """Device type for a parsed /device/0 dump, or None if unrecognized.
 
     The single entry point for detection -- the coordinator, the config
     flow's probe and the golden-regression harness all call this, so the
     order can't drift between what ships and what the tests assert.
 
-    Model strings first (`for_device_by_model`), then a distinctive resource
-    signature (`for_device_by_resources`) for boards that report no
-    /information/vs/0 at all.
+    `device_types` (/oic/d's `rt`, read separately from the /device/0 dump --
+    see registry/identity.py) is the primary signal when present: the device
+    naming its own type beats parsing board part numbers. Falls back to model
+    strings (`for_device_by_model`), then a distinctive resource signature
+    (`for_device_by_resources`) for boards that report no /information/vs/0
+    at all -- both unchanged from before /oic/d was ever consulted, since most
+    hardware still doesn't populate it usefully.
 
     `/otninformation/vs/0`'s oneUiVersion is deliberately not consulted. It
     reads like the obvious signal -- the device naming its own type, e.g.
@@ -292,7 +335,11 @@ def resolve(resources: dict[str, dict]) -> Optional[DeviceRegistry]:
     is still reported in diagnostics as a firmware-generation marker.
     """
     info = resources.get('/information/vs/0', {})
-    return for_device_by_model(
-        info.get('x.com.samsung.da.modelNum', ''),
-        info.get('x.com.samsung.da.description', ''),
-    ) or for_device_by_resources(resources)
+    return (
+        for_device_by_oic_type(device_types)
+        or for_device_by_model(
+            info.get('x.com.samsung.da.modelNum', ''),
+            info.get('x.com.samsung.da.description', ''),
+        )
+        or for_device_by_resources(resources)
+    )
diff --git a/custom_components/localthings/registry/identity.py b/custom_components/localthings/registry/identity.py
index 9168456..32b0ba6 100644
--- a/custom_components/localthings/registry/identity.py
+++ b/custom_components/localthings/registry/identity.py
@@ -47,13 +47,13 @@ def _device_types(d: dict) -> tuple[str, ...]:
 
     In OCF this is the one standardized "what am I" field: alongside the
     generic 'oic.wk.d' it carries a concrete type such as 'oic.d.airconditioner'
-    or a Samsung 'x.com.samsung.da.*' equivalent. Nothing routes on it yet --
-    device-type detection currently parses board part numbers out of
-    /information/vs/0's modelNum instead (see registry/by_type/__init__.py) --
-    because no captured dump has ever included it: /device/0 batch responses
-    don't carry /oic/d, and diagnostics didn't report it. It's surfaced in
-    diagnostics so incoming issue reports can tell us whether real hardware
-    populates it usefully enough to route on.
+    or a SmartThings 'x.com.st.d.*' equivalent. `registry/by_type/resolve()`
+    now consults this first, ahead of board-part-number parsing, via
+    `for_device_by_oic_type` and its `_OIC_TYPE_TO_KEY` table -- but only a
+    minority of dumps populate it, so the modelNum/description path stays
+    load-bearing for everything else. It's also kept whole in diagnostics
+    (see `raw` below) so incoming issue reports keep surfacing types that
+    table doesn't know about yet.
     """
     rt = d.get('rt')
     if isinstance(rt, str):
diff --git a/custom_components/localthings/registry/subdevices.py b/custom_components/localthings/registry/subdevices.py
index c1d9b18..aed9bb4 100644
--- a/custom_components/localthings/registry/subdevices.py
+++ b/custom_components/localthings/registry/subdevices.py
@@ -80,7 +80,7 @@ from __future__ import annotations
 
 import re
 from dataclasses import dataclass
-from typing import Callable, Optional
+from typing import Callable, Optional, Sequence
 
 import cbor2
 
@@ -519,10 +519,11 @@ def _has_live_primary_entity(bound, state: dict) -> bool:
 def discover_partitioned(
     resources: dict[str, dict],
     subdevices: list['Subdevice'],
-    resolve_registry: Callable[[dict], object],
+    resolve_registry: Callable[..., object],
     fallback_capabilities: dict,
     log: Optional[Callable[[str], None]] = None,
     tier_log: Optional[Callable[[str, str], None]] = None,
+    oic_device_types: Sequence[str] = (),
 ):
     """Bind every href in `resources` (the merged, real-href snapshot -- main
     plus every enumerated subdevice's seed) to entities, partitioned by which
@@ -551,6 +552,15 @@ def discover_partitioned(
     first-discovery time only is a non-issue; getting a phantom subdevice
     silently counted into unbound_hrefs or hot/warm tiers is not.
 
+    `oic_device_types` (from the master's own `/oic/d`, see
+    registry/identity.py) is passed only to the *master's* resolution --
+    subdevices have no `/oic/d` of their own read today (they resolve from
+    their own `/information/vs/0` or fall back to the master's whole
+    registry, as documented above), and blindly applying the master's OCF
+    device type to every subdevice's own model-based resolution would be
+    wrong the moment a composite appliance ever pairs two genuinely
+    different device types under one connection.
+
     Returns `(bound, device_type_name, materialized, skipped)`:
     - `bound`: the concatenated BoundEntity list (main + every materialized
       subdevice).
@@ -575,7 +585,7 @@ def discover_partitioned(
     # owned_elsewhere here too.
     main_view = canonical_view(MAIN, resources, subdevices)
 
-    reg = resolve_registry(main_view)
+    reg = resolve_registry(main_view, device_types=oic_device_types)
     caps, pats = (
         (reg.capabilities, reg.pattern_capabilities) if reg is not None
         else (fallback_capabilities, [])
diff --git a/tests/test_by_type.py b/tests/test_by_type.py
index 96106e8..1060877 100644
--- a/tests/test_by_type.py
+++ b/tests/test_by_type.py
@@ -131,6 +131,53 @@ class TestConsumerModelKey:
         assert _consumer_model_key('ARTIK051_DONGLE_REF') is None
 
 
+class TestForDeviceByOicType:
+    """Primary device-type detection from /oic/d's `rt`."""
+
+    def test_every_oic_type_resolves_to_a_real_registry(self):
+        from custom_components.localthings.registry.by_type import (
+            _OIC_TYPE_TO_KEY, _REGISTRY_BY_KEY,
+        )
+        for oic_type, key in _OIC_TYPE_TO_KEY.items():
+            assert key in _REGISTRY_BY_KEY, f"{oic_type!r} -> unknown registry {key!r}"
+
+    @pytest.mark.parametrize('oic_type, expected', [
+        ('oic.d.airconditioner', 'airconditioner'),
+        ('oic.d.dryer', 'dryer'),
+        ('oic.d.refrigerator', 'refrigerator'),
+        ('oic.d.washer', 'washer'),
+        ('x.com.st.d.stickcleaner', 'vacuum_station'),
+        ('x.com.st.d.steamcloset', 'air_dresser'),
+    ])
+    def test_known_oic_types_resolve(self, oic_type, expected):
+        from custom_components.localthings.registry.by_type import for_device_by_oic_type
+        reg = for_device_by_oic_type((oic_type,))
+        assert reg is not None
+        assert reg.name == expected
+
+    def test_generic_wk_d_type_alone_resolves_nothing(self):
+        """The generic 'oic.wk.d' base type every OCF device carries
+        alongside its concrete type isn't itself a device type."""
+        from custom_components.localthings.registry.by_type import for_device_by_oic_type
+        assert for_device_by_oic_type(('oic.wk.d',)) is None
+
+    def test_unrecognized_type_returns_none(self):
+        from custom_components.localthings.registry.by_type import for_device_by_oic_type
+        assert for_device_by_oic_type(('oic.d.somethingnew',)) is None
+
+    def test_empty_returns_none(self):
+        from custom_components.localthings.registry.by_type import for_device_by_oic_type
+        assert for_device_by_oic_type(()) is None
+
+    def test_finds_the_concrete_type_alongside_the_generic_one(self):
+        """A real /oic/d `rt` carries both the generic base type and the
+        concrete one, order unspecified -- either position must resolve."""
+        from custom_components.localthings.registry.by_type import for_device_by_oic_type
+        reg = for_device_by_oic_type(('oic.wk.d', 'oic.d.washer'))
+        assert reg is not None
+        assert reg.name == 'washer'
+
+
 class TestForDeviceByModel:
     """Fallback device-type detection for hardware without oneUiVersion."""
 
@@ -580,6 +627,57 @@ class TestOneUiVersionIsNotConsulted:
 
 
 class TestResolve:
+    def test_oic_type_wins_over_model_strings(self):
+        """The device naming its own type via /oic/d beats board-token
+        parsing -- an unrecognizable modelNum with a known oic.d type must
+        still resolve, and a *conflicting* modelNum must lose to it."""
+        from custom_components.localthings.registry.by_type import resolve
+        resources = {
+            '/information/vs/0': {
+                'x.com.samsung.da.modelNum': 'SOME-UNKNOWN-BOARD',
+                'x.com.samsung.da.description': 'SOME-UNKNOWN-BOARD',
+            },
+        }
+        reg = resolve(resources, device_types=('oic.d.washer',))
+        assert reg is not None
+        assert reg.name == 'washer'
+
+        conflicting = resolve(
+            resources={
+                '/information/vs/0': {
+                    'x.com.samsung.da.modelNum': 'TP1X_REF_21K',
+                    'x.com.samsung.da.description': 'TP1X_REF_21K',
+                },
+            },
+            device_types=('oic.d.washer',),
+        )
+        assert conflicting is not None
+        assert conflicting.name == 'washer'
+
+    def test_empty_device_types_falls_back_to_model_strings(self):
+        from custom_components.localthings.registry.by_type import resolve
+        resources = {
+            '/information/vs/0': {
+                'x.com.samsung.da.modelNum': 'TP1X_REF_21K',
+                'x.com.samsung.da.description': 'TP1X_REF_21K',
+            },
+        }
+        reg = resolve(resources, device_types=())
+        assert reg is not None
+        assert reg.name == 'refrigerator'
+
+    def test_unmapped_device_types_falls_back_to_model_strings(self):
+        from custom_components.localthings.registry.by_type import resolve
+        resources = {
+            '/information/vs/0': {
+                'x.com.samsung.da.modelNum': 'TP1X_REF_21K',
+                'x.com.samsung.da.description': 'TP1X_REF_21K',
+            },
+        }
+        reg = resolve(resources, device_types=('oic.wk.d', 'oic.d.somethingnew'))
+        assert reg is not None
+        assert reg.name == 'refrigerator'
+
     def test_prefers_model_strings_over_resource_signature(self, all_device_fixtures):
         """Every fixture with usable model strings resolves the same way
         through `resolve` as through `for_device_by_model` directly."""
diff --git a/tests/test_subdevices.py b/tests/test_subdevices.py
index a386eaa..d501df6 100644
--- a/tests/test_subdevices.py
+++ b/tests/test_subdevices.py
@@ -476,7 +476,7 @@ def test_discover_partitioned_binds_main_and_subdevice_separately():
         '/mode/vs/1': {'m': 'sibling'},
     }
 
-    def resolve(_resources):
+    def resolve(_resources, **_kwargs):
         return reg
 
     bound, device_type_name, materialized, skipped = discover_partitioned(
@@ -516,7 +516,7 @@ def test_discover_partitioned_main_pass_excludes_subdevice_hrefs_from_unbound():
 
     unbound = []
     discover_partitioned(
-        resources, [sub1], lambda r: reg, fallback_capabilities={},
+        resources, [sub1], lambda r, **_: reg, fallback_capabilities={},
         log=unbound.append,
     )
     assert unbound == []
@@ -534,7 +534,7 @@ def test_discover_partitioned_subdevice_resolves_its_own_registry():
     sub1 = _indexed('1')
     resources = {'/mode/vs/0': {'x': 1}, '/mode/vs/1': {'x': 2}}
 
-    def resolve(view):
+    def resolve(view, **_kwargs):
         # The subdevice's canonical view is exactly {'/mode/vs/0': {'x': 2}}.
         return sub_reg if view.get('/mode/vs/0', {}).get('x') == 2 else main_reg
 
@@ -563,7 +563,7 @@ def test_discover_partitioned_subdevice_falls_back_to_master_registry():
         '/mode/vs/1': {'x': 2},
     }
 
-    def resolve(view):
+    def resolve(view, **_kwargs):
         return main_reg if view.get('/information/vs/0') else None
 
     bound, _, materialized, skipped = discover_partitioned(
@@ -575,6 +575,52 @@ def test_discover_partitioned_subdevice_falls_back_to_master_registry():
     assert '/mode/vs/1' in hrefs
 
 
+def test_discover_partitioned_oic_device_types_resolves_main_pass():
+    """`oic_device_types` reaches the main-pass resolve call as
+    `device_types=`, letting a fake `resolve_registry` mirror the real
+    resolve()'s precedence between /oic/d and model-based detection."""
+    cap = Capability(href='/mode/vs/0', entities=(BinarySensorDesc(key='m', field='x'),))
+    oic_reg = _FakeRegistry('washer', {'/mode/vs/0': [cap]})
+    resources = {'/mode/vs/0': {'x': 1}}
+
+    def resolve(_resources, device_types=()):
+        return oic_reg if 'oic.d.washer' in device_types else None
+
+    bound, device_type_name, _, _ = discover_partitioned(
+        resources, [], resolve, fallback_capabilities={},
+        oic_device_types=('oic.d.washer',),
+    )
+    assert device_type_name == 'washer'
+    assert {b.href for b in bound} == {'/mode/vs/0'}
+
+
+def test_discover_partitioned_oic_device_types_not_applied_to_subdevices():
+    """The master's own /oic/d type must not leak into a subdevice's own
+    resolution -- only main_view's resolve() call receives it, so a fake
+    resolver keyed purely on device_types resolves nothing for the
+    subdevice pass and it falls back to the master's registry, per the
+    documented (and unchanged) subdevice-fallback behavior."""
+    cap = Capability(href='/mode/vs/0', entities=(BinarySensorDesc(key='m', field='x'),))
+    oic_reg = _FakeRegistry('washer', {'/mode/vs/0': [cap]})
+    sub1 = _indexed('1')
+    resources = {'/mode/vs/0': {'x': 1}, '/mode/vs/1': {'x': 2}}
+
+    def resolve(_resources, device_types=()):
+        return oic_reg if 'oic.d.washer' in device_types else None
+
+    bound, device_type_name, materialized, skipped = discover_partitioned(
+        resources, [sub1], resolve, fallback_capabilities={},
+        oic_device_types=('oic.d.washer',),
+    )
+    assert device_type_name == 'washer'
+    assert materialized == [sub1]
+    assert skipped == []
+    # The subdevice's own resolve() call sees no device_types and returns
+    # None, falling back to the master's oic_reg -- same capabilities, so
+    # /mode/vs/1 still binds via that shared registry.
+    assert {b.href for b in bound} == {'/mode/vs/0', '/mode/vs/1'}
+
+
 def test_discover_partitioned_no_subdevices_matches_plain_discover():
     """For a device with no subdevices this must be exactly the single
     discover() call it replaces -- the hard regression guard the whole
@@ -586,7 +632,7 @@ def test_discover_partitioned_no_subdevices_matches_plain_discover():
     resources = {'/mode/vs/0': {'x': 1}}
 
     bound_via_helper, _, materialized, skipped = discover_partitioned(
-        resources, [], lambda r: reg, fallback_capabilities={},
+        resources, [], lambda r, **_: reg, fallback_capabilities={},
     )
     bound_direct = discover(resources, reg.capabilities, reg.pattern_capabilities)
 
@@ -619,7 +665,7 @@ def test_discover_partitioned_skips_candidate_with_no_live_primary_entity():
     }
 
     bound, _, materialized, skipped = discover_partitioned(
-        resources, [unit2], lambda r: reg, fallback_capabilities={},
+        resources, [unit2], lambda r, **_: reg, fallback_capabilities={},
     )
     assert materialized == []
     assert len(skipped) == 1
@@ -654,7 +700,7 @@ def test_discover_partitioned_materializes_candidate_with_live_primary_entity():
     }
 
     bound, _, materialized, skipped = discover_partitioned(
-        resources, [sub1], lambda r: reg, fallback_capabilities={},
+        resources, [sub1], lambda r, **_: reg, fallback_capabilities={},
     )
     assert materialized == [sub1]
     assert skipped == []
@@ -692,7 +738,7 @@ def test_discover_partitioned_skips_candidate_whose_only_live_primary_is_a_meter
     }
 
     bound, _, materialized, skipped = discover_partitioned(
-        resources, [unit1], lambda r: reg, fallback_capabilities={},
+        resources, [unit1], lambda r, **_: reg, fallback_capabilities={},
     )
     assert materialized == []
     assert [s.subdevice for s in skipped] == [unit1]
@@ -726,7 +772,7 @@ def test_discover_partitioned_meter_carve_out_does_not_gate_out_a_live_subdevice
     }
 
     bound, _, materialized, skipped = discover_partitioned(
-        resources, [unit1], lambda r: reg, fallback_capabilities={},
+        resources, [unit1], lambda r, **_: reg, fallback_capabilities={},
     )
     assert materialized == [unit1]
     assert skipped == []
@@ -748,7 +794,7 @@ def test_discover_partitioned_skipped_candidate_contributes_no_hot_warm_hrefs():
 
     tiers = []
     discover_partitioned(
-        resources, [unit2], lambda r: reg, fallback_capabilities={},
+        resources, [unit2], lambda r, **_: reg, fallback_capabilities={},
         tier_log=lambda href, tier: tiers.append(href),
     )
     assert '/mode/vs/2' not in tiers