diff --git a/haco/capabilities.py b/haco/capabilities.py
index df3daa4..73eb7f6 100644
--- a/haco/capabilities.py
+++ b/haco/capabilities.py
@@ -1,11 +1,12 @@
 from __future__ import annotations
 
 from dataclasses import dataclass, field
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, Type
 
 from fmtr.tools.iterator_tools import strip_none
 from haco.base import Base
 from haco.topics import AnnounceTopicState, AnnounceTopicCommand
+from haco.utils import Converters
 
 if TYPE_CHECKING:
     from haco.control import Control
@@ -15,6 +16,8 @@ if TYPE_CHECKING:
 class Capability(Base):
     name: str | None = None
 
+    converters: Type[Converters] | None = field(default=None, metadata=dict(exclude=True))
+
     state: AnnounceTopicState | None = field(default_factory=AnnounceTopicState)
     command: AnnounceTopicCommand | None = field(default_factory=AnnounceTopicCommand)
     subscriptions: dict | None = field(default=None, metadata=dict(exclude=True), init=False)
@@ -27,6 +30,7 @@ class Capability(Base):
         for topic in self.topics:
             topic.set_parent(self)
 
+        self.converters = self.converters or self.control.converters
         self.subscriptions = self.get_subscriptions()
 
         self.announce = self.get_announce()
diff --git a/haco/control.py b/haco/control.py
index 9e2895b..380f968 100644
--- a/haco/control.py
+++ b/haco/control.py
@@ -1,24 +1,25 @@
 from __future__ import annotations
 
 from dataclasses import dataclass, field
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, TypeVar, Generic, Type, ClassVar
 
 from fmtr.tools.json_tools import to_json
 from haco.base import Base
 from haco.capabilities import Capability
 from haco.obs import logger
-from haco.utils import sanitize_name
+from haco.utils import sanitize_name, Converters, ConvertersBool
 
 if TYPE_CHECKING:
     from haco.device import Device
 
+DeviceT = TypeVar("DeviceT", bound="Device")
 
 @dataclass(kw_only=True)
-class Control(Base):
+class Control(Base, Generic[DeviceT]):
+    converters: ClassVar[Type[Converters]] = ConvertersBool
+
     name: str
-
-
-    device: Device = field(default=None, init=False)
+    device: DeviceT = field(default=None, init=False)
     capabilities: None | list[Capability] = field(default=None, metadata=dict(exclude=True))
     unique_id: str | None = field(default=None, init=False)
     availability_topic: str | None = field(default=None, init=False)
diff --git a/haco/select.py b/haco/select.py
index c49b058..716bd7c 100644
--- a/haco/select.py
+++ b/haco/select.py
@@ -1,6 +1,7 @@
 from dataclasses import dataclass
 
 from haco.control import Control
+from haco.utils import ConvertersString
 
 
 @dataclass(kw_only=True)
@@ -8,6 +9,7 @@ class Select(Control):
     DATA = dict(
         platform='select'
     )
+    converters = ConvertersString
 
     options: list[str]
 
diff --git a/haco/topics.py b/haco/topics.py
index aadfe3f..6ceb323 100644
--- a/haco/topics.py
+++ b/haco/topics.py
@@ -84,14 +84,15 @@ class AnnounceTopicState(AnnounceTopic):
         try:
 
             if is_async:
-                value_raw = await method(value)
+                value = await method(value)
             else:
-                value_raw = method(value)
+                value = method(value)
 
         except NotImplementedError:
             logger.warning(f'No method implemented for {self.capability.control.__class__.__name__}.{self.callback_name}: {self.topic}')
             return
 
+        value_raw = self.capability.converters.state(value)
         await self.capability.control.device.client.publish(self.topic, value_raw)
         return value_raw
 
@@ -107,13 +108,11 @@ class AnnounceTopicCommand(AnnounceTopic):
         method = getattr(self.capability.control, self.callback_name, None)
 
         is_async = aio.is_async(method)
-
-        #test
+        value = message.payload.decode('utf-8')
+        value = self.capability.converters.command(value)
 
         try:
 
-            value = message.payload.decode('utf-8')
-
             if is_async:
                 value_raw = await method(value)
             else:
diff --git a/haco/utils.py b/haco/utils.py
index 4ce9777..45a1002 100644
--- a/haco/utils.py
+++ b/haco/utils.py
@@ -1,5 +1,8 @@
 import string
 from dataclasses import dataclass
+from typing import Callable
+
+from fmtr.tools.datatype_tools import to_bool
 
 CHARS_ALLOWED = string.ascii_lowercase + string.digits
 SEPS = '_- /'
@@ -10,6 +13,9 @@ RECONNECT_DELAY_SEC = 5
 ON = 'ON'
 OFF = 'OFF'
 
+BOOL_MAP = {True: ON, False: OFF}
+
+to_bool_ha = BOOL_MAP.get
 
 def sanitize_name(s, sep='-'):
     chars = []
@@ -28,6 +34,20 @@ def sanitize_name(s, sep='-'):
     return sanitized
 
 
+class Converters:
+    command: Callable = None
+    state: Callable = None
+
+
+class ConvertersBool(Converters):
+    command: Callable = to_bool
+    state: Callable = to_bool_ha
+
+
+class ConvertersString(Converters):
+    command: Callable = str
+    state: Callable = str
+
 @dataclass
 class Metadata:
     exclude: bool = False