diff --git a/python/src/trezorlib/client.py b/python/src/trezorlib/client.py
index 130b0888ec..f6aafce176 100644
--- a/python/src/trezorlib/client.py
+++ b/python/src/trezorlib/client.py
@@ -189,6 +189,12 @@ class TrezorClient:
             else:
                 raise exceptions.OutdatedFirmwareError(OUTDATED_FIRMWARE_ERROR)
 
+    def _write(self, msg: t.Any) -> None:
+        self.protocol.write(msg)
+
+    def _read(self) -> t.Any:
+        return self.protocol.read()
+
 
 def get_default_client(
     path: t.Optional[str] = None,
diff --git a/python/src/trezorlib/debuglink.py b/python/src/trezorlib/debuglink.py
index 2dbec291ea..3ef845851a 100644
--- a/python/src/trezorlib/debuglink.py
+++ b/python/src/trezorlib/debuglink.py
@@ -968,13 +968,10 @@ class SessionDebugWrapper(Session):
         return self.client
 
     def _write(self, msg: t.Any) -> None:
-        self._session._write(self.debug_client._filter_message(msg))
+        self._session._write(msg)
 
     def _read(self) -> t.Any:
-        resp = self.debug_client._filter_message(self._session._read())
-        if self.debug_client.actual_responses is not None:
-            self.debug_client.actual_responses.append(resp)
-        return resp
+        return self._session._read()
 
     def resume(self) -> None:
         self._session.resume()
@@ -1372,6 +1369,15 @@ class TrezorClientDebugLink(TrezorClient):
 
         next(input_flow)  # start the generator
 
+    def _write(self, msg: t.Any) -> None:
+        super()._write(self._filter_message(msg))
+
+    def _read(self) -> t.Any:
+        resp = self._filter_message(super()._read())
+        if self.actual_responses is not None:
+            self.actual_responses.append(resp)
+        return resp
+
 
 def load_device(
     session: "Session",
diff --git a/python/src/trezorlib/transport/session.py b/python/src/trezorlib/transport/session.py
index 95e12f59d5..50d3162de2 100644
--- a/python/src/trezorlib/transport/session.py
+++ b/python/src/trezorlib/transport/session.py
@@ -186,7 +186,7 @@ class SessionV1(Session):
         self._activate_self()
         if t.TYPE_CHECKING:
             assert isinstance(self.client.protocol, ProtocolV1Channel)
-        self.client.protocol.write(msg)
+        self.client._write(msg)
 
     def _activate_self(self) -> None:
         if self.client._last_active_session is not self:
@@ -197,7 +197,7 @@ class SessionV1(Session):
         assert self.client._last_active_session is self
         if t.TYPE_CHECKING:
             assert isinstance(self.client.protocol, ProtocolV1Channel)
-        return self.client.protocol.read()
+        return self.client._read()
 
     def init_session(self, derive_cardano: bool | None = None) -> None:
         if self.id == b"":
diff --git a/python/src/trezorlib/transport/thp/protocol_and_channel.py b/python/src/trezorlib/transport/thp/protocol_and_channel.py
index 1ce918e893..731caa963e 100644
--- a/python/src/trezorlib/transport/thp/protocol_and_channel.py
+++ b/python/src/trezorlib/transport/thp/protocol_and_channel.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import logging
+import typing as t
 
 from ... import messages
 from ...mapping import ProtobufMapping
@@ -24,3 +25,9 @@ class Channel:
 
     def update_features(self) -> None:
         raise NotImplementedError
+
+    def read(self, timeout: float | None = None) -> t.Any:
+        raise NotImplementedError
+
+    def write(self, msg: t.Any) -> None:
+        raise NotImplementedError