Move transports into their own package (#1247)

This moves all transport implementations into a new `transports` package
for cleaner main package & easier to understand project structure.

kasa/protocol.py

@@ -18,7 +18,7 @@ import hashlib
 import logging
 import struct
 from abc import ABC, abstractmethod
-from typing import Any, Callable, TypeVar, cast
+from typing import TYPE_CHECKING, Any, Callable, TypeVar, cast
 
 # When support for cpython older than 3.11 is dropped
 # async_timeout can be replaced with asyncio.timeout
@@ -32,6 +32,10 @@ _UNSIGNED_INT_NETWORK_ORDER = struct.Struct(">I")
 _T = TypeVar("_T")
 
 
+if TYPE_CHECKING:
+    from .transports import BaseTransport
+
+
 def redact_data(data: _T, redactors: dict[str, Callable[[Any], Any] | None]) -> _T:
     """Redact sensitive data for logging."""
     if not isinstance(data, (dict, list)):
@@ -75,49 +79,6 @@ def md5(payload: bytes) -> bytes:
     return hashlib.md5(payload).digest()  # noqa: S324
 
 
-class BaseTransport(ABC):
-    """Base class for all TP-Link protocol transports."""
-
-    DEFAULT_TIMEOUT = 5
-
-    def __init__(
-        self,
-        *,
-        config: DeviceConfig,
-    ) -> None:
-        """Create a protocol object."""
-        self._config = config
-        self._host = config.host
-        self._port = config.port_override or self.default_port
-        self._credentials = config.credentials
-        self._credentials_hash = config.credentials_hash
-        if not config.timeout:
-            config.timeout = self.DEFAULT_TIMEOUT
-        self._timeout = config.timeout
-
-    @property
-    @abstractmethod
-    def default_port(self) -> int:
-        """The default port for the transport."""
-
-    @property
-    @abstractmethod
-    def credentials_hash(self) -> str | None:
-        """The hashed credentials used by the transport."""
-
-    @abstractmethod
-    async def send(self, request: str) -> dict:
-        """Send a message to the device and return a response."""
-
-    @abstractmethod
-    async def close(self) -> None:
-        """Close the transport.  Abstract method to be overriden."""
-
-    @abstractmethod
-    async def reset(self) -> None:
-        """Reset internal state."""
-
-
 class BaseProtocol(ABC):
     """Base class for all TP-Link Smart Home communication."""