Add trace API for client.

API_changes.rst

@@ -8,7 +8,8 @@ API changes 3.8.0
 - Remove skip_encode parameter.
 - rename ModbusExceptions enums to legal constants.
 - enforce client keyword only parameters (positional not allowed).
-
+- added trace_packet/pdu/connect to client
+- removed on_connect_callback from client
 
 API changes 3.7.0
 -----------------

pymodbus/client/base.py

@@ -5,7 +5,6 @@
 from collections.abc import Awaitable, Callable
 
 from pymodbus.client.mixin import ModbusClientMixin
-from pymodbus.client.modbusclientprotocol import ModbusClientProtocol
 from pymodbus.exceptions import ConnectionException
 from pymodbus.framer import FRAMER_NAME_TO_CLASS, FramerBase, FramerType
 from pymodbus.logging import Log
@@ -25,20 +24,25 @@ def __init__(
         self,
         framer: FramerType,
         retries: int,
-        on_connect_callback: Callable[[bool], None] | None,
         comm_params: CommParams,
+        trace_packet: Callable[[bool, bytes | None], bytes] | None = None,
+        trace_pdu: Callable[[bool, ModbusPDU | None], ModbusPDU] | None = None,
+        trace_connect: Callable[[bool], None] | None = None,
     ) -> None:
         """Initialize a client instance.
 
         :meta private:
         """
         ModbusClientMixin.__init__(self)  # type: ignore[arg-type]
         self.comm_params = comm_params
-        self.ctx = ModbusClientProtocol(
+        self.ctx = TransactionManager(
+            comm_params,
             (FRAMER_NAME_TO_CLASS[framer])(DecodePDU(False)),
-            self.comm_params,
             retries,
-            on_connect_callback,
+            False,
+            trace_packet=trace_packet,
+            trace_pdu=trace_pdu,
+            trace_connect=trace_connect,
         )
         self.state = ModbusTransactionState.IDLE
 
@@ -115,6 +119,9 @@ def __init__(
         framer: FramerType,
         retries: int,
         comm_params: CommParams,
+        trace_packet: Callable[[bool, bytes | None], bytes] | None = None,
+        trace_pdu: Callable[[bool, ModbusPDU | None], ModbusPDU] | None = None,
+        trace_connect: Callable[[bool], None] | None = None,
     ) -> None:
         """Initialize a client instance.
 
@@ -132,7 +139,10 @@ def __init__(
             self.framer,
             retries,
             False,
-            self,
+            trace_packet=trace_packet,
+            trace_pdu=trace_pdu,
+            trace_connect=trace_connect,
+            sync_client=self,
         )
         self.reconnect_delay_current = self.comm_params.reconnect_delay or 0
         self.use_udp = False

pymodbus/client/mixin.py

@@ -2,6 +2,7 @@
 from __future__ import annotations
 
 import struct
+from abc import abstractmethod
 from enum import Enum
 from typing import Generic, TypeVar
 
@@ -48,17 +49,9 @@ class ModbusClientMixin(Generic[T]):  # pylint: disable=too-many-public-methods
     def __init__(self):
         """Initialize."""
 
-    def execute(self,  _no_response_expected: bool, _request: ModbusPDU,) -> T:
-        """Execute request (code ???).
-
-        :raises ModbusException:
-
-        Call with custom function codes.
-
-        .. tip::
-            Response is not interpreted.
-        """
-        raise NotImplementedError("execute of ModbusClientMixin needs to be overridden")
+    @abstractmethod
+    def execute(self,  no_response_expected: bool, request: ModbusPDU,) -> T:
+        """Execute request."""
 
     def read_coils(self, address: int, *, count: int = 1, slave: int = 1, no_response_expected: bool = False) -> T:
         """Read coils (code 0x01).

pymodbus/client/serial.py

@@ -11,6 +11,7 @@
 from pymodbus.exceptions import ConnectionException
 from pymodbus.framer import FramerType
 from pymodbus.logging import Log
+from pymodbus.pdu import ModbusPDU
 from pymodbus.transport import CommParams, CommType
 from pymodbus.utilities import ModbusTransactionState
 
@@ -39,7 +40,12 @@ class AsyncModbusSerialClient(ModbusBaseClient):
     :param reconnect_delay_max: Maximum delay in seconds.milliseconds before reconnecting.
     :param timeout: Timeout for connecting and receiving data, in seconds.
     :param retries: Max number of retries per request.
-    :param on_connect_callback: Function that will be called just before a connection attempt.
+    :param trace_packet: Called with bytestream received/to be sent
+    :param trace_pdu: Called with PDU received/to be sent
+    :param trace_connect: Called when connected/disconnected
+
+    .. tip::
+        The trace methods allow to modify the datastream/pdu !
 
     .. tip::
         **reconnect_delay** doubles automatically with each unsuccessful connect, from
@@ -75,7 +81,9 @@ def __init__(  # pylint: disable=too-many-arguments
         reconnect_delay_max: float = 300,
         timeout: float = 3,
         retries: int = 3,
-        on_connect_callback: Callable[[bool], None] | None = None,
+        trace_packet: Callable[[bool, bytes | None], bytes] | None = None,
+        trace_pdu: Callable[[bool, ModbusPDU | None], ModbusPDU] | None = None,
+        trace_connect: Callable[[bool], None] | None = None,
     ) -> None:
         """Initialize Asyncio Modbus Serial Client."""
         if "serial" not in sys.modules:  # pragma: no cover
@@ -102,7 +110,6 @@ def __init__(  # pylint: disable=too-many-arguments
             self,
             framer,
             retries,
-            on_connect_callback,
             self.comm_params,
         )
 
@@ -127,11 +134,12 @@ class ModbusSerialClient(ModbusBaseSyncClient):
     :param reconnect_delay_max: Not used in the sync client
     :param timeout: Timeout for connecting and receiving data, in seconds.
     :param retries: Max number of retries per request.
+    :param trace_packet: Called with bytestream received/to be sent
+    :param trace_pdu: Called with PDU received/to be sent
+    :param trace_connect: Called when connected/disconnected
 
-    Note that unlike the async client, the sync client does not perform
-    retries. If the connection has closed, the client will attempt to reconnect
-    once before executing each read/write request, and will raise a
-    ConnectionException if this fails.
+    .. tip::
+        The trace methods allow to modify the datastream/pdu !
 
     Example::
 
@@ -166,6 +174,9 @@ def __init__(  # pylint: disable=too-many-arguments
         reconnect_delay_max: float = 300,
         timeout: float = 3,
         retries: int = 3,
+        trace_packet: Callable[[bool, bytes | None], bytes] | None = None,
+        trace_pdu: Callable[[bool, ModbusPDU | None], ModbusPDU] | None = None,
+        trace_connect: Callable[[bool], None] | None = None,
     ) -> None:
         """Initialize Modbus Serial Client."""
         if "serial" not in sys.modules:  # pragma: no cover
@@ -192,6 +203,9 @@ def __init__(  # pylint: disable=too-many-arguments
             framer,
             retries,
             self.comm_params,
+            trace_connect=trace_connect,
+            trace_packet=trace_packet,
+            trace_pdu=trace_pdu,
         )
         self.socket: serial.Serial | None = None
         self.last_frame_end = None

pymodbus/client/tcp.py

@@ -11,6 +11,7 @@
 from pymodbus.exceptions import ConnectionException
 from pymodbus.framer import FramerType
 from pymodbus.logging import Log
+from pymodbus.pdu import ModbusPDU
 from pymodbus.transport import CommParams, CommType
 
 
@@ -31,7 +32,12 @@ class AsyncModbusTcpClient(ModbusBaseClient):
     :param reconnect_delay_max: Maximum delay in seconds.milliseconds before reconnecting.
     :param timeout: Timeout for connecting and receiving data, in seconds.
     :param retries: Max number of retries per request.
-    :param on_connect_callback: Function that will be called just before a connection attempt.
+    :param trace_packet: Called with bytestream received/to be sent
+    :param trace_pdu: Called with PDU received/to be sent
+    :param trace_connect: Called when connected/disconnected
+
+    .. tip::
+        The trace methods allow to modify the datastream/pdu !
 
     .. tip::
         **reconnect_delay** doubles automatically with each unsuccessful connect, from
@@ -64,7 +70,9 @@ def __init__(  # pylint: disable=too-many-arguments
         reconnect_delay_max: float = 300,
         timeout: float = 3,
         retries: int = 3,
-        on_connect_callback: Callable[[bool], None] | None = None,
+        trace_packet: Callable[[bool, bytes | None], bytes] | None = None,
+        trace_pdu: Callable[[bool, ModbusPDU | None], ModbusPDU] | None = None,
+        trace_connect: Callable[[bool], None] | None = None,
     ) -> None:
         """Initialize Asyncio Modbus TCP Client."""
         if not hasattr(self,"comm_params"):
@@ -84,7 +92,6 @@ def __init__(  # pylint: disable=too-many-arguments
             self,
             framer,
             retries,
-            on_connect_callback,
             self.comm_params,
         )
 
@@ -106,12 +113,12 @@ class ModbusTcpClient(ModbusBaseSyncClient):
     :param reconnect_delay_max: Not used in the sync client
     :param timeout: Timeout for connecting and receiving data, in seconds.
     :param retries: Max number of retries per request.
+    :param trace_packet: Called with bytestream received/to be sent
+    :param trace_pdu: Called with PDU received/to be sent
+    :param trace_connect: Called when connected/disconnected
 
     .. tip::
-        Unlike the async client, the sync client does not perform
-        retries. If the connection has closed, the client will attempt to reconnect
-        once before executing each read/write request, and will raise a
-        ConnectionException if this fails.
+        The trace methods allow to modify the datastream/pdu !
 
     Example::
 
@@ -129,7 +136,7 @@ async def run():
 
     socket: socket.socket | None
 
-    def __init__(
+    def __init__(  # pylint: disable=too-many-arguments
         self,
         host: str,
         *,
@@ -141,6 +148,9 @@ def __init__(
         reconnect_delay_max: float = 300,
         timeout: float = 3,
         retries: int = 3,
+        trace_packet: Callable[[bool, bytes | None], bytes] | None = None,
+        trace_pdu: Callable[[bool, ModbusPDU | None], ModbusPDU] | None = None,
+        trace_connect: Callable[[bool], None] | None = None,
     ) -> None:
         """Initialize Modbus TCP Client."""
         if not hasattr(self,"comm_params"):

pymodbus/client/tls.py

@@ -8,6 +8,7 @@
 from pymodbus.client.tcp import AsyncModbusTcpClient, ModbusTcpClient
 from pymodbus.framer import FramerType
 from pymodbus.logging import Log
+from pymodbus.pdu import ModbusPDU
 from pymodbus.transport import CommParams, CommType
 
 
@@ -29,7 +30,12 @@ class AsyncModbusTlsClient(AsyncModbusTcpClient):
     :param reconnect_delay_max: Maximum delay in seconds.milliseconds before reconnecting.
     :param timeout: Timeout for connecting and receiving data, in seconds.
     :param retries: Max number of retries per request.
-    :param on_connect_callback: Function that will be called just before a connection attempt.
+    :param trace_packet: Called with bytestream received/to be sent
+    :param trace_pdu: Called with PDU received/to be sent
+    :param trace_connect: Called when connected/disconnected
+
+    .. tip::
+        The trace methods allow to modify the datastream/pdu !
 
     .. tip::
         **reconnect_delay** doubles automatically with each unsuccessful connect, from
@@ -63,7 +69,9 @@ def __init__(  # pylint: disable=too-many-arguments
         reconnect_delay_max: float = 300,
         timeout: float = 3,
         retries: int = 3,
-        on_connect_callback: Callable[[bool], None] | None = None,
+        trace_packet: Callable[[bool, bytes | None], bytes] | None = None,
+        trace_pdu: Callable[[bool, ModbusPDU | None], ModbusPDU] | None = None,
+        trace_connect: Callable[[bool], None] | None = None,
     ):
         """Initialize Asyncio Modbus TLS Client."""
         if framer not in [FramerType.TLS]:
@@ -84,7 +92,6 @@ def __init__(  # pylint: disable=too-many-arguments
             "",
             framer=framer,
             retries=retries,
-            on_connect_callback=on_connect_callback,
         )
 
     @classmethod
@@ -127,12 +134,12 @@ class ModbusTlsClient(ModbusTcpClient):
     :param reconnect_delay_max: Not used in the sync client
     :param timeout: Timeout for connecting and receiving data, in seconds.
     :param retries: Max number of retries per request.
+    :param trace_packet: Called with bytestream received/to be sent
+    :param trace_pdu: Called with PDU received/to be sent
+    :param trace_connect: Called when connected/disconnected
 
     .. tip::
-        Unlike the async client, the sync client does not perform
-        retries. If the connection has closed, the client will attempt to reconnect
-        once before executing each read/write request, and will raise a
-        ConnectionException if this fails.
+        The trace methods allow to modify the datastream/pdu !
 
     Example::
 
@@ -161,6 +168,9 @@ def __init__(  # pylint: disable=too-many-arguments
         reconnect_delay_max: float = 300,
         timeout: float = 3,
         retries: int = 3,
+        trace_packet: Callable[[bool, bytes | None], bytes] | None = None,
+        trace_pdu: Callable[[bool, ModbusPDU | None], ModbusPDU] | None = None,
+        trace_connect: Callable[[bool], None] | None = None,
     ):
         """Initialize Modbus TLS Client."""
         if framer not in [FramerType.TLS]: