Remove param.

pymodbus/payload.py

@@ -330,9 +330,6 @@ def _unpack_words(self, handle) -> bytes:
         # Change Word order if little endian word order  #
         # Pack values back based on correct byte order   #
         # ---------------------------------------------- #
-
-        :param handle: Value to be unpacked
-        :return:
         """
         if Endian.LITTLE in {self._byteorder, self._wordorder}:
             handle = array("H", handle)

pymodbus/transaction.py

@@ -41,9 +41,18 @@
 # The Global Transaction Manager
 # --------------------------------------------------------------------------- #
 class ModbusTransactionManager:
-    """Implement a transaction for a manager.
+    """Implement a transaction manager.
 
-    Results are keyed based on the supplied transaction id.
+    Only 1 request can be active at any time, the reasoning being:
+
+    - of the 4 official framer types only socket support transactions
+    - Only few devices with tcp/ip accept multiple transactions
+    - majority of these devices simply queue the requests, no parallel execution
+
+    So in total it is a very low percentage that would benefit from a proper transaction handler,
+    meaning it does not make sense to support it.
+
+    The transaction manager support multiple client requests with automatic queing!
     """
 
     def __init__(self):
@@ -136,7 +145,7 @@ class SyncModbusTransactionManager(ModbusTransactionManager):
     def __init__(self, client: ModbusBaseSyncClient, retries):
         """Initialize an instance of the ModbusTransactionManager."""
         super().__init__()
-        self.client: ModbusBaseSyncClient = client
+        self.client = client
         self.retries = retries
         self._transaction_lock = RLock()
         self._no_response_devices: list[int] = []
@@ -146,6 +155,7 @@ def __init__(self, client: ModbusBaseSyncClient, retries):
     def _set_adu_size(self):
         """Set adu size."""
         # base ADU size of modbus frame in bytes
+
         if isinstance(self.client.framer, ModbusSocketFramer):
             self.base_adu_size = 7  # tid(2), pid(2), length(2), uid(1)
         elif isinstance(self.client.framer, ModbusRtuFramer):