venv added, updated

myenv/lib/python3.12/site-packages/pymodbus/framer/socket.py

@@ -0,0 +1,44 @@
+"""Modbus Socket frame implementation."""
+from __future__ import annotations
+
+from pymodbus.framer.base import FramerBase
+from pymodbus.logging import Log
+
+
+class FramerSocket(FramerBase):
+    """Modbus Socket frame type.
+
+    [         MBAP Header         ] [ Function Code] [ Data ]
+    [ tid ][ pid ][ length ][ uid ]
+      2b     2b     2b        1b           1b           Nb
+
+    * length = uid + function code + data
+    """
+
+    MIN_SIZE = 8
+
+    def decode(self, data: bytes) -> tuple[int, int, int, bytes]:
+        """Decode ADU."""
+        if (used_len := len(data)) < self.MIN_SIZE:
+          Log.debug("Very short frame (NO MBAP): {} wait for more data", data, ":hex")
+          return 0, 0, 0, self.EMPTY
+        msg_tid = int.from_bytes(data[0:2], 'big')
+        msg_len = int.from_bytes(data[4:6], 'big') + 6
+        msg_dev = int(data[6])
+        if used_len < msg_len:
+          Log.debug("Short frame: {} wait for more data", data, ":hex")
+          return 0, 0, 0, self.EMPTY
+        if msg_len == 8 and used_len == 9:
+            msg_len = 9
+        return msg_len, msg_tid, msg_dev, data[7:msg_len]
+
+    def encode(self, pdu: bytes, device_id: int, tid: int) -> bytes:
+        """Encode ADU."""
+        packet = (
+           tid.to_bytes(2, 'big') +
+           b'\x00\x00' +
+           (len(pdu) + 1).to_bytes(2, 'big') +
+           device_id.to_bytes(1, 'big') +
+           pdu
+        )
+        return packet