Add connection exception to list of exceptions catpured in retries (#2113)

Author: johnmiko

pymodbus/transaction.py

@@ -18,6 +18,7 @@
 from threading import RLock
 
 from pymodbus.exceptions import (
+    ConnectionException,
     InvalidMessageReceivedException,
     ModbusIOException,
 )
@@ -325,7 +326,7 @@ def _transact(self, packet, response_length, full=False, broadcast=False):
             result = self._recv(response_length, full)
             # result2 = self._recv(response_length, full)
             Log.debug("RECV: {}", result, ":hex")
-        except (OSError, ModbusIOException, InvalidMessageReceivedException) as msg:
+        except (OSError, ModbusIOException, InvalidMessageReceivedException, ConnectionException) as msg:
             self.client.close()
             Log.debug("Transaction failed. ({}) ", msg)
             last_exception = msg