Log comm retries. (#2220)

Author: janiversen

pymodbus/transaction.py

@@ -223,6 +223,7 @@ def execute(self, request):  # noqa: C901
                         else:
                             break
                         # full = False
+                        Log.debug("Retry getting response: - {}", _buffer)
                     addTransaction = partial(  # pylint: disable=invalid-name
                         self.addTransaction,
                         tid=request.transaction_id,