PR #471 Fix transaction tests

Author: sanjay

pymodbus/transaction.py

@@ -228,7 +228,7 @@ def _transact(self, packet, response_length, full=False, broadcast=False):
                 _logger.debug("Changing transaction state from 'SENDING' "
                               "to 'WAITING FOR REPLY'")
                 self.client.state = ModbusTransactionState.WAITING_FOR_REPLY
-            if self.client.handle_local_echo:
+            if self.client.handle_local_echo is True:
                 local_echo_packet = self._recv(size, full)
                 if local_echo_packet != packet:
                     return b'', "Wrong local echo"