add v1.2 transaction to robotiq, solve beta-robots#5

Author: lianghongzhuo

robotiq_modbus_rtu/src/robotiq_modbus_rtu/robotiqmodbus/client/robotiqrtuframer.py

@@ -44,6 +44,7 @@ def __init__(self, decoder):
         :param decoder: The decoder factory implementation to use
         """
         self.__buffer = b''
+        self._buffer = b''
         self.__header = {}
         self.__hsize = 0x01
         self.__end = b'\x0d\x0a'

robotiq_modbus_rtu/src/robotiq_modbus_rtu/robotiqmodbus/client/sync.py

@@ -5,7 +5,7 @@
 from pymodbus.factory import ClientDecoder
 from pymodbus.exceptions import NotImplementedException, ParameterException
 from pymodbus.exceptions import ConnectionException
-from pymodbus.transaction import FifoTransactionManager
+from .transaction import FifoTransactionManager
 from pymodbus.transaction import DictTransactionManager
 from pymodbus.transaction import ModbusSocketFramer, ModbusBinaryFramer
 from pymodbus.transaction import ModbusAsciiFramer