Bug in parsing error responses.

[ch82]

bugs in parsing error responses. pymodbus don't check func_code >=0x80
from pymodbus.factory import ClientDecoder
from pymodbus.transaction import ModbusTransactionManager , ModbusRtuFramer
framer = ModbusRtuFramer(ClientDecoder())
data='\x00\x90\x02\x00\x01i' #error response from device
framer.processIncomingPacket(data,None)

./bug.py
Traceback (most recent call last):
File "bug.py", line 8, in
framer.processIncomingPacket(data,None)
File "build\bdist.win32\egg\pymodbus\transaction.py", line 425, in processIncomingPacket
File "build\bdist.win32\egg\pymodbus\transaction.py", line 328, in checkFrame
File "build\bdist.win32\egg\pymodbus\transaction.py", line 370, in populateHeader
AttributeError: 'NoneType' object has no attribute 'calculateRtuFrameSize'

This exception is caused by code pdu_class = self.decoder.lookupPduClass(func_code) in transaction.py line 369
ClientDecoder.lookupPduClass at line 181 knows nothing about errors(0x80+func) and returns None...

[bashwork]

You are correct. There was new coded added so that RTU could get the function type, and I forgot to check for the exception messages. This is fixed with a588b88.