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IndexError: string index out of range #211

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dhoomakethu opened this issue Sep 1, 2017 · 1 comment
Closed

IndexError: string index out of range #211

dhoomakethu opened this issue Sep 1, 2017 · 1 comment
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@dhoomakethu
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dhoomakethu commented Sep 1, 2017 •
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Once in a while pymodbus throw this error

File "/Users/sanjay/.virtualenvs/huduku/lib/python2.7/site-packages/pymodbus/client/sync.py", line 85, in execute
    return self.transaction.execute(request)
  File "/Users/sanjay/.virtualenvs/huduku/lib/python2.7/site-packages/pymodbus/transaction.py", line 150, in execute
    self.client.framer.processIncomingPacket(result, self.addTransaction)
  File "/Users/sanjay/.virtualenvs/huduku/lib/python2.7/site-packages/pymodbus/transaction.py", line 672, in processIncomingPacket
    self._process(callback, error=True)
  File "/Users/sanjay/.virtualenvs/huduku/lib/python2.7/site-packages/pymodbus/transaction.py", line 692, in _process
    result = self.decoder.decode(data)
  File "/Users/sanjay/.virtualenvs/huduku/lib/python2.7/site-packages/pymodbus/factory.py", line 223, in decode
    return self._helper(message)
  File "/Users/sanjay/.virtualenvs/huduku/lib/python2.7/site-packages/pymodbus/factory.py", line 245, in _helper
    response.decode(data[1:])
  File "/Users/sanjay/.virtualenvs/huduku/lib/python2.7/site-packages/pymodbus/pdu.py", line 189, in decode
    self.exception_code = byte2int(data[0])
IndexError: string index out of range

another one

File "/Users/sanjay/.virtualenvs/huduku/lib/python2.7/site-packages/pymodbus/client/sync.py", line 85, in execute
    return self.transaction.execute(request)
  File "/Users/sanjay/.virtualenvs/huduku/lib/python2.7/site-packages/pymodbus/transaction.py", line 150, in execute
    self.client.framer.processIncomingPacket(result, self.addTransaction)
  File "/Users/sanjay/.virtualenvs/huduku/lib/python2.7/site-packages/pymodbus/transaction.py", line 672, in processIncomingPacket
    self._process(callback, error=True)
  File "/Users/sanjay/.virtualenvs/huduku/lib/python2.7/site-packages/pymodbus/transaction.py", line 692, in _process
    result = self.decoder.decode(data)
  File "/Users/sanjay/.virtualenvs/huduku/lib/python2.7/site-packages/pymodbus/factory.py", line 223, in decode
    return self._helper(message)
  File "/Users/sanjay/.virtualenvs/huduku/lib/python2.7/site-packages/pymodbus/factory.py", line 245, in _helper
    response.decode(data[1:])
  File "/Users/sanjay/.virtualenvs/huduku/lib/python2.7/site-packages/pymodbus/register_read_message.py", line 87, in decode
    byte_count = byte2int(data[0])
IndexError: string index out of range
@dhoomakethu
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Not reproducicble

ccatterina pushed a commit to ccatterina/pymodbus that referenced this issue Apr 17, 2018
Handle the reception of incomplete responses.
719d3fb 
If an incomplete response is received strange things happened
(e.g. receiving 0xFF raise an IndexError, receiving 0x011012
raise a struct.error).
Now if an incomplete response is received an error is logged.

Related to discussion in pymodbus-dev#188 , Fix pymodbus-dev#211
ccatterina pushed a commit to ccatterina/pymodbus that referenced this issue Apr 18, 2018
Handle the reception of incomplete responses.
fd4e348 
If an incomplete response is received strange things happened
(e.g. receiving 0xFF raise an IndexError, receiving 0x011012
raise a struct.error).
Now if an incomplete response is received an error is logged.

Related to discussion in pymodbus-dev#188 , Fix pymodbus-dev#211
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