[jira] [Created] (PLC4X-240) Protocol error in reading string

["Stefano Bossi (Jira)" <ji...@apache.org>]

Stefano Bossi created PLC4X-240:
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             Summary: Protocol error in reading string
                 Key: PLC4X-240
                 URL: https://issues.apache.org/jira/browse/PLC4X-240
             Project: Apache PLC4X
          Issue Type: Bug
          Components: Driver-S7
    Affects Versions: 0.8.0
            Reporter: Stefano Bossi
         Attachments: Screenshot 2020-08-20 at 09.35.58.png, captureString_v_0_6_0.pcapng, captureString_v_0_8_0_wrong.pcapng

Dear Christofer,

unfortunately I have found an another issue. 
Via the HelloPlc app I am trying to read a string from my 1200 PLC; here attached you could find the screenshot of the DB as configured in the PLC. 
The command line I am using is:

{code:java}
"--connection-string 's7:tcp://192.168.1.192?controller-type=S7_1200' --field-addresses '%DB1:6.0:STRING'"
{code}

With the library Version 0.8.0 after the patch Julian introduced here: [Pull 175|https://github.com/apache/plc4x/pull/175] which fix the reading of Array of numbers, the reading of Strings doesn't work any more. 
The error I could read via wireshark is:

{noformat}
[Error code: S7 protocol error: Wrong frames (0x8500)]
{noformat}

With the library version 0.6.0 the string is correctly read.
To help you in your work I have attached a capture with both the library version. 
Hope to be useful to fix the bug.

Regards,
Stefano Bossi

P.S. just to let you know, I am trying to read a complex DataBlock and this is the reason I am experimenting with a lot of different types of variables. In the near future I will try to read some many other and to write some too. Unfortunately your code is far too complex for my java knowledge and I am not able to fix the bug by myself but I could test the library and send detailed report if I found some trouble. Hope this could help anyway.  



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