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https://issues.apache.org/jira/browse/PLC4X-240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17181022#comment-17181022
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Stefano Bossi commented on PLC4X-240:
-------------------------------------
Thanks!!!!
Regards,
S.
> 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
> Assignee: Christofer Dutz
> Priority: Major
> 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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