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Posted to issues@plc4x.apache.org by "Christofer Dutz (Jira)" <ji...@apache.org> on 2021/08/25 13:37:00 UTC

[jira] [Commented] (PLC4X-311) ADS driver lost with short replies for read requests

    [ https://issues.apache.org/jira/browse/PLC4X-311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17404449#comment-17404449 ] 

Christofer Dutz commented on PLC4X-311:
---------------------------------------

Perhaps we need to add an identification step in the login procedure to detect if it's a TC2 or TC3 device and to use the "Multi-Item-To-Single-Item-Request" thingy for older versions?

> ADS driver lost with short replies for read requests
> ----------------------------------------------------
>
>                 Key: PLC4X-311
>                 URL: https://issues.apache.org/jira/browse/PLC4X-311
>             Project: Apache PLC4X
>          Issue Type: Bug
>          Components: Driver-ADS
>    Affects Versions: 0.9.0
>            Reporter: Łukasz Dywicki
>            Priority: Major
>              Labels: regresion
>         Attachments: amsads-shortanswer.pcapng
>
>
> I began testing functionality which did work with ADS driver in 0.6 release. Part of the test was reading address {{0xf00f/0x0}} (it is elsewhere referred as {{SYM_UPLOADINFO2}}) which returns up to 24 bytes of data. First 4 is symbol count, next 4 is symbol list length. Not sure what are remaining ones.
> I made an attempt to read less than 24 bytes. All requests which query below 24 bytes get response which do not contain index group and offset.
> I attach PCAP which clearly indicates issue.



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