[Interest] QTOPCUA: Received Publish Response with code BadSessionNotActivated

Frank Meerkoetter frank.meerkoetter at basyskom.com
Thu Feb 25 15:40:41 CET 2021

Hi Klaus,

Am 24.02.21 um 17:03 schrieb Klaus Schwarzkopf:
> Hello,
> when i connect to a Siemens SIMATIC S7-1500 SPS, it looks everything 
> good. I can subscribe and receive the values of the subscribed node 
> ids. Also i can change values there, but after some seconds, i get the 
> following warnings and i can't get/set values anymore.
> Environment: Ubuntu 20.04
> How i build qtopcua:
> git clone https://code.qt.io/qt/qtopcua.git
> cd qtopcua
> git checkout 5.12
I would recommend to upgrade to 5.15. 5.11 was the first version with Qt 
OPC UA, so 5.12 is quite "ancient" for this module (which saw a lot of 
development and also upgrades in the underlying stacks).

5.12 still contained 0.3 of open62541 (for which we saw quite a few 
issues with Siemens PLCs).

Please note that you can build 5.15 Qt OPC UA against a 5.12 (might take 
a few minor tweaks).

Kind Regards,

Frank Meerk├Âtter
Development Lead

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