[Interest] QTOPCUA: Received Publish Response with code BadSessionNotActivated

Klaus Schwarzkopf klaus.schwarzkopf at sensortherm.de
Thu Feb 25 22:37:56 CET 2021

Hello Frank,

i upgrade to 5.12.2 and fixed the bugs, but i have still problems. If 
you want, i can share the patch.

Then i installed the packages from https://open62541.org/ and made 
qtopcua working, but i got the same problems.

sudo add-apt-repository ppa:open62541-team/ppa
sudo apt-get update
sudo apt-get install libopen62541-1-dev

Then i used wireshark to record the network traffic.


Maybe it helps to find the error.

Best regards,


On 25.02.21 14:40, Frank Meerkoetter wrote:
> 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

Sensortherm GmbH
Weißkirchener Straße 2-6
D-61449 Steinbach

Registergericht:/Registry office: Amtsgericht Frankfurt/M.
Eintragungs-Nr.:/Registry-No. HRB 52438
Geschäftsführer:/General Manager: Benjamin Wuttke

More information about the Interest mailing list