# OPCUA Client Action
**URL:** https://discourse.nodered.org/t/opcua-client-action/58076
**Category:** General
**Created:** [10 February 2022 11:09 UTC](https://discourse.nodered.org/t/opcua-client-action/58076 "2022-02-10T11:09:24Z")
**Posts on this page:** 11
**Page:** 1
### Author:  [@FabioT](https://discourse.nodered.org/u/FabioT)
#### Post date: [10 February 2022 11:09 UTC](https://discourse.nodered.org/t/opcua-client-action/58076/1 "2022-02-10T11:09:24Z")
Hi All,
I need some additional info related to client actions available in node-red-contrib-opcua nodes (see attached image).
I need to know how paylod and topic have to be filled in depending on action selected.
Does anyone have some additional info?
Please let me know.
Thank you.
FabioT
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### Author:  [@nico25](https://discourse.nodered.org/u/nico25)
#### Post date: [10 February 2022 12:56 UTC](https://discourse.nodered.org/t/opcua-client-action/58076/2 "2022-02-10T12:56:38Z")
Did you check the description that comes with the node?
It sums up the possible actions in short.
What are you trying to do?
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### Author:  [@FabioT](https://discourse.nodered.org/u/FabioT)
#### Post date: [10 February 2022 13:04 UTC](https://discourse.nodered.org/t/opcua-client-action/58076/3 "2022-02-10T13:04:42Z")
Hi nico25,
I'm trying to solve an initialization server problem that sometime occours (it says something like "...ns=1,s=PLC Data already registered in namespace..."...and I'm trying to understand if there's a way to unregistrer the node that causes the error using an item node.
I'm a novice in both node-red and opcua fields and maybe I'm doing something not in the proper way...
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### Author:  [@nico25](https://discourse.nodered.org/u/nico25)
#### Post date: [11 February 2022 08:26 UTC](https://discourse.nodered.org/t/opcua-client-action/58076/4 "2022-02-11T08:26:11Z")
Did you try sending a message with a topic like "ns=3;s="PLC Data";datatype=XY" to an OPCUA-Client node, set up to unregister? I didn´t work with register/unregister before but the node description doesn´t mention OPCUA-Item for these actions.
As far as I know, registered Nodes are only valid for the current session, so unregistering them should fix your issue.
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### Author:  [@hgyuler](https://discourse.nodered.org/u/hgyuler)
#### Post date: [11 February 2022 11:30 UTC](https://discourse.nodered.org/t/opcua-client-action/58076/5 "2022-02-11T11:30:49Z")
Hello,
I am new in Node-red and trying to use tia-portal as server and connect Node-RED via OPC UA client, but i got an error **"Local 'own' certificate is NOT used"**. Normally i choosed No ´certificate inside the node.
Do you have any idea why it comes ?
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### Author:  [@FabioT](https://discourse.nodered.org/u/FabioT)
#### Post date: [11 February 2022 14:11 UTC](https://discourse.nodered.org/t/opcua-client-action/58076/6 "2022-02-11T14:11:42Z")
Thank you nico25.
I will try to follow your suggestion.
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### Author:  [@nico25](https://discourse.nodered.org/u/nico25)
#### Post date: [14 February 2022 09:59 UTC](https://discourse.nodered.org/t/opcua-client-action/58076/7 "2022-02-14T09:59:09Z")
What are your security settings for opc-ua on the PLC-Side?
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### Author:  [@nico25](https://discourse.nodered.org/u/nico25)
#### Post date: [14 February 2022 10:50 UTC](https://discourse.nodered.org/t/opcua-client-action/58076/10 "2022-02-14T10:50:13Z")
I was replying to @hgyuler here
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### Author:  [@hgyuler](https://discourse.nodered.org/u/hgyuler)
#### Post date: [14 February 2022 12:50 UTC](https://discourse.nodered.org/t/opcua-client-action/58076/11 "2022-02-14T12:50:41Z")
Thank you @nico25 ,
I 'll retry every possibilities, and if I achieve to connect, will let you know.
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### Author:  [@mikakaraila](https://discourse.nodered.org/u/mikakaraila)
#### Post date: [6 March 2022 19:47 UTC](https://discourse.nodered.org/t/opcua-client-action/58076/12 "2022-03-06T19:47:43Z")
This one: **"Local 'own' certificate is NOT used"**
It is only a log message, I just commented it out as people look it as an error.
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### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [5 May 2022 19:47 UTC](https://discourse.nodered.org/t/opcua-client-action/58076/13 "2022-05-05T19:47:45Z")
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