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Questions tagged [open62541]

Used to tag questions related to the open62541 OPC UA stack.

79 questions
3
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1 answer

UA_Client_Service_read only yields empty responses

I am trying to create a small program in C which will poll a frame of data over a opc/ua connection using the open62541 library and the forward it to a kafka server. Everything works fine when fetching the values from the nodes separately but I…
Sebastian
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3
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2 answers

OPC-UA open62541 sdk Add Variable nodes dynamically after run the server

Reading the documentation and examples of the OPC-UA foundation and OPC-UA open62541 sdk, the variables nodes are always added before the statement to start run the server. Is it possible to add them after the server has been started? If I change…
Lucas Santos
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3
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1 answer

OPC-UA Function of "UA_ReadRequest_deleteMembers" Error Problem

Hello Everyone i have one question I Using OPC-UA for client, I have some problem This is Problem code UA_ReadRequest requestPos; UA_ReadRequest_init(&requestPos); UA_ReadValueId idPos; UA_ReadValueId_init(&idPos); idPos.attributeId =…
JeaHwan Chung
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3
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1 answer

Multiple node read in single request from client in open62541

Can anyone tell me the syntax for multiple node read in single request to server in open62541. i have been doing a single read request by UA_Client_readValueAttribute(client, UA_NODEID_STRING(1, "variable"), &value) from the open62541 client to…
TechDev
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2
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1 answer

open62541 client fails when calling method with custom datatype input argument

I'm using open62541 to connect to an OPC/UA server and I'm trying to call methods that a certain object on that server provides. Those methods have custom types as input arguments; for example, the following method takes a structure of three…
Matz
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2
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1 answer

How create *.bsd file in the UaModeler?

Good day. How can we export to BSD in the UaModeler? I can only export to XML and CSV.
AnastasiaA
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2
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1 answer

Async read and write API on Open62541 OPC UA

I am developing an OPC UA client that needs to connect asynchronously to a server and update its node data. I am using UA_Client_connectAsync to connect to the server but the async write/read APIs e.g. UA_Client_writeValueAttribute_async…
Socrates
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2
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2 answers

C type casting from a Ua_Variant

I'm trying to understand what the typecasting is doing in the following code UA_Variant Variant; Int32_t Variable; variable = *(int32_t *) Variant.data; printf("%d", variable); This is the structure of the UA_Variant typedef struct { const…
Parko
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2
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1 answer

open62541: Linker Tool Error for referenced functions

I am trying to get open62541 to work on my Windows 10 machine, but even with this post, I am still struggling. Goal I want to execute a cpp OPC_UA Client with all associated functionalities (CRUD on PLC Variables and so on). Current status I already…
Stephan T.
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2
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1 answer

How to write multiple nodes with OPC-UA at once using open62541?

I am attempting to write multiple nodes in a single request, however I have not found any documentation or examples on how to do that, every time I find anything regarding the issue, a single node is written. Based on my understanding of the…
C. Pinto
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2
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1 answer

Building the Dockerfile executes with non-zero code 139

Description / Reproduction Steps I am trying to run the opc-ua server examle "server_ctt" (using the open62541 library from here) within a docker container on my Raspberry Pi 1, but I am failing at creating the docker image. I followed the…
user7335295
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2
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1 answer

How to add an array of UA_String to the server in open62541

I am trying to set up an OPC server using open62541. The examples are working and I was able to add my own variables to the server. For this project I would like to add a server variable which is an array of UA_String. There are examples for…
Heimetli
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2
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1 answer

Reading Datatype from Node Attribute

I'm trying to write values to some OPC UA nodes with Qt and open62541. For that I have to know the different data types of the nodes. Every time I try to read the data type of a node, I get a Boolean type instead of an int32. It is the correct node…
Henrik
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2
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1 answer

open62541: publish temperature val

I am currently trying to publish a datetime value AND a temperature value with the OPC UA implementation called open62541. For this, I have been using the test example from the open62541 github repository as it is already publishing the current…
user7335295
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2
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1 answer

Integrating open62541 into an existing libev event loop

I have an existing application that makes extensive use of libev for its event loop. I would now like to add OPC UA server functionality, but am unsure how best to integrate the open62541 event loop into libev. The following possibilities come to…
Johannes Zeppenfeld
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