OpcServer | Open Pixel Control server for Arduino
kandi X-RAY | OpcServer Summary
kandi X-RAY | OpcServer Summary
Open Pixel Control (OPC) server for Arduino. Compatible with boards that utilize Arduino style WiFiServer / WiFiClient APIs.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of OpcServer
OpcServer Key Features
OpcServer Examples and Code Snippets
Community Discussions
Trending Discussions on OpcServer
QUESTION
I downloaded the sample code from GitHub and modified the ReadNodeExample.java just to make sure that I can connect to an OPC Server (not Milo, it's a C#-based OPC Server). I was able to verify that the sample code is able to read/write/call nodes from my server with the modifications.
I then reimplemented what I thought I needed into my actual project, but I might be missing something since I cannot connect under this project and receive the following error:
java.lang.NoSuchMethodError: 'io.netty.buffer.ByteBuf io.netty.buffer.ByteBuf.writeMediumLE(int)'
This error happens in the ClientExampleRunner.run() while running createClient() I can still run the sample project and still connects.
Here's my pom.xml: The org.milo is added near the end and I added what I saw was added from the sample (included ch.qos.logback and jetbrains). Then added the io.netty thinking it would help, but still have the same error.
...ANSWER
Answered 2022-Mar-21 at 22:29It seems that your actual project has an old version of Netty somewhere on its classpath.
ByteBuf::writeMediumLE (and all the other LE-suffixed ByteBuf methods) were introduced in Netty 4.1.
QUESTION
I am tring to write OPCClient, but the problem is in memory leak.
This is my function to read values from OPCServer
ANSWER
Answered 2021-Jul-16 at 16:45It may not be the full answer (it depends on the kind of data inside the value), but before doing CoTaskMemFree(pItemValue), you should also do VariantClear(pItemValue->vDataValue). That's a possible leak in the Read part, but it will only show itself with strings or other kinds of VARIANTs that have additional pointer in itself.
But, if you are looking for a leak related to AddItems: You are not freeing the pErrors that you get from AddItems. You are only freeing the pErrors you get from Read.
QUESTION
Below is an OPC Client written in VBA. It is using the OPC Foundation DA libraries. I am able to get the current value of the item (I can read it in locals window), but it is not assigning the value to myValue = theItem.Value Hovering over theItem.Value during a break shows the value as well.
Any thoughts?
...ANSWER
Answered 2021-May-26 at 15:23After review/trouble shooting.
The OPCItem object provides methods to read the current value of the item in the server and write a new value to the item. I have included these facilities into this dialog. The read method provided on an OPCItem object performs a synchronous read from the server and can be configured to read either from cache or from the device. To read from cache both the group and item should be active, but synchronous read operations directly from the device do not depend on the active state of either the group or item.
Adding the following code allowed me to assign to variable.
QUESTION
I keep getting "Additional text encountered after finished reading JSON content" when deserializing. I've tried placing the whole "output" into square brackets, didn't work out.
Full error message
...ANSWER
Answered 2021-May-07 at 09:37For me it looks like your output is wrong. Its an array of objects (multiple groups) so it should be surrounded by [ and ] and each object separated by a comma (,).
Your output should look like this:
QUESTION
ANSWER
Answered 2020-Nov-23 at 11:49Writing this helped me to solve this issue
QUESTION
I have some XML that I want to replace.
Below, I want to replace "Alarm" within with the name of the Tag to which it belongs.
E.g. for the first Tag below, the Tag name is "Buffer Tank Pig Catcher Equipment Fault"
So the Alarm name would need to be set to "Buffer Tank Pig Catcher Equipment Fault" as well. I plan to use notepad++, so I need to use capture groups in order to put it all back together.
I have a regex saved on regexr: regexr.com/58ac5
...ANSWER
Answered 2020-Jul-13 at 09:58Your middle term (with the giant character class) has a quantifier of +, which is greedy and so will match/consume everything possible (including any intermediate terminating blocks) while still matching.
Change the quantifier to +?, which is reluctant and so will match/consume a little as possible while still matching, so preventing it from skipping over potential terminating text blocks.
QUESTION
My matlab application communicates with dymola software (for dynamic modeling/simulation/calculation) by giving inputs and fetching outputs. Everything working fine in Matlab command window. The standalone application developed in the matlab (using Application compiler) works fine in the same system as the one it was developed in. Once I install the application (with matlab runtime) into an host system without the full matlab installation, The OPC code fails. * Code developed/compiled in : Windows 10 Pro, * deployed to/Host system : Windows 10 Pro, * Matlab version 2017b * OPC toolbox version 4.0.4 * Matlab runtime 9.3
The OPC code snippet is as follows:
...ANSWER
Answered 2020-Feb-29 at 11:59I was able to solve the problem by installing the OPC core components manually.
Installing them before running the Matlab exe, solved the problem.
P.S. You need to create an account before downloading the OPC core components.
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