LabVIEW
Reading network shared variables from web
You can use Open Variable Connection, Read Variable, Close Variable Connection.
Not sure if that uses websockets? What is the goal?
Search LabVIEW like a graph! You can give curl a try. I think it's build in, at least in my Windows 10, but probably earlier as well.
Although I don't see why the results would be different, it would be a 2nd opinion.
You should also be able to use that URL in a browser. IIRC, you can remove parts from the end of the URL, and get a higher level response. So you might be able to remove from the URL until you get anything, and than build up the URL small steps at a time.
A ping would rule out any network problems.
I'll do some digging, I'm sure I did this a while ago. But most recently I did it for SystemLink, which is similar but with variation on the URL. I'd think the URL is the biggest problem here. I'm sure I put a link to useful info somewhere...
I used (from localhost) this in the past:
http://localhost:3580/nivariable/VariableValues('ni.var.psp://localhost/EtherCAT Master/Mod3/DI1')/Value
So IIRC, port 8080 is used for HTTP, but not for the shared variable engine. 3580 is probably default.
Do you get anything with:
curl "http://Admin:@localhost:3580/nivariable/"
(Admin, "" as credentials) or
curl "http://localhost:3580/nivariable/"
I get XML:
<?xml version="1.0" encoding="iso-8859-1" standalone="yes"?>
<service xml:base="http://localhost:3580/nivariable/" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:app="http://www.w3.org/2007/app" xmlns="http://www.w3.org/2007/app">
<workspace>
<atom:title>Default</atom:title>
<collection href="VariableObjects">
<atom:title>VariableObjects</atom:title>
</collection>
<collection href="VariableValues">
<atom:title>VariableValues</atom:title>
</collection>
<collection href="VariableValueGroups">
<atom:title>VariableValueGroups</atom:title>
</collection>
</workspace>
</service>
Any other request I get """ does not have permission to read VariableValues".
