Methods to transfer data of Service Web Application LV?

What methods do people have found it more useful to transfer data Services Web of LabVIEW and their instance of the main application? I have a project using LV RT and I would like to be able to send data to the target RT via HTTP requests.

I found surprisingly little information on the different available methods / best practices for this and there aren't something I tried to do before - I use mostly of Web Services for hosting of static content that uses my library WebSockets.

These are the methods that I know:

-Static Variables: the only information of OR , I could find on the way to proceed was to create two shared variables, one for the RT, one for the Web Service and alias them. It seems ridiculous and is useful for data "tag.

- File: write data to a file within the web service and read out in the application. Therefore, the file/folder for querying data.

- TCP/UDP: write a Manager TCP/UDP in the application that listens to incoming connections, then create the connection and send the data inside the web service VI.

- Server of VI: I saw a presentation here that speaks using Server VI (slide 8), but when I tried to get a queue named within the VI (using the instance of the application open / open reference vi at the request on port 4000), I get error 1100 (no queue found with the same name) of the published web service It does not seem to complain about not being able to connect to the instance of the application. Executes the VI locally or from the debug server works. See the attached project (LV2013) for what I tried.

So, the question is - why my VI Server method does not work when it should (according to this presentation, I couldn't find the examples mentioned) and what methods people have used and had success with? I was hoping that the last method would be to succeed because it means I can push data directly into an existing queue manager, would be a fairly light and medium solution, I wouldn't need to write a custom file manager / network.

OK - after playing more - I had no wired 'localhost' to the instance of the application open VI I thought I passed by default to "localhost" rather than "this instance of the application. Then I got the "VI Server Access is denied" and added * to the exported VIs list and it worked.

Always curious to hear other methods / thoughts / success though.

Tags: NI Software

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