Migration Module 8.1.X to 8.3.X

Hi, I'm looking for the Gateway 8.3.X .jar extension from https://mvnrepository.com/artifact/com.inductiveautomation.ignition/gateway to compile my project and point it to the new namespaces, but I can't find it. Could someone tell me how to solve this?

Have you looked at GitHub - inductiveautomation/ignition-sdk-examples: Ignition SDK Example Projects yet?

You should be using Maven or Gradle, and configuring the IA Nexus repositories like this:

Then your project should just point to the Ignition SDK pom artifacts.

I previously had a section in the UI configuration. In version 8.3, how would I create this section, and where would this configuration be displayed? I've followed the examples, but it's not showing me anything.

You need to follow this specific example:

Yes, as an example, it is so thin as to be practically transparent, but the critical details are there. (It adds a general menu entry to launch the example page.)

Everything you knew about v8.1's Wicket UI is entirely abandoned. You have to start over with React.

Thanks for the example. My question is how to combine what I design in React with persistent variables, and have them accessed from the Gateway.

You have to add API routes to exchange information between React on the front end and Java on the backend. Typically in JSON format, but up to you.