Lots of Siemens, and other industrial component vendor , controllers support OPC-UA. Is there a connector available or are there any plans to have this in the near future? We have a software server which supports OPC-UA and in order to integrate with Mendix we’d either need to replace the support to REST or go for a OPC-UA connector.
Not to my knowledge. I recently started in a team in Mendix that works closely with Siemens, providing different teams within Siemens with all the solutions to build apps using Mendix. I haven't heard of OPC-UA before, but if this is something that is used a lot, it makes sense to build a connector. Currently there are no plans to do that, yet.
If there are useful Java libraries available to communicate through OPC-UA, we could start a community driven connector kit for that (our team only facilitates Siemens, the ownership of the solutions are with Siemens, hence I propose a Community driven approach on Github)