OPC UA Server for FANUC FOCAS

Fixed an issue in the monitored items handler configuration. Due to an implementation error, the background worker responsible for polling the CNC controller was not running when subscriptions were created. As a result, the server cache was not populated, forcing the OPC UA server to perform synchronous reads from the controller for every client request. This could lead to slower response times and client timeouts under heavy load. The issue has been resolved. Background polling and the caching mechanism now operate correctly, even with a large number of subscriptions and monitored items.