Universal Robots Forum

C4A1: Communication with controller lost - during a webserver HTTP request


We created a URCap that displays an image in the Swing-based UI. We use the URL class to read a file directly from a webserver that is on the same subnet as the robot. This works using the simulator/SDK, but not on the real robot, where we receive a “C4A1” error (see picture). Interestingly, this happens immediately when the image is requested. Any ideas on how to debug this issue? Are HTTP requests allowed from within a URCap?


HTTP requests are allowed.
But could be related to overloading the motherboard…
Could it be possible to lower the load during this call?