All boxes in simple-visualization are not working when acquisition server and designer are not on the same machine....
All the boxes in extras/plugins/processing/simple-visualization/src/box-algorithms have hard wired values of (host,port) to ("localhost",15361). This cannot be changed in any way. Only the box ovpCBoxAlgorithmP300MagicCardVisualization has parameters for this, but they are not used...
So either the limitation of these boxes needs to be documented (and the host/port parameters in ovpCBoxAlgorithmP300MagicCardVisualization needs to be removed), or similar host/port parameters need to be added to all boxes (and used!).