- set default target unit to '$' - shorten too verbose error message on client - add shutdown method to server and dispatcher Change-Id: Ib3a8b26bc31e988e45a3ff2efd734168d723d794 Reviewed-on: https://forge.frm2.tum.de/review/c/sine2020/secop/playground/+/27095 Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de> Reviewed-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de> Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>