update cache in case of connection errors, as they are not handled in the rx thread Change-Id: Icf3377020ec314fcef2982a4e6dc64356f787273 Reviewed-on: https://forge.frm2.tum.de/review/c/secop/frappy/+/33744 Reviewed-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de> Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de> Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>