allow to define default settings on the IO class: - a default 'port' may be given for tcp - defaults like 'baudrate' or 'parity' might be given for serial connections this avoids explicit settings in the config file in case the settings can not be changed or have a typical value other than the defaults in serial.Serial Change-Id: I990f47d63e785f8cc48c4af197944a8eebe91fb4 Reviewed-on: https://forge.frm2.tum.de/review/c/secop/frappy/+/30555 Reviewed-by: Georg Brandl <g.brandl@fz-juelich.de> Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de> Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>