(Virtual) robot reader: waiting until data is available

requested review from @patrickhegemann

assigned to @fabian.reister

added 2 commits

• ce7c5f52 - 1 commit from branch master
• 7a32edf9 - Merge remote-tracking branch 'origin/master' into fix/virtual-robot-error-handling

Compare with previous version

mentioned in commit 3eb196f8

merged