Hi @flydragon2021 and thanks for your query. I am afraid that the purchase of a special licence is required to be able to call calibration from the stream engine and so samples are not publically available (and would not work without the licence file)
You can call calibration manually either via the Tobii Interaction System Tray Icon or using the command line Software
`”c:\Program Files (x86)\Tobii\Tobii Configuration\Tobii.Configuration.exe” -Q
Hopefully this workaround will suit your needs. Best Wishes.