You can refer to the Control Centre application which is open source.
You can see how it implements Vendor commands.
after installing Cypress Suite USB. you will find it at the location: C:\Cypress\Cypress Suite USB 3.4.7\CyUSB.NET\examples\Control Center.
Unfortunaly, i can understand well c# language. Eventhough, i try find vendor command to refer it from control center.
But i can not find. Exactlly, where am i refer code from that code exactlly?
Could you please let me know?
For vendor commands implementation, you can also refer to the FxEEPROM application with the other examples on C++.
In this go to MainF.cpp file and see te vendor commands A9 and A2 are being used to download code to the EEPROM (after vendax.hex is downloaded to the RAM).
I hope this helps.