Hi @sandor_b
Since the HSE firmware installation is typically done only once, I recommend creating a separate project. As for updating the HSE firmware, there should be no issues integrating it into your main application.
For clarity, the S32K3 MCUs for General Purpose HSE Demo Examples are provided as separate applications for each use case, demonstrating how each works independently.
Additionally, we provide AWS libraries and an MbedTLS package (with HSE) for the S32K3 product, which includes demo examples that integrate the RTD Driver, HSE Firmware, TCP/IP Stack, and RTOS. These resources might be useful for your application development. It can be downloaded from:
S32K3 Reference Software > Automotive SW - S32K3 - AWS IoT or Automotive SW - S32K3 - mbedTLS.
BR, VaneB