The example application connects to www.google.com:443 server, which sends the following 2 CA certificates during handhsake:
The certificates and the corresponding crls can be downloaded from https://pki.goog/repository/
generate_cert_crl_header_file.py is a reference python script for converting downloaded PEM format certificate/CRL files into C macros in a C header file. The macro can be used in embedded code for loading root CAs and CRLs to tls libraries.