I've downloaded https://pki.goog/roots.pem and want to use the certificates in it with mbedTLS. Is there some documentation that tells me how to do this?

The certs.c file only contains only a handful of certs, while the PEM file has nearly 40. How do I know which one to use for what purpose? The certs.c file has these certificate char[]'s:

mbedtls_test_ca_crt_ec mbedtls_test_srv_crt_ec mbedtls_test_cli_crt_ec mbedtls_test_ca_crt_rsa mbedtls_test_ca_crt_rsa mbedtls_test_srv_crt_rsa mbedtls_test_cli_crt_rsa

I'm reasonably sure I don't need to replace mbedtls_test_cli_crt_ec and mbedtls_test_cli_crt_rsa, since I am not using a client certificate. But I'm not at all sure about whether I need to replace the 3 *_ca_crt_* certs, the 2 *_srv_crt_* certs, or all 5. And, if so, using which certs from the PEM file to replace which certs in certs.c?. How do I figure out what to do here? I've never dealt with cloud communication like this before, so please pardon my ignorance; I'm eager to learn, but overwhelmed by so much that is new to me.

Thanks,

Jeff Thompson | Senior Electrical Engineer-Firmware +1 704 752 6513 x1394 www.invue.com

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