I'm usiing:

#define MBEDTLS_VERSION_NUMBER 0x020D0100
#define MBEDTLS_VERSION_STRING "2.13.1"
#define MBEDTLS_VERSION_STRING_FULL "mbed TLS 2.13.1"

According to RFC5246:

If no suitable certificate is available,
the client MUST send a certificate message containing no
certificates. That is, the certificate_list structure has a
length of zero.

How do I do this with mbedTLS? The example code I have has certificates in it and calls mbedtls_x509_crt_parse(), which wants a list of certificates and will reject a zero-length list.

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