AWS-IOT ESP-MDF mbedtls_ssl_handshake returned -0x2700

[sau007007]

Greetings!!!,

I successfully ran AWS-IOT on ESP-IDF using esp-aws-iot. I used Amazon Root CA 1 certificate and deviceCert.crt and deviceCert. It went well.

Now, I am trying to integrate above example into ESP-MDF using same certificates. But I am facing below error:
E (66597) aws_iot: failed! mbedtls_ssl_handshake returned -0x2700
E (66597) aws_iot: Unable to verify the server's certificate.
E (66607) subpub: Error(-4) connecting to xxxxxxxxxxxxgy-ats.iot.us-east-1.amazonaws.com:8883

I tried everything but this error is still present. I tried inserting certificates into in code but still same error is coming.

Please help.

Thanks

[fst202130609]

请问这个问题解决了吗？？？我现在也遇到这个问题，不懂怎么解决了？？？？