Hi @Evgeniy_Vasyliev
The error you are encountering is:
programs/util/strerror -0x3B00
Last error was: -0x3b00 - PK - The pubkey tag or value is invalid (only RSA and EC are supported)
It is cause by a parsing error of you certificate.
Could this be related to your other post and you have memory issues on your platform?
Regards,
Mbed TLS Team member
Ron