I make a CA certificate for JITR using BouncyCastle lib in the android app as the below example And a device certificate is generated by this certificate in mbed_tls. At this time, JITR is not working. Namely, a device certificate is not registered in AWS. But In the case of making a ca certificate using OPENSSL, JITR works normally. Below is CA certificate based BouncyCastle lib.
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
-----BEGIN EC PRIVATE KEY-----
MIGTAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBHkwdwIBAQQgU9pUZUfplZyhC+mH
Pt8pthLItdpbJ+Qy47r7gJKTNvCgCgYIKoZIzj0DAQehRANCAARJJ2HaiNwnVZZj
JE5qikutx5x3OT28gX39UaJBhujROs99YpQPGLdnxhRyJZ9ZELcf/+rLQQNWyKoq
rEqPMGne
-----END EC PRIVATE KEY-----
BRs.
Hyunung Park