I am trying to connect to AWS using the sample AWS IoT on nRF9160-DK. The certificate used for connection is a certificate issued by AWS. "E: aws_iot_connect, error: -119" is displayed and I cannot connect. The certificate issued by AWS is set in the following file. ①ca-cert.pem: Root CA certificate ②client-cert.pem:Device certificate ③private-key.pem: Private key file However, I am not sure if I have configured it correctly. How should I list the certificate contents in each file?