Unable to read client key file

[ctron]

Expected behavior

Use --key to pass in a key for X.509 client certificate authentication.

Actual behavior

$ mqtt pub -v -h localhost -p 8883 --cert device.1.crt --key device.1.key --cafile ca-bundle.pem -t temp -m '{\"temp\":42}'
Invalid value for option '--key': cannot convert 'device.1.key' to PrivateKey (The private key could not be recognized.)
Try 'mqtt pub --help' for more information.
$ head device.1.key
-----BEGIN PRIVATE KEY-----
…

--help gives me:

      --cert <clientCertificate>
                            The client certificate to use for client side authentication
      --key <clientPrivateKey>
                            The path to the client private key for client side authentication

If there is a specific format required, I would expect this to be mentioned in the help.

To Reproduce

Steps

Run the example above.

Reproducer code

Details

• Affected MQTT CLI version(s):

  4.4.1
  Picocli 4.5.0
  JVM: 11.0.9.1 (Red Hat, Inc. OpenJDK 64-Bit Server VM 11.0.9.1+11)
  OS: Linux 5.9.16-200.fc33.x86_64 amd64
  

• Used JVM version:

  openjdk 11.0.9.1 2020-11-04
  OpenJDK Runtime Environment 18.9 (build 11.0.9.1+11)
  OpenJDK 64-Bit Server VM 18.9 (build 11.0.9.1+11, mixed mode, sharing)
  

[gitseti]

Hi @ctron and thanks for the Issue!

This is a known issue with reading in unencrypted .pem files which will be fixed in the upcoming version: See #185
For now you could just use an encrypted pem file instead or just wait for the upcoming version.

Therefore, I will close this for now.