I was able to successfully connect to the ChirpStack v3 MQTT broker without credentials using a Hubitat home automation hub client.
After updating to ChirpStack v4, I generated the newly-required CA, client, and private key certificates so I could again connect to the MQTT broker with my Hubitat client. However, my Hubitat client requires a private key in pkcs1 format rather than pkcs8. (See attached screenshot.) When I try to convert the pkcs8 key to pkcs1, I get an error:
raspberrypi4:~$ openssl rsa -in pkcs8.pem -out pkcs1.pem
Not an RSA key
I tried also tried converting the pkcs8.pem file using online tools, but they also generated an error.
The pkcs8.pem file contents:
-----BEGIN PRIVATE KEY-----
-----END PRIVATE KEY-----