From ODL documentation below:

https://wiki.opendaylight.org/view/OpenDaylight_Controller:SSL_RestConf

to create keystore

use "keytool -keystore .keystore -alias jetty -genkey -keyalg RSA -validity 3650"

describe how to  migrate to https for ODL RestConf

for more details to setup https:

https://docs.opendaylight.org/en/stable-neon/getting-started-guide/security_considerations.html