openssl pkcs12 -export -in /root/letsencrypt/certs/tzsz_de/cert.pem -inkey /root/letsencrypt/certs/tzsz_de/privkey.pem -out /root/letsencrypt/certs/tzsz_de/drucker.pfx -name drucker.tzsz.de -passout pass:certpass
curl -v --insecure -u admin:webpass https://drucker.tzsz.de/hp/device/Certificate.pfx --form upload=@/root/letsencrypt/certs/tzsz_de/drucker.pfx --form Password=certpass

Von

Securing an HP LaserJet printer with LetsEncrypt

Installing TLS certificates on HP printers automatically

PDFs zu den Links

Securing an HP LaserJet printer with LetsEncrypt – Peter Hicks‘ Blog

Installing TLS certificates on HP printers automatically – Peter Hicks‘ Blog