I wanted to install a certificate generated by Let's encrypt on my brand new laser printer (HP Laserjet MFJ 4302) for the integrated administration webserver. After research on the web, I discovered

Arguments

positional arguments: {csr,pem} command help csr Create CSR pem Install certificate

options: -h, --help show this help message and exit -d, --debug Activate debug. -c, --config CONFIG_FILENAME Configuration file. -u, --user USERNAME Username. -p, --password [PASSWORD] Password. -H, --host HOSTNAME Hostname. -n, --no-tls-verification Verify certificate validity.

How to use it ?

To obtain a CSR:

./refresh-certificate.py  -c ./config.ini -n -p PASSWORD csr

To obtain a PEM certificate from Let's encrypt:

certbot certonly --webroot -w /var/www/letsencrypt/ --csr printer.csr

To install the PEM file on the printer:

./refresh-certificate.py  -c ./config.ini -n -p PASSWORD pem