Installing a Let's Encrypt TLS certificate on a Brother printer automatically with Certbot (& Cloudflare) - OwlTec

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A step-by-step guide to automatically deploying a Let's Encrypt TLS certificate to a Brother printer using a Bash script, Certbot with the Cloudflare DNS plugin, and the open-source Brother Cert tool. The setup runs on macOS with Cronicle as the scheduler. Key considerations include using RSA-2048 keys (required by Brother printers), handling HTTP fallback when the printer has an expired certificate, and separating credentials into isolated .ini files. The script handles certificate acquisition via DNS-01 challenge, copies PEM files to a staging location, converts them to PKCS#12 format, uploads to the printer, and triggers a reboot.