https://martinkonicek.eu/categories/homelab/ Recent content in Homelab on Martin Koníček | Cloud Architect · DevOps · AI · Python Hugo cs Tue, 19 May 2026 00:00:00 +0000 https://martinkonicek.eu/archive/brother-printer-android/ Tue, 19 May 2026 00:00:00 +0000 https://martinkonicek.eu/archive/brother-printer-android/ <p>You have a Brother printer plugged into a Linux box on your home network, and you want to print from your Android phone without fiddling with cables or third-party apps. This is doable with CUPS, nginx, and Avahi — but there are several non-obvious pitfalls along the way. This post covers the full setup, including the debugging steps that actually taught me what was going wrong.</p> <h2 id="architecture" class="relative group">Architecture <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100"><a class="group-hover:text-primary-300 dark:group-hover:text-neutral-700" style="text-decoration-line: none !important;" href="#architecture" aria-label="Kotva">#</a></span></h2><pre tabindex="0"><code>Android │ mDNS discovery (_ipps._tcp) ▼ Avahi (advertises printserver.local:631) │ nginx (port 631, TLS terminated, cert trusted by Android) │ CUPS (localhost:6310) │ Brother printer (USB) </code></pre><p>nginx sits between Android and CUPS to handle TLS properly. Android&rsquo;s Mopria print service requires a trusted HTTPS connection for automatic discovery to work.</p>