D14: libmosquitto from Debian, shipped in the package (Qt MQTT needs the exact Qt version; nothing on the Frame). D15: own device-based discovery layer on Qt's JSON classes. Document the libraries per requirement and what the Frame provides (Qt modules, OpenSSL 3.2.1, glibc 2.39). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>