Firmware updates for OPNsense and pfSense with fwupd/LVFS

" summary

Describes a proof-of-concept integration of the fwupd/LVFS firmware-update framework with the BSD-based firewall/router systems OPNsense and pfSense, focusing on challenges of implementing firmware update support on those platforms. Covers basic fwupd/LVFS concepts and argues for keeping router firmware (microcode, fixes) up to date because routers are common attack vectors and pfSense/OPNsense currently lack built-in firmware update methods.

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