With the release of mixer-tools v4.3.0 [1] the swupd-server project is deprecated. All functionality has been re-written into the mixer tool under the mixer build update command. All development done around creating update content consumed by swupd-client is now done in that project.

[1] https://github.com/clearlinux/mixer-tools

The swupd-server package provides a reference implementation of a software update server-side component that generates update content consumable by a software update client (swupd-client). Such content includes manifests that describe incremental changes in the OS from build to build, binary deltas, full copies of files (fullfiles) that were added/changed from a previous build, and packs composed of binary deltas and/or fullfiles.