MarsSeed [1] filed a deletion request for ros-noetic-mav-msgs [2]: Fails to build. This is upstream's last release, from 2018. [a] Not maintained since 2022 [b], and even the last revision is unbuildable on Arch.
[a]: http://github.com/ethz-asl/mav_comm/tags [b]: http://github.com/ethz-asl/mav_comm/commits/master/mav_msgs [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/ros-noetic-mav-msgs/
