As part of reviewing the backends for necessary dependencies in a snap package, there are a couple there that I would like more information about.
sxbackend looks like it was once related to http://www.skylable.com, but this site now seems dead.
hsibackend uses the "hsi" command, which I cannot find in any package in Ubuntu or anywhere else. The best guess I have is https://www.hsicloud.com/ -- is this correct? Where does the "hsi" command come from?