A DBus system service that allows to access /dev/input/* devices
to toggle capslock and perform other keyboard related actions. This is
required when running under Wayland, but also used with X11.
See https://0pointer.net/blog/the-new-sd-bus-api-of-systemd.html, https://stackoverflow.com/a/44281937, https://github.com/chiehmin/gdbus_test/blob/master/server.c, https://aleksander.es/data/GNOMEASIA2014%20-%20Introduction%20to%20DBus.pdf.
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If we need to limit access to the interface to only Keyman, we can use polkit which allows to add a rule with an action that checks for the program.
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to see the log file
journalctl -f -u systemd-keyman
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to monitor method calls
sudo busctl monitor com.keyman.SystemService1