From HFML-FELIX Wiki
RCUFFD is an instance of a multiplexing reverse proxy server, used to control RCUFF systems from both the FELIX and FELICE controlroom pc's. It runs on rcuff-sandbox. It can be monitored, and started/stopped from the monit interface.
For more information see README on GitLab repo
/etc/monit/conf.d/rcuffd
check process rcuffd with pidfile /var/run/rcuffd.pid
start program = "/usr/bin/rcuffd.sh start"
stop program = "/usr/bin/rcuffd.sh stop"