I want to dynamically change on_event_start value while the motion service is running. Is there a way to reload the motion.conf file without restarting the service?
Based on the following page, Motion Guide - Getting It Running: Signals (sent with e.g. kill command)
It would appear that you can send the following command;
kill -s SIGHUP pid
where pid is the pid of the motion instance you wish to update with the new config. This will refresh/reload the config to the running motion instance.