On Synology I can Syncthing manually start, stop, restart with the synoservicecfg command. E,g, start with
synoservicecfg --start pkgctl-syncthing.net
If I try to start --reset-deltas in that way
synoservicecfg --start pkgctl-syncthing.net --reset-deltas
it doesnt run. What is wrong?