Those commands listed are from the Aeon Labs Multifunction Siren device handler, not the home energy monitor.
If you’re using that DH for the aeon siren, or my other device handlers for the Aeon Labs Doorbell or GoControl Siren, instead of having to specify the parameters individually, it’s a lot easier if you just select the device as a music player and use the Speak Text command.
Setting up custom commands in Rule Machine was a pain and SHM along with most other SmartApps don’t support them so I built this workaround into all my sound related device handlers.
For the aeon labs siren, if you enter delayedAlarm 4, 2, 60, 30 into the speak text field, when the siren gets activated it will wait 30 seconds and then play sound 4 for 60 seconds at volume level 2.
The full list of the aeon siren commands that can be entered this way is located here.