Another approach that scales even better: EventTrigger.
I just set the channel and nothing else.
I connect the copied Notif command to the DrvHttpNotif device.
After changing the channel, an event appears, and in the ACM log I see:
2025-12-04 21:57:45 Send command. Device 200, command Notif
Unfortunately, nothing happens, silence in the DrvHttpNotif device log.
Any idea?