Teltonika FMC003 Alarm event

I've got the Teltonika FMC003 and am missing alarm events on unplug in the UI.

According to the sources L288 the FMB series is supported but FMC is missing, is this correct?

Does this mean a computed attributed would not work, or could this help my case?

Thanks for clarifying

Computed attributes should work.

Thanks a lot, I'll try that first