Yes. A toggle every second is 60 a minute, over the flows limit of 30 commands and settings a minute to one device (it can be set anywhere from 1 to 600), and the general command limit is 10 per device per minute. Commands over the limit are refused. I wouldn’t drive a one-second sequence from the cloud anyway. Put the sequence in the device firmware and send one command that starts it, with the duration as a parameter.