How to generate a short (1 second) negative pulse

[PBdA]

Hello,
I have a zwave relay (Qubino ZMNHND1 Flush 1D relay) which commands an alarm. The relay is normally closed and to arm or disarm alarm, it should open for a short time and then close. I have tried a lua script:

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commandArray[1] = {['Alarm command'] = 'Off'}
commandArray[2] = {['Alarm command'] = 'On AFTER 1'}

but it does nothing. This works only for a pulse >= 3 seconds:

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commandArray[1] = {['Alarm command'] = 'Off'}
commandArray[2] = {['Alarm command'] = 'On AFTER 3'}

It's possible to generate a short positive pulse with a scene:

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Command: On
On delay: 0
Off delay: 1

But it doesn't work for an Off command:

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Command: Off
On delay: 1
Off delay: 0

Switch goes Off immediately but never return to on.

[jautem]

can you use sleep function in lua script , turn off , sleep 3 et turn back on ?

[PBdA]

can you use sleep function in lua script , turn off , sleep 3 et turn back on ?

Sleep is a bad thing in lua script because it blocks execution of other scripts. Furthermore, I think it doesn't work because commandArray is executed at once when script return.

[jautem]

so perhaps fork another script like shell in lua source script , and shell script will sleep and use api to finish job ?

[PBdA]

Nice idea but I have taken another way: Qubino ZMNHND1 Flush 1D relay can be configured to return to On by itself with a configurable delay. I had to use a recent OpenZwave config but it works.
Thank you for your help.