Event script: last group address tag

[Domoticatorino]

Dear all,
I am doing an event script by tag assigned to 1 byte object.

Hence

object = grp.tag('cdz mode') -- cdc mode is tag of 1 byte group address

with Log(object) I can see the tables of all group address with 'cdz mode'.

I would like to take in consideration only the last group address with 'cdc mode' tag which start the script event.

How can do that?

Thanks.