Multicast messages on LoRa Murata Module (I-CUBE-LRWAN)

Hello, I ask here a question already asked in another topic and which as not received any answer.

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 I would like to know how to

implement Multicast messaging

on my end-node (currently using Murata Module (CMWX1ZZABZ-078) with ST LoRa

libraries (Expansion I-CUBE-LRWAN).

My code is developed from I-CUBE-LRWAN

v1.2.1 and I don't see keys dedicated for multicast in commissioning.h file.

I downloaded the last version v1.3.1 and

I see in the same file :

"Application root key - Used to

derive Multicast keys on 1.0.x devices."

Is there also a device address dedicated

for multicast ?

Do this version fully support multicast messages ?

Regards, Fabrice.