questions about mesh message publication

hi support team,

i have customer is developping mesh.

customer is trying to sniffer the message when i pressed the buttoon on demo mesh_light.

i have two questions on mesh.

 i set publication retransmission time for 0, and here is the sniffer log:

my question is

1.why mac address is changing, is there  any document about this?

2.how to set the default retrasmission , if customer want to set this to 4 or 5

Regards,

William.

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