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Subscribe a group address for the Mesh Message

Currently, I am working with the Nordic SimpleOnOff Model of the Light switch in the Bluetooth Mesh.

I am good that the light in the mesh can be set on/off after Provisioned.

Now, i would like to divide the Board into 2 Groups, let's said Group A and Group B.

But i am not very sure how to work with that?

How can i drive a specify device to bind to a specific Group Address? I believe that i should subscribe to some service, but any sample code or pointer that can show how can I subscribe the service for that "group"?

After that, how should i send the message to "This Group" of light for On/Off.

I tried to study the code of access_model_publish, from the Mesh SDK, but seems it did not have a way to specify the Group address for boardcast.

And how about the Receiver? Should i define another set of OpCode, like SIMPLE_ON_OFF_OPCODE_GROUP_SET to do the operation there?

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