What is the difference between subnet and group in BLE mesh?

RE: What is the difference between subnet and group in BLE mesh?

Hung Bui — Wed, 11 Jul 2018 15:39:21 GMT

Your understanding is correct. And any node that belong to multiple subnets would also need to remember all the netkeys of each network.

RE: What is the difference between subnet and group in BLE mesh?

Milan — Wed, 11 Jul 2018 13:42:18 GMT

Hi Hung Bui,

Thanks for the reply.

I tried to understand in more depth after posting this query.

What I understood is in a network there could be multiple subnets (separated by NetKey) and subnets may have multiple groups using group addresses.

Also, I understood that a node acting as a gateway device having multiple subnets in a mesh network need to remember NetKey to pass the message to that particular subnet.

Please confirm my understanding.

RE: What is the difference between subnet and group in BLE mesh?

Hung Bui — Wed, 11 Jul 2018 13:36:56 GMT

Hi Milan,

Could you clarify what you mean by "group" ?

There isn't a definition of group in mesh spec as far as I know.

Are you thinking of "group address" ? Group address is just the address that multiple nodes can subscribe and publish to.

The subnet is a group of nodes that share the same subnet (network) key.