Sending messages to unicast addresses

[jonappleseed]

In the latest Mesh SDK, nodes are subscribed to a GROUP address. In previous versions - 2.0.0 I believe - you could also send to a predetermined node.

I am trying to figure out how to send a message to any one node via its unicast address. I have created a CLIENT in node_setup.c for this:

case NODE_SETUP_CONFIG_PUBLICATION_ONOFF_CLIENT2:
        {
            config_publication_state_t pubstate = {0};
            client_pub_state_set(&pubstate, 
                                 m_current_node_addr + ELEMENT_IDX_ONOFF_CLIENT2,
                                 UNPROV_START_ADDRESS + CLIENT_MODEL_INSTANCE_COUNT + ELEMENT_IDX_ONOFF_CLIENT1);
            status = config_client_model_publication_set(&pubstate);

            static const access_status_t exp_status[] = {ACCESS_STATUS_SUCCESS};
            expected_status_set(CONFIG_OPCODE_MODEL_PUBLICATION_STATUS, ARRAY_SIZE(exp_status), exp_status);
            break;
        }

However, how do I (a) get the address of a node to send to it and (b) send to it.

Ultimately, I want to be able to configure one of the button presses to send a message to each server one by one.

[Bjørn Kvaale]

You can easily do this using the nRF Mesh smartphone app. The procedure is similar to the Youtube video shown here. What you will need to do is have one standard light switch client & one standard light switch server board. I tested with the mesh sdk v3.1.0. Then, provision both boards. On the client board in nRF Mesh, add the application key (under appkey binding, choose the first one) &  set the publication address of the first generic on off client model to be the unicast address of the server board. If you click on the server board in nRF Mesh, you can see that the generic on off server is under element 0 with a unicast address (e.g. element 0. UNICAST: 0004). On the server board, you need to bind the same appkey to the generic on off server model. This way, both nodes will be able to communicate with each other over the access layer in the mesh sdk. Then, when you press button 1 & 2 on the client board, you will send an acknowledged set message to turn the server board either on or off. The procedure should be similar if you want to add multiple server boards.

[jonappleseed]

Thanks, but I would like to do this without the app. I have a version of the very old SDK (alpha) in which the client could send to any individual board because m_clients was an array of the individual boards. In the new SDK however, there are only two models - one to send to even the other to odd. I would like to use one of the models for unicast sending but I cannot figure out how to.