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.

[jonappleseed]

Hi Bart, any luck on this? I tried using access_model_publish_address_set(), but it takes in a handle not an actual address. From my exploration of the code it appears that handles are determined at the configuration stage by the provisioner. There is also dsm_address_publish_add() which takes in a raw address, but I haven't had any luck with that either.

[bart]

Hey, I haven't actually tried it yet, as i first need to implement functionality before optimizing thing =] Didn't see that it takes a handle. I'd also say you need to call dsm_address_publish_add() for each unicast address then.

[jonappleseed]

Solved! 

static uint32_t set_model_publish_address(uint16_t publish_address, access_model_handle_t model_handle) 
{  
    uint32_t status = NRF_SUCCESS;
    dsm_handle_t publish_address_handle = DSM_HANDLE_INVALID;
    access_model_publish_address_get(model_handle, &publish_address_handle);
    NRF_MESH_ASSERT(dsm_address_publish_remove(publish_address_handle) == NRF_SUCCESS);
    status = dsm_address_publish_add(publish_address, &publish_address_handle); 
    if (status != NRF_SUCCESS) {
        return status;
    } 
    else {
        return access_model_publish_address_set(model_handle, publish_address_handle);
    }
} 

I call this function like so:

set_model_publish_address(UNI_ADDR, m_clients[2].model_handle);

Credit: Hung Bui (https://devzone.nordicsemi.com/f/nordic-q-a/35931/multiple-server-on-one-client---light-switch-demo)