bt_mesh_model_send relayable?

[Shahin97]

Hello, 

I am looking into relay nodes and my nodes do not seem to relay,

All nodes are provisioned with the same provisioner and have the same keys 

The following configs are enabled - 

CONFIG_BT_MESH_RELAY=y
CONFIG_BT_MESH_RELAY_ENABLED=y
CONFIG_BT_MESH_RELAY_RETRANSMIT_COUNT=5


The messages that are sent are vendor model messages using:

bt_mesh_model_send sent to BT_MESH_ADDR_ALL_NODES. 

bt_mesh_model_send does not have any acknowledgement, am I correct in saying bt_mesh_model_send cannot be relayed? and if not any pointers what to look for in this issue

[AHaug]

Hi,

I've picked up your case and will be looking into this early next week. In the meanwhile, do you got access to the Mesh specification? And which version of NCS are you using (it is relevant w.r.t what version of the Mesh spec you're using)?

Kind regards,
Andreas

[Shahin97]

Here is my test process that may aid in finding the issue:

1 - Flash Unit A & B with the same project

2 - Bind Keys to both A&B for VND models

3 - A sends a message X address, B should relay

Code to send Vendor message: 

Node: the code below works, no issues with BT_MESH_ADDR_ALL_NODES, however no relays

struct bt_mesh_model *mod = vnd_mod_pub_ctx.mod;

    struct bt_mesh_msg_ctx ctx = {
            .addr = sendAddr,
            .app_idx = mod->keys[0],
            .send_ttl = BT_MESH_TTL_DEFAULT,
    };

    BT_MESH_MODEL_BUF_DEFINE(buf, opcode, len);
    bt_mesh_model_msg_init(&buf, opcode);

    net_buf_simple_add_mem(&buf, bufferIn, len);
    net_buf_simple_add(&buf, '\0');

    return bt_mesh_model_send(mod, &ctx, &buf, &bmns_vnd_model_cb, NULL);

struct bt_mesh_model_pub vnd_mod_pub_ctx;

static struct bt_mesh_model bmns_vendor_models[] = {
        BT_MESH_MODEL_VND_CB(CONFIG_BMNS_COMPANY_ID,
                             BMNS_VND_MODEL_SRV_OPCODE,
                             opcode_list,
                             &vnd_mod_pub_ctx,
                             NULL,
                             NULL)
};

build output configs (set in prj.conf, this snippet is to show they are actually set)

GEN_ABSOLUTE_SYM_KCONFIG(CONFIG_BT_MESH_RELAY, 1);
GEN_ABSOLUTE_SYM_KCONFIG(CONFIG_BT_MESH_RELAY_ENABLED, 1);

from the nRF mesh app, relay is enabled, retransmission count is 
"5 retransmits and total transmissions: 6"

retransmission interval 20ms

Note: 

Sending it to All Nodes, All relays, or to node B, is received by node B, and not relayed on.
Sending it to a different address, is not received by node B

[Shahin97]

Update: I have tried with my dev kits with the light switch/ light example and that relays. Tested through distance. 

However I did not see any relay logs - 

These configs are enabled - 
CONFIG_BT_MESH_LOG_LEVEL_DBG=y
CONFIG_BT_MESH_ACCESS_LOG_LEVEL_DBG=y

Are there any relay log configs?