How does the mesh message go if a node public message to the address of itself?

[ShawnL]

Hi,

for example:

uint16_t addr = bt_mesh_primary_addr();

struct bt_mesh_msg_ctx ctx = {

                    .addr = addr;

                };

...

bt_mesh_lightness_cli_light_set_unack

will this message over the air or be handled by itself not over the air?

 

Thank you in advance.

Best regards,

Shawn

[tesc]

Hi,

The network layer will neither transmit nor relay messages that are addressed to a unicast address on the node itself. This includes messages originating on the same node, and it also holds for messages over the GATT bearer; messages will not be relayed if they are addressed to elements on the node itself.

Regards,
Terje

[ShawnL]

OK, got it, the messages that are addressed to a unicast address on the node itself will not be sent to the air.

But the messages that are addressed to a unicast address on the other node(target node) will be sent to the air and will be relayed by the other nodes(relay nodes) in the same mesh network, am I right?

[Omkar Kulkarni]

Yes. It is implemented exactly as per specification. See: https://www.bluetooth.com/specifications/specs/html/?src=MshPRT_v1.1/out/en/index-en.html#UUID-e526affc-e131-135e-36bf-12c41f9ddff8 

[tesc]

Hi,

ShawnL said:

But the messages that are addressed to a unicast address on the other node(target node) will be sent to the air and will be relayed by the other nodes(relay nodes) in the same mesh network, am I right?

For the most part, yes.

There are other messages which could be held back, namely messages for connected GATT devices (if the node is a GATT proxy), and messages for LPNs in a current friendship (if the node is a Friend node). Such messages are delivered over GATT bearer in a connection event (for GATT proxy), or over ADV bearer in a poll event (for Friend).

For relays, those will also time out if TTL gets exhausted.

Apart from that, messages would be sent over-the-air.

Regards,
Terje

[ShawnL]

Very clear.
Thank you.