Debug Relay Node Information (source address, destination address ... etc ) in mesh network Nrf connect SDK 2.3.0?

[starkAbhi]

Hi,

i am using nrf connect extension in vs code with Zephyr OS build v3.2.99-ncs2 and Nrf connect SDK 2.3.0. Our Application requirement in which A - B - C are in mesh network. 'A' send information to 'C'  though 'B' because 'A' and 'B' are not in range. when 'A' send information, it will reach to 'B' with information + source address, destination address, rssi ... etc. then 'B' send that data to destination 'C'.

1. How can I debug/log/print data in Relay node side ? and are there any API or function of buffer pointer, buffer length, source address, destination address and rssi ?

2. I need to process the information on middle node 'B' during hopping. and append the data buffer with my custom information. how can i achieve this?

get relay data- stop relay-append relay data-send to another node-

3. Application: i want RSSI between 'A' and 'B' , 'B' and 'C' ? 

4. Node 'A' search around in mesh. collect RSSI and Unicast address of nodes and send that information to node 'C' . Could you please share some example or code snippet?

[Amanda Hsieh]

Hi, 

There is no way to enable only "relay" logs. It can enable network layer logging by configuring CONFIG_BT_MESH_NET_LOG_LEVEL. Currently, an application could not process relayed messages since they don't go above the network layer. 

As for RSSI, please follow my colleague's instructions in this post. 

Regards,
Amanda H.

[starkAbhi]

Hi Amanda H,

In conclusion , Relay messages are not available for user to process during hopping. Above mentioned Post is mine. I asked your colleague for RSSI Monitor server example code.

1. Could you please help me to make RSSI server for Node to scan around to get near by nodes -Address and RSSI . and send the information to gateway?

2.  how relay node work? does it store the message and send to destination?

Actually, I want to measure distance between nodes and anchors. are their any suggestions?

Regards

Abhishek

[starkAbhi]

Hi Amanda H,

in net.c file, on the debug data: i received Relay data in hex:

PDU: 3d07007de04acd5c537877b89e6d189997af

How can i parse the given data to extract sending data? example i used here for mesh:  https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.3.0/zephyr/samples/bluetooth/mesh/README.html

TransportPDU Parsing method?

Regards

Abhishek

[starkAbhi]

Hi Amanda H,

Attaching my requirement flow chart.

Same question as i asked above. just attaching diagram for better understanding.

 

starkAbhi said:

1. How does Node C(Destination) knows Hoping Nodes 's Address?

2. To get know the Address of 1st Relay Node B which is near by Node A (Source) ? 

RSSI: Anchor_1 and Tag

Address: Anchor_1

Gateway = RSSI + Address

Regards

Abhishek

[Amanda Hsieh]

Hi, 

starkAbhi said:

1. How does Node C(Destination) knows Hoping Nodes 's Address?

2. To get know the Address of 1st Relay Node B which is near by Node A (Source) ? 

This is not possible. Since currently Bluetooth mesh uses the broadcast approach, the destination node doesn't know the path the message took from the source address.

starkAbhi said:

How can i parse the given data to extract sending data?

This is done in bt_mesh_net_decode function: https://github.com/nrfconnect/sdk-zephyr/blob/5acaefeafa7a96bd8199a94f520dbdacc7d14160/subsys/bluetooth/mesh/net.c#L836-L850C6

The message is first de-obfuscated using IV Index (see `bt_mesh_net_obfuscate` call in `net_decrypt`) and then decrypted using a network key (see `bt_mesh_net_decrypt`).

-Amanda H.

[starkAbhi]

Hi Amanda H,

Amanda Hsieh said:

This is not possible. Since currently Bluetooth mesh uses the broadcast approach, the destination node doesn't know the path the message took from the source address.

That is disappointing. are their any other way to achieve my Application requirement or Should I drop my idea?

Regards

Abhishek

[Amanda Hsieh]

Unfortunately, it could not achieve the requirement currently.