RE: nRF Mesh Reply Attack Problem

Amanda Hsieh — Tue, 05 Mar 2024 17:52:41 GMT

Hi,

Sorry for the delay. It took time for your answers.

Regarding the first question: I can't seem to reproduce their problem using the supplied config file. Is this the config you use on both ends? I tried resetting both the sender and receiver (both using the config supplied) several times (including resetting after the message sending but before RPL was stored in settings), but RPL functionality worked as expected. If you use a different config or firmware on one of the sides, this would be interesting to know. As of now, I can't reproduce this issue with the information I have.

[quote user=""]My most vexing issue is even with 0 hops sending 240 bytes payload in a single send, I am facing a delay of 2 seconds[/quote]

The two seconds taken is expected with the default network transmit configuration.

The default number of time each Network PDU is sent: 3, configured by CONFIG_BT_MESH_NETWORK_TRANSMIT_COUNT. Its default value is 2, meaning each segment is transmitted 3 times.

The default interval between network PDUs (CONFIG_BT_MESH_NETWORK_TRANSMIT_INTERVAL) : 20 (ms)

Time spent sending each Network PDU: 60ms + advertisement delays

At the Lower Transport Layer, it will be broken into 20 Lower Transport PDUs (240/12=20, segment buffer is 12 bytes long)

Time spent sending 20 PDUs: 60ms * 20 PDUs + advertisement delays == 1200ms + advertisement delays

With the default configuration, around 1,5 or so seconds (with no packet loss) is expected. To decrease this time, the easiest is to lower the network transmit count or the network transmit interval, keeping in mind the tradeoffs (lower transmit count could make things less reliable, and lower interval could cause more collisions)

Regards,
Amanda H.

RE: nRF Mesh Reply Attack Problem

Rajeev K R — Mon, 04 Mar 2024 05:49:13 GMT

Hi, Amanda Hsieh

Please let me know if are there any solution to this

RE: nRF Mesh Reply Attack Problem

Rajeev K R — Thu, 29 Feb 2024 14:45:49 GMT

I am using ncs version 2.4.2

RE: nRF Mesh Reply Attack Problem

Amanda Hsieh — Thu, 29 Feb 2024 14:03:26 GMT

Hi,

Which NCS version are you using?

Regards,
Amanda H.