low power establishment

RE: low power establishment

Mttrinh — Mon, 01 Feb 2021 14:38:40 GMT

Hi,

The MESH_FRIENDSHIP_RSSI_FACTOR is the weight factor applied to the received RSSI by the Friend node. Available factors are 1.0, 1.5, 2.0, and 2.5. The lower the factor, the less a low received RSSI increases the delay of the Friend Offer. MESH_FRIENDSHIP_RSSI_FACTOR_2_0 just means that the weight factor is 2.

RE: low power establishment

jowei — Thu, 28 Jan 2021 05:21:28 GMT

Hi Mittinh

Could you explain more detail about MESH_FRIENDSHIP_RSSI_FACTOR_2_0 and MESH_FRIENDSHIP_RSSI_FACTOR_2_0 ?

My scenario is, there will only one friend candidate, and some LPN(let's using only one LPN as here example)

But Friend candidate will be in a long distant to the other one LPN(but they are still within RF range), so will MESH_FRIENDSHIP_RSSI_FACTOR and MESH_FRIENDSHIP_RSSI_FACTOR affect LPN get the friend offer?

Thanks

RE: low power establishment

Mttrinh — Thu, 21 Jan 2021 11:34:35 GMT

Hi,

Friend offer scanning time(1 second) is set via public API(look at "mesh_lpn_friend_request" descripstion). 100 milliseconds are hardcoded in definition "MESH_LPN_FRIEND_REQUEST_TIMEOUT_MIN_MS". It is possible to change both of these values. However, it might break this:

If no acceptable Friend Offer message is received, the node may send a new Friend Request
message. The time interval between two consecutive Friend Request messages shall be
greater than 1.1 seconds.

That might not be acceptable for some Friend implementations.

Just be aware that the 1 second is possible to change and we provide the ability to do this. The 100ms is also possible but you need to understand what and how.

RE: low power establishment

jowei — Tue, 19 Jan 2021 02:29:29 GMT

Hi Nordic:

Besides question1 above, we'd also like to ask how to modify "100ms" of "After 100 millisesconds........."?

Thank you