LPN polling period

RE: LPN polling period

Joakim Jakobsen — Fri, 14 Jun 2019 15:58:23 GMT

Hi.

You can use the mesh_lpn_poll_interval_set() function to set the poll interval.
The poll interval is the interval between two separate Friend Poll actions. This is the interval between each time the node wakes up to empty the Friend Queue. The interval must be set in a way that the LPN is able to complete as many retry attempts as possible before the poll timeout expires. This means that it must satisfy the following equation:

poll_interval_ms < (mesh_lpn_friend_request_t.poll_timeout_ms -
                    (mesh_lpn_friend_request_t.receive_delay_ms +
                     nrf_mesh_evt_lpn_friend_offer_t.offer.receive_window_ms) * (MESH_LPN_POLL_RETRY_COUNT + 1))

Note that a low poll_timeout_ms and long receive_delay_ms and receive_window_ms can make it impossible to reach the MESH_LPN_POLL_RETRY_COUNT.

Best regards,
Joakim

RE: LPN polling period

Sameer — Mon, 10 Jun 2019 06:29:45 GMT

Hi Joakim,

The poll_interval_ms comes to 7870ms from below equation with mentioned values of all the parameters.

[quote userid="74384" url="~/f/nordic-q-a/48196/lpn-polling-period"]m_lpn.poll_interval_ms = m_lpn.poll_timeout_ms -
(m_lpn.receive_delay_ms + m_lpn.receive_window_ms) * (MESH_LPN_POLL_RETRY_COUNT + 1);[/quote]

Regards,

Sameer

RE: LPN polling period

Joakim Jakobsen — Fri, 07 Jun 2019 10:12:00 GMT

Hi!

[quote user=""]Hence, the poll_interval_ms comes to 7870 ms.[/quote]

How did you get to this number?

I'll talk to one of the guys at our Mesh team to get some more information about this. I'll get back to you as soon as possible.

Best regards,
Joakim