LPN without friend node

RE: LPN without friend node

Joakim Jakobsen — Fri, 26 Apr 2019 10:44:07 GMT

Thanks for letting me know!
Updated my previous answer.

Best regards.

RE: LPN without friend node

aaronxu — Fri, 26 Apr 2019 08:28:05 GMT

Hi,

Your documentation has moved? could you kindly update that link?

RE: LPN without friend node

Gerry — Fri, 12 Apr 2019 09:44:41 GMT

No, I count, when I get out of sd_app_event_wait(). Happens about once a second. After 10 sec. I switch off, after 20 sec. on again for the test.

RE: LPN without friend node

Joakim Jakobsen — Thu, 11 Apr 2019 14:01:05 GMT

Hi.

Got a tip from one of my colleagues. He suggested that you might be able to solve this by having your node advertise as a regular BLE-beacon and having some nodes in the mesh network listening for the beacon advertisment.

You can take a look at the Enocean example in our nRF5 SDK for Mesh, which does something like this.

EDIT: Updated documentation link:
https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.meshsdk.v3.1.0/md_examples_enocean_switch_README.html?cp=5_1_3_1

Best regards,
Joakim Jakobsen.

RE: LPN without friend node

Jackes5 — Wed, 10 Apr 2019 15:19:18 GMT

How? Are you using nrf_delay(ms); for that?

RE: LPN without friend node

Gerry — Wed, 10 Apr 2019 08:11:32 GMT

So far, I only tried to do so in the main loop. Do you think it makes a difference, when I do it in a timer interrupt?

RE: LPN without friend node

Jackes5 — Tue, 09 Apr 2019 14:57:36 GMT

Can you start radio for communication and disable it again later? By using a timer I think you can, after provisioning, stop the radio until it's needed again (the 5 seconds), all that in the one minute cycle you need.

RE: LPN without friend node

Gerry — Tue, 09 Apr 2019 09:39:09 GMT

I'm testing with scanner_radio_start(), scanner_radio_stop() and nrf_mesh_enable(), nrf_mesh_disable().

The current comes down to some uA but it doesn't really work. (provisioning works fine, communication doesn't)

RE: LPN without friend node

Jackes5 — Mon, 08 Apr 2019 13:48:57 GMT

That function (void)sd_app_evt_wait(); is already in a for(;;) inside the main in the examples. I'm also looking for things to disable the radio and enable it later easily... So far what I do is to reduce the power the radio uses with this function: sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_ADV, BLE_CONN_HANDLE_INVALID, -48); when processing the packages and then increase it to communicate to other devices.

In my case, deep sleep (sd_power_system_off) can be used because it has to wake up by user input (a button).

RE: LPN without friend node

Gerry — Sun, 07 Apr 2019 20:43:32 GMT

Hi, thanks for your answer. I think I have to clarify my quesion a bit

I would like to use the sd_app_event_wait() function to bring the device into System_On low power mode. In my case, the radio (RX and TX) should be turned off to not get Mesh-events during sleep and only RTC0 should be running.

Could you please give me some lines of code, how this can be achieved?

Best regards

Gerry

RE: LPN without friend node

Jackes5 — Fri, 05 Apr 2019 19:50:56 GMT

[quote userid="67410" url="~/f/nordic-q-a/45712/lpn-without-friend-node"]The sensor should wake up once every minute, send a message to the client, stay up for 5 sec. and then sleep again.[/quote]

Hello, as far as I know, the client is the one to send messages to the server.

What you want to do is achievable by setting the timeout of the messages from the client to the server less thant the timeout for sleep. I think it can't be deep sleep, because it needs an external interrupt to wake-up, so there may be a limitation there.

1. You'd have to define a timer in the node (I'm pretty sure it has to be a client node, but I might be wrong) to make it "sleep" when it expires by using a callback. Check out the files simple_hal.c and .h, they have an example of a timer to control the blink of the lights in the light switch example. Consider that "sd_app_event_wait function will put the device to System On low power node" by default. Although more power modes are described here, I'd use SYSTEM_ON because of the use of a timer as wake up.

2. About this question, I'm checking out on this paper Bluetooth Mesh Energy Consumption: A Model, where they created a LPN model without a friend node.