Sidewalk uplink/downlink reliability

[Viet Nguyen]

Hi,

We are developing and testing sidewalk application for our next pre-production stage.

Settings:

-  NRF52840 

- Sidewalk sdk 1.4.4

- NCS 2.4.0

- Lora ( CSS) mode.

Question:

- In production application, do we need to periodly sending a packet (like keep-alive) to receive an downlink message from cloud ( irregular message)? (similar class A of LoraWAN?)

Because we tested and found that if not having the keep-alive message, sometimes, the downlink from cloud was missed ( on cloud, the delivered notification was not fired).

And in "Sensor monitoring" example, there are some periodly uplinks, is that for having reliable downlink.?

But on template_subghz, we found that there are 2 profiles for configuration ( light vs fast) (sensor monitoring example does not have this configuration). Light profile is for low power case, fast profile is not. But does fast profile help for reliability of downlink packet? 

Any other configurations that SDK support for fast uplink, and reliable downlink ( our production is not battery-device)? Pls share with us.

We need to figure out this because if keep sending keep-alive uplink will cost much on AWS service.

Thank you.

[Menon]

Hello,

I have asked this internally to the sidewalk development team, and I will get back to you as soon as I get a response from them.

Kind Regards,

Abhijith

[Menon]

Hello,

I heard from the team recently. They told me it is better to seek advice from Amazon regarding the production applications. Amazon has a deeper understanding of the protocol and can also provide future-proof advice, as well as some exclusions. You can refer to the Sub-GHz protocol section under the sidewalk specifications (Chapter 5, page No. 75).

For testing the sub-GHz profiles, you can try the Device under Test sample. You can use the command "options" for profile parameters and find the best option for you.

Kind Regards,

Abhijith

[Viet Nguyen]

Thanks alot, Menon, we are asking Amazon as your suggestion.