Optimizing LWM2M sample to use PSM

I need help extending the LWM2M sample to use PSM to optimize the power consumption of LWM2M.

Scenario:

1. Enable PSM on the LWM2M sample.

2. Set the Lifetime of the LWM2M connection to slightly longer than the PSM sleep cycle

3. Trigger the LWM2M update on the pre-wake LTE event so that we send the update when the PSM timer wakes up.

4. Hold all notifications for the PSM wake periods so we are only transmitting during the wake cycles.

For a first step, we can change the PSM settings at compile time, but we would like to be able to use LWM2M object 10 as well (version 1.1 as PSM settings).

0 user93921 over 4 years ago

Hi James,

The current nRF9160: LwM2M Client — nRF Connect SDK 1.9.1 documentation (nordicsemi.com) sample does not support LWM2m object 10, but I think you can easily add your own implementation by referring to other objects.

I also want to share some good news with you. We are going to add LwM2M v1.1 support on the Assert Tracker v2 application in the coming NCS 2.0.0 release. I think it would be a great reference for your development. Happy work!

Best regards,

Charlie
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0 user115417 over 4 years ago in reply to user93921

Thank you, I am happy to test any early versions you may have, especially the 1.1 content.

Features I would like to see in the 1.1 implementation:

1. Use "send" to send a composite notification with sensor values in a single packet without the need for an observe.

2. idle/active behavior so if the device is not moving it sends data at a slower rate than if it is moving.

Thanks,

Jim
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0 user93921 over 4 years ago

Hi Jim,

I am a bit confused about your comments.

If you are talking about nRF9160: Asset Tracker v2 — nRF Connect SDK 1.9.99 documentation (nordicsemi.com) features, your request seems already been satisfied.

1) The device sends all data from the requested data list in one JSON file. Data is also batched to reduce the number of messages transmitted and to be able to retain collected data while the device is offline.

2) The device has two modes Active and Passive to sample data at different rates. You can modify the codes to switch between them according to your expected moving state threshold.

If you are talking about the LwM2M v1.1 standard, this is already fixed, and you may need to contact the OMA SpecWorks – For a Connected World. The features you mentioned are also more application-level features instead of the LwM2M protocol.

Best regards,

Charlie
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