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doc: Add release notes about LwM2M updates
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DTLS + Tickless

Signed-off-by: Seppo Takalo <seppo.takalo@nordicsemi.no>
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SeppoTakalo authored and rlubos committed Aug 3, 2023
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Expand Up @@ -347,6 +347,18 @@ Cellular samples (renamed from nRF9160 samples)

* The sample to use the :ref:`lib_nrf_cloud` library function :c:func:`nrf_cloud_obj_pgps_request_create` to create a P-GPS request.

* :ref:`lwm2m_client` sample:

* Added:

* An overlay for using DTLS Connection Identifier.
This significantly reduces the DTLS handshake overhead when doing the LwM2M Update operation.

* Updated:

* The sample now uses tickless operating mode from Zephyr's LwM2M engine which does not cause device wake-up in 500 ms interval anymore.
This allows the device to achieve 2 uA of current usage while in PSM sleep mode.

Trusted Firmware-M (TF-M) samples
---------------------------------

Expand Down Expand Up @@ -555,6 +567,10 @@ Libraries for networking
* Support for using pre-provisioned X.509 certificates.
* Support for using DTLS Connection Identifier

* Updated:

* Zephyr's LwM2M Connectivity Monitor object now uses a 16-bit value for radio signal strength so it does not roll over on values smaller than -126 dBm.

* :ref:`lib_aws_fota` library:

* Updated:
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