Using KMU for PSK in Lwm2m client

[Tom Weber]

Hello!

I have stored a PSK in the KMU of my nRF54L15, and now want to use it for a Lwm2m client DTLS connection.

According to Zephyr's documentation, the PSK must be provided in the clear on resource 5 in the Security object.

Is there any way to pass a psa_key_id_t instead? I don't want the PSK exposed to the CPU.

If there is no support currently, are there any plans to add it?

[Einar Thorsrud]

Hi

You are right that there is no support for PSK from the KMU in the Lwm2m client with the Zephyr Lwm2m client, and supporting it does not seem straigt-forward. I cannot comment on roadmap questions and potential future features though, but you can contac your Nordic sales representative regarding that.

Br,

Einar

[Tom Weber]

Thank you Einar.

I will check how feasible it is to add this functionality to MbedTLS.