DTLS and carrier library

[Lorenzo Amicucci]

Hi, 

if I enable Carrier library on nRF9160, how many modem DTLS socket remain available for the Application?

Thanks

Lorenzo

[Didrik Rokhaug]

Hi,

The modem uses both the DTLS sockets available, so there are no left for the application.

"The LwM2M carrier library uses both the DTLS sessions made available through the modem. Therefore, the application cannot run any DTLS sessions."

https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.8.0/nrf/libraries/bin/lwm2m_carrier/requirements.html#requirements-and-application-limitations

Best regards,

Didrik

[Lorenzo Amicucci]

ok, thanks. 
So, If I am using carrier library (for carrier certification) then I have to use mbed TLS for the DTLS in my application. Correct?

Thanks

BR
LA

[Didrik Rokhaug]

Yes.

Or, you must find a way to make do without DTLS, e.g. just UDP or TLS/TCP.

Though, I don't know how well Zephyr handles some socket using offloaded DTLS and some using native DTLS.

[Lorenzo Amicucci]

Thanks! 
One question

Didrik Rokhaug said:

offloaded DTLS

Can you please check how to offload? or point to the code that allow to have some DTLS socket in the modem and some native in mbedTLS?

Thanks

LA

[Lorenzo Amicucci]

beside this, how many modem TLS socket are left, if the carrier library takes both modem DTLS?

Thanks