How to interpret and resolve unsatisfied dependencies?

RE: How to interpret and resolve unsatisfied dependencies?

Didrik Rokhaug — Tue, 05 Jul 2022 09:10:09 GMT

We don't have any small and simple samples showing how to use DTLS, unfortunately.

The lwm2m_client sample uses DTLS, but I don't think it is a good starting point unless you want to use LwM2M.

So the simplest sample to use as a baseline is probably the https_client. It shows how to send a HTTP request over the socket API, with TLS for server authentication. However, the procedure for writing the credentials to the modem is the same, you just write a PSK instead of a CA certificate. Similarly, the way you open the socket is the same, just open a DTLS socket instead (SOCK_DGRAM instead of SOCK_STREAM, IPPROTO_DTLS_1_2 instead of IPPROTO_TLS_1_2).

RE: How to interpret and resolve unsatisfied dependencies?

Ron Segal — Mon, 04 Jul 2022 23:34:29 GMT

Hi Didrik

Thanks for your reply. Darn, I wasn't aware of this modem core capability. Are you able to provide a reference for enabling and configuring this functionality, setting the PSK etc?

RE: How to interpret and resolve unsatisfied dependencies?

Didrik Rokhaug — Mon, 04 Jul 2022 12:06:56 GMT

Hi,

The modem supports DTLS with PSK, so there is no need for running the DTLS stack on the application core.

When using the offloaded (to the modem) stacks, simply opening a DTLS socket should be enough.

Best regards,

Didrik