LWM2M: Support for DTLS with Raw Public Key security mode [v3]

[bsmelo]

Main changes since v2 (#2298)

• Minor memory leaking fixes
• Removed the "Ugly" patch for CoAP timeout. The timeout issue (which generates duplicated packets) seems to happen only in Client-Server/BSServer communication between the samples, and not in the same communication when it's done inside the test-lwm2m.c program. I guess it has something to do with the fact that the samples are running in different processes (since that's the only difference between samples and tests), but I still don't know what/where exactly is the issue.

Signed-off-by: Bruno Melo bsilva.melo@gmail.com

[cabelitos]

@bsmelo In my machine the RPK is working perfectly without the necesseity to increase the timeout. Maybe is something related to your machine? Well, I'll merge this series. Looks good as is.

[cabelitos]

Merged!