# dtls_echo

This example  shows you how to use TinyDTLS with the non-socket approach.

This code  is based on  ../gnrc_networking and ../gnrc_tftp.
Is a good idea to read their README.md's for any doubt of how making the
testings.

## SOCKET vs. Non-socket (GNRC)

This example is configured to use the GNRC instead of  sockets (over GNRC).
At the moment, the configuration must be done manually in the Makefile of
this project.

## Fast configuration (Between RIOT instances):

Preparing the logical interfaces:

    ./../../dist/tools/tapsetup/tapsetup --create 2

For the server instance:

    make all; PORT=tap1 make term
    dtlss start
    ifconfig

Do not forget to copy the IPv6 addresses!

For the client:

    PORT=tap0 make term
    dtlsc <IPv6's server address> "DATA TO DATA TO DATA!"

# Testings
## Boards

Those boards that do not support  the `../gnrc_networking` example are included
in the `BOARD_INSUFFICIENT_MEMORY`, plus the  board `cc2650stk`.

There are certain boards that are having issues with `crypto.c` and
`dtls_time.h` Which for now are in the the `BOARD_BLACKLIST`.

The boards that requires `periph_conf.h` are not tested.

Boards with problem type 1 (`crypto.c`):
    z1
    wsn430-v1_4
    wsn430-v1_3b
    waspmote-pro
    msb-430h
    msb-430
    chronos
    arduino-mega2560

Boards with problem type 2 (`dtls_time.h`):
    cc2538dk
    msbiot
    telosb

Boards with problem type 3 (Redifinition):
    saml21-xpro
    samr21-xpro
    arduino-uno
    arduino-duemilanove

NOTE: Those on type 1 can be benefit of the following PR:
https://github.com/RIOT-OS/RIOT/issues/2360
However, there are still issues to fix.

NOTE: Those on type 2 can be fixed with the patch at
https://github.com/RIOT-OS/RIOT/pull/5974

## FIT-LAB

The code has been tested in the FIT-LAB with M3 motes.
However, erros can occurrs. Enabling the line `CFLAGS += -DNDEBUG` in
the `Makefile` reduces the risk.