[riot-notifications] [RIOT-OS/RIOT] tests: add nanocoap CLI app for client and server testing (#10640)

Ken Bannister notifications at github.com
Tue Jan 8 11:44:21 CET 2019

The root problem is a bug that a (nano|g)coap client does not recognize when they receive a message with a critical option that they do not understand. RFC 7252, sec. 5.4.1 says that a client in this case must silently ignore the ACK. So, a fix would be for nanocoap_request() to return some error value. I will file a bug. There is an equivalent issue with server request handling.

On the brighter side, I am just about to post an issue and a PR that starts to add client side Block handling. See the [wiki page]([issue](https://github.com/kb2ma/RIOT/wiki/Completing-CoAP-block)).

I don't think this bug should block this PR though. At least we have a way convenient way to test a nanocoap client now.

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