[riot-notifications] [RIOT-OS/RIOT] Send message from host PC to networking boards via border_router (#11534)

Sebastian Meiling notifications at github.com
Mon May 27 09:27:31 CEST 2019

@talalong your setups sounds good and you got many things right and working all ready. 

First, it is correct that you can only ping from host to samr21 node using addresses like `2001:db8::7b62:311b:efa4:9f9e` and not `fe80::<xyz>`. The latter once starting with `fe80` are link local addresses and can only be used to communicate a **single** hop, i.e. from host to router or router to samr21, but not from host to samr21. Addresses like `2001:<abc>` are global addresses and hence are routable. I hope that clarifies the addressing. 

TL;DR: try to use only global addresses or ULAs (IPv6 addresses for private and testing usage, starting with `fc` or `fd` and avoid link local addresses in real deployments. The latter should only be used for network configuration and discovery.

To receive UDP directly in your app you should use the`gnrc_sock_udp` API, have a look at the [test application](https://github.com/RIOT-OS/RIOT/blob/master/tests/gnrc_sock_udp/main.c#L270) for some example code. That should get you startet.

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