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

talalong notifications at github.com
Thu May 16 17:13:38 CEST 2019

**Setup description:**

I have two `samr21-xpro` boards

- The first `samr21(sam_router)` is running` gnrc_border_router` on it, connects to my host PC running `vagrant `on MacOS

- The second `samr21(sam_node)` is running `gnrc_networking` on it, connects to power supply

I have pinged `sam_router` <-> `sam_node` back and forth successfully. 
And also ping from my host PC <->` sam_node` worked as well.

using `ping6 2001:db8::blah::blah`

My goal is to send a message from my host PC via `sam_router` to serveral `sam_node(s)`.

**Here is my first though:**
using `udp server start 8888`, I can start my `sam_nodes` to listen to messages from client.(That means `sam_nodes` are going to burn more power from power supply, prove me wrong pls!)

**My question is**: 
do I have to write a client application for my host PC to send the message to sam_nodes through sam_router ? or are there example like that,
which I did not know about. 
If my though is wrong, I would appreciate if you could tell me how I can do it. Thank you!
Ps: Im a beginner level at this. :(

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