#7859 Split NuttX tutorials.

[jfm92]

It left to rework file "getting started" but it will do once every tutorial was uploaded.

[FranFin]

In the ../advanced/nuttx/6lowpan_config/index.md file:

ll: 140-146
Then it will ask you if you want to set this board as a coordinator or as a node. The difference between a coordinator and a node is that the first one can work as a router, coordinating the network traffic of up to 8 nodes. On the other hand, the node is an endpoint device which only sends and receives data, but doesn't coordinate the traffic of the other devices.
For this example, we will set coordinator.
Finally, the program will ask for an ID. This ID must be unique for each board. If everything goes fine, it should return the following:

l 252:
Now you're in the main menu of the App. Type write to enter the sending mode and it will ask for the following data:

l 254:
The destination port: For this specific example it is 61617.

l 276:
Now if you type something and press enter NuttX should output:

l 282:
And the RPI should output the message below:

l 335:
For us it is important to remember the inet6_addr which is: fe80::2be:adde:de:fa00.

l 338:
Execute udp_6lowpan app, type N to the configuration request and finally type read, to start the receiving mode. Type the port that you want to open, for example, the 61616. And it should look like this, meaning that it is waiting for the incoming message.

l 357:
This app returns any data. -> what do you mean here?

l 359:
On the other hand, in the NuttX board we will see the following: