<login>

Hello,
How do I find the login I have to fill instead of in:
@:~$ nc m3- 20000

Hello,
It seems you’re talking of TP2, while accessing to node’s serial link. You probably miss something in TP1 where it was explained. Let’s see it again in details.

First, the command asked to run just before into a Terminal is:

ssh $IOTLAB_LOGIN@<site>.iot-lab.info

It allows to connect to the SSH frontend of the site you are using in your experiment. If in the beginning of your notebook you have %env SITE=lyon, then you have to replace <site>.iot-lab.info by lyon.iot-lab.info in the command.

Once you are connected, the Terminal prompt is no more

jovyan@14cce31ec3a3:~/work/iot-lab-training$ 

but something like

fun081391642d@lyon:~$ 

telling that I am user fun081391642d at a computer with hostname lyon (here, the Lyon’s SSH frontend).
To be generic, in notebooks raw cells we prefix command to be executed from SSH frontends with:

<login>@<site>:~$

Thus, when you find a raw cell with this content:

<login>@<site>:~$ nc m3-<id> 20000

it tells you to run the nc command from a SSH frontend. And don’t forget here to also replace with a correct value, i.e. one node id present in the output of the !iotlab-experiment get --nodes command. For example, you could run:

nc m3-10 20000

I hope it’s clearer now.
Good continuation.