Question to RIOT Mesh-Networking

Hello RIOT-Team,

first of all, I want to say thank you for this great project. I was looking for over a year like a project like RIOT.

I'm using a lot of samr21-xpro boards.

My question:

I try to set up a Mesh network, but I can't find the correct header files and no example. Does tutorial 9 creates a Mesh network?? I need a mesh network where Node A (Source node) can't see Node C (Destination node). Only Node B can see A and C and should forward the datas from Node A.

Where in github can I find the code to match?