Node Listen logic

Ok, nodes will now listen, drain frame is accepted and acknowleged,
call a method if the node is meant for them, and transmit if frame
was token.

Note that transmit is empty. We now need to implement files if we
want to continue.

Also, not that there are a few todos listed. We need to actually buffer
the frame if it was not acknowlaged, and wait for the next transmit.
What's more, we need to randomly accept frames.

What's more, lets not forget about priority.