P.S: Maybe need to do this:
pip install --upgrade pip or pip install -U pip
First, I started with my RYU server and executed the command:
- > ryu-manager --verbose --observe-links ryu.topology.switches ryu.app.rest_topology ryu.app.ofctl_rest ryu.app.simple_switch
P.S: Currently the GUI doesn't support OF1.3.
Second, open another console to execute this command under your ryu directory. It is a middle-ware between Web and Controller.
- > ./ryu/gui/controller.py