Hi,
The issue we talked about during the whole exercise session was actually very stupid. We were trying to connect between two different computers (and so two different ip, but on the same network), for this to work we need to use the local ip (128.179.... on epfl network) instead of localhost (127.0.0.1).
After we left the zoom we just changed the socket ip in the gui/mod.go from 127.0.0.1:0 to 128.179.<my_ip>:0, and it worked.
Sorry for the inconvenience.