GameController is sometimes repeatedly swaping from/to READY/INITIAL about gamecontroller HOT 6 CLOSED

From various RoboCup experience, this kind of bug is very often related to the presence of another GameController running on the same network (since it uses UDP broadcast). In most of our team code, we implemented safe guards to show warnings when there are messages received from two different IPs.

from gamecontroller.

OK, thank you, I will double check it.

from gamecontroller.

That indeed explains many of the headaches I was having because I was running the tests on several machines on the local network here, and they were randomly failing because of this... I shall probably fix the referee to drop UDP packets coming from a different IP address to avoid this problem in the future...

from gamecontroller.

I am indeed receiving packets from two different IP addresses, but strangely, none of them correspond to my local machine... One correspond to another machine on the network running a GameController and the other one correspond to an IP address which is not allocated on my local network. I am not an expert of UDP broadcast and I don't understand why the GameController running on my machine IP=192.168.123.11 is sending UDP packets which the referee receives from IP = 192.168.91.1. Is that normal?

from gamecontroller.

One of the option that might happen is that the interface used is the one from WiFi if your computer is connected through both ethernet and WiFi. Otherwise, I'm not sure of where the issue could come...

from gamecontroller.

I ruled out this by disabling the wifi interface, but the problem remains. It seems UDP broadcast computes a special IP address based on the local IP and broadcast mask... Not sure yet about the details... I will continue to investigate.

from gamecontroller.