Hi!

I was writing unit tests for some WebRTC functionality using ex_webrtc, and i noticed something a little strange. In my test, i am basically just connecting two ex_webrtc clients to each other and then waiting for 30s, to see if the connection remains successful. What i noticed is that 10-20% of the times it would fail. I would get the {:connection_state_change, :connected} on both clients so initially it would work, but then eventually i would get {:connection_state_change, :failed}, and a warning from ExICE: 12:07:53.601 [warning] <module=ExICE.Priv.ICEAgent function=change_connection_state/2 line=2576 > Requested ICE agent to move to the failed state but keepalives are not empty. Clearing keepalives.

I was really puzzled about this, so i took a look at the ex_webrtc unit tests to find an example (e.g. ExWebRTC.DataChannelTest), and here i saw that you always only pass the first ice candidate for each peer, and ignore the rest. I tried that, and my test was stable and the connection never failed anymore.

Is there anything that could explain this behavior? I am able to reproduce it on multiple machines. I can provide code and logs if needed.