1. two android client join same room on wifi, publish and subscribe
2. switch one client from wifi to 4g, another one keep wifi
3. sometimes both of them have remote and local stream after network changed. sometimes, the network switch one show up "ICE connection failed" log, the another one remote video stopped and never come back
BTW, I use 4.3.1 sdk, and set continualGatheringPolicy equal GATHER_CONTINUALLY.
