以下代码，正常情况下，一切工作正常，可以打印出ConnectComplete

var mSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
mSocket.NoDelay = true;
mSocket.Blocking = false;
mSocket.LingerState = new LingerOption(true, 0);
IPEndPoint point = new IPEndPoint(ipAddress, port);
var asyncEvtArgs = new SocketAsyncEventArgs();
asyncEvtArgs.RemoteEndPoint = point;
asyncEvtArgs.Completed += OnConnectedCompleted;
mSocket.ConnectAsync(asyncEvtArgs);

...

void OnConnectedCompleted(object sender, SocketAsyncEventArgs args)
{
  Debug.Log("ConnectComplete")
}

但是在Android平台上，在游戏内，下拉控制台，点Wifi图标关闭网络，再去连接，则 无法打印出 ConnectComplete，即回调无反应

解决方案为当调用ConnectAsync时，添加一个超时定时器