baowei

hi, when I quickly switch between server-side connection states, this problem may occur i think, `IsConnected` check `TcpClient` connected when `TcpClient` connection is ready , but `_networkStream`not ready , ...

use `Host.CreateDefaultBuilder(args)` like **Program.cs** ``` using DataCollector.Core; using SuperSocket; using SuperSocket.ProtoBase; using System.Text; Host.CreateDefaultBuilder(args) .ConfigureWebHostDefaults(configure => { configure.UseStartup(); }) .AsSuperSocketHostBuilder() .UsePackageHandler(async (s, p) => { // echo message back to...