2020-12-23 1.调整mqtt挤下线，跑ui线程。2.LoadEvent_CheckLinkStatus方法调整

JLChen

2020-12-23 f9f9b0030fdd2691632569b7dcad9d0ddca5e4cf

 HDL_ON/DAL/Mqtt/MqttClient.cs

@@ -557,7 +557,12 @@

            DisConnectRemoteMqttClient("挤下线");

            HDLCommon.Current.CheckLogout();
            Application.RunOnMainThread(() =>
            {
                //弹窗提示被挤下线
                HDLCommon.Current.CheckLogout();
            });
           

            //UserInfo.Current.LastTime = DateTime.MinValue;
            //UserInfo.Current.SaveUserInfo();