2020-06-24 1. 修改网络请求方法，改为HttpWebRequest支持自定义超时时间，默认10S。 2.后台回前台，超过20S断开远程重新连接。

JLChen

2020-06-24 b6655c930866fadf3275587f4c692aa658bd9b21

 Crabtree/ON/Application.cs

@@ -58,6 +58,9 @@
                reStartApp (this);
                return;
            }

            RegisterActivityLifecycleCallbacks (this);

            //Shared.Application.IsGpsEnable = false;

            base.OnCreate ();
@@ -338,9 +341,9 @@

            if (closeTime == DateTime.MinValue) {
                closeTime = DateTime.Now;
            } else if (closeTime.AddSeconds (10) < DateTime.Now) {
            } else if (closeTime.AddSeconds (20) < DateTime.Now) {
                if (CommonPage.IsRemote) {
                    SmartHome.MqttCommon.DisConnectRemoteMqttClient("closeTime");
                    SmartHome.MqttCommon.DisConnectRemoteMqttClient ("closeTime");
                }
            }