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.Ios/AppDelegate.cs

@@ -6,6 +6,7 @@
using Microsoft.AppCenter.Analytics;
using Microsoft.AppCenter.Crashes;
using Shared;
using Shared.SimpleControl;
using UIKit;
using UserNotifications;

@@ -256,14 +257,14 @@
            //com.freeview.global.Video.FVapplicationDidBecomeActive (application);
        }

        //DateTime closeTime = DateTime.MinValue;
        DateTime closeTime = DateTime.MinValue;
        /// <summary>
        /// BusSocketStop
        /// </summary>
        void BusSocketStop ()
        {
            Shared.BusSocket.Stop ();
            //closeTime = DateTime.Now;
            closeTime = DateTime.Now;
        }


@@ -273,6 +274,14 @@
        void BusSocketStart ()
        {

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

            //if (closeTime == DateTime.MinValue) {
            //    closeTime = DateTime.Now;
            //} else if (closeTime.AddMinutes (2) > DateTime.Now) {