diff --git a/src/JT809Netty.Core/AtomicCounter.cs b/src/JT809Netty.Core/AtomicCounter.cs
new file mode 100644
index 0000000..9b4fcaa
--- /dev/null
+++ b/src/JT809Netty.Core/AtomicCounter.cs
@@ -0,0 +1,39 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading;
+
+namespace JT809Netty.Core
+{
+    /// <summary>
+    /// 
+    /// ref:Grpc.Core.Internal
+    /// </summary>
+    public class AtomicCounter
+    {
+        long counter = 0;
+
+        public AtomicCounter(long initialCount = 0)
+        {
+            this.counter = initialCount;
+        }
+
+        public long Increment()
+        {
+            return Interlocked.Increment(ref counter);
+        }
+
+        public long Decrement()
+        {
+            return Interlocked.Decrement(ref counter);
+        }
+
+        public long Count
+        {
+            get
+            {
+                return Interlocked.Read(ref counter);
+            }
+        }
+    }
+}
diff --git a/src/JT809Netty.Core/Configs/JT809NettyOptions.cs b/src/JT809Netty.Core/Configs/JT809NettyOptions.cs
new file mode 100644
index 0000000..e802b77
--- /dev/null
+++ b/src/JT809Netty.Core/Configs/JT809NettyOptions.cs
@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace JT809Netty.Core.Configs
+{
+    public class JT809NettyOptions
+    {
+        public string Host { get; set; }
+        public int Port { get; set; }
+        public List<string> IpWhiteList { get; set; } = new List<string>();
+        public bool IpWhiteListDisabled { get; set; }
+    }
+}
diff --git a/src/JT809Netty.Core/Handlers/JT808ServiceHandler.cs b/src/JT809Netty.Core/Handlers/JT808ServiceHandler.cs
new file mode 100644
index 0000000..f6e88de
--- /dev/null
+++ b/src/JT809Netty.Core/Handlers/JT808ServiceHandler.cs
@@ -0,0 +1,77 @@
+using DotNetty.Buffers;
+using DotNetty.Transport.Channels;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Text;
+using JT808.Protocol;
+using JT808.Protocol.Extensions;
+using DotNetty.Common.Utilities;
+using Microsoft.Extensions.Logging;
+using Newtonsoft.Json;
+using JT808.Protocol.Exceptions;
+using System.Threading;
+
+namespace GPS.JT808NettyServer.Handlers
+{
+    public class JT808ServiceHandler : ChannelHandlerAdapter
+    {
+        private readonly ILogger<JT808ServiceHandler> logger;
+
+        private readonly JT808MsgIdHandler jT808MsgIdHandler;
+
+        public JT808ServiceHandler(
+            JT808MsgIdHandler jT808MsgIdHandler,
+            ILoggerFactory loggerFactory)
+        {
+            this.jT808MsgIdHandler = jT808MsgIdHandler;
+            logger = loggerFactory.CreateLogger<JT808ServiceHandler>();
+        }
+
+        public override void ChannelRead(IChannelHandlerContext context, object message)
+        {
+            var jT808RequestInfo = (JT808RequestInfo)message;
+            string receive = string.Empty;
+            try
+            {
+                if (logger.IsEnabled(LogLevel.Debug))
+                {
+                    receive = jT808RequestInfo.OriginalBuffer.ToHexString();
+                }
+                Func<JT808RequestInfo, IChannelHandlerContext,IJT808Package> handlerFunc;
+                if (jT808RequestInfo.JT808Package != null)
+                {
+                    if (jT808MsgIdHandler.HandlerDict.TryGetValue(jT808RequestInfo.JT808Package.Header.MsgId, out handlerFunc))
+                    {
+                        IJT808Package jT808PackageImpl = handlerFunc(jT808RequestInfo, context);
+                        if (jT808PackageImpl != null)
+                        {
+                            if (logger.IsEnabled(LogLevel.Debug))
+                            {
+                                logger.LogDebug("send>>>" + jT808PackageImpl.JT808Package.Header.MsgId.ToString() + "-" + JT808Serializer.Serialize(jT808PackageImpl.JT808Package).ToHexString());
+                                //logger.LogDebug("send>>>" + jT808PackageImpl.JT808Package.Header.MsgId.ToString() + "-" + JsonConvert.SerializeObject(jT808PackageImpl.JT808Package));
+                            }
+                            // 需要注意：
+                            // 1.下发应答必须要在类中重写 ChannelReadComplete 不然客户端接收不到消息
+                            // context.WriteAsync(Unpooled.WrappedBuffer(JT808Serializer.Serialize(jT808PackageImpl.JT808Package)));
+                            // 2.直接发送
+                            context.WriteAndFlushAsync(Unpooled.WrappedBuffer(JT808Serializer.Serialize(jT808PackageImpl.JT808Package)));
+                        }
+                    }
+                }
+            }
+            catch (JT808Exception ex)
+            {
+                if (logger.IsEnabled(LogLevel.Error))
+                    logger.LogError(ex, "JT808Exception receive<<<" + receive);
+            }
+            catch (Exception ex)
+            {
+                if (logger.IsEnabled(LogLevel.Error))
+                    logger.LogError(ex, "Exception receive<<<" + receive);
+            }
+        }
+
+        public override void ChannelReadComplete(IChannelHandlerContext context) => context.Flush();
+    }
+}
diff --git a/src/JT809Netty.Core/Handlers/JT809DecodeHandler.cs b/src/JT809Netty.Core/Handlers/JT809DecodeHandler.cs
new file mode 100644
index 0000000..9a55292
--- /dev/null
+++ b/src/JT809Netty.Core/Handlers/JT809DecodeHandler.cs
@@ -0,0 +1,64 @@
+using DotNetty.Buffers;
+using DotNetty.Codecs;
+using DotNetty.Transport.Channels;
+using JT809.Protocol;
+using JT809.Protocol.JT809Exceptions;
+using Microsoft.Extensions.Logging;
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading;
+
+namespace JT809Netty.Core.Handlers
+{
+    /// <summary>
+    /// JT809解码
+    /// </summary>
+    public class JT809DecodeHandler : ByteToMessageDecoder
+    {
+        private readonly ILogger<JT809DecodeHandler> logger;
+
+        public JT809DecodeHandler(ILoggerFactory loggerFactory)
+        {
+            logger = loggerFactory.CreateLogger<JT809DecodeHandler>();
+        }
+
+        private static readonly AtomicCounter MsgSuccessCounter = new AtomicCounter();
+
+        private static readonly AtomicCounter MsgFailCounter = new AtomicCounter();
+
+        protected override void Decode(IChannelHandlerContext context, IByteBuffer input, List<object> output)
+        {
+            string msg = string.Empty;
+            byte[] buffer = null;
+            try
+            {
+                buffer = new byte[input.Capacity + 2];
+                input.ReadBytes(buffer,1, input.Capacity);
+                buffer[0] = JT809Package.BEGINFLAG;
+                buffer[input.Capacity + 1] = JT809Package.ENDFLAG;
+                output.Add(JT809Serializer.Deserialize(buffer));
+                MsgSuccessCounter.Increment();
+                if (logger.IsEnabled(LogLevel.Debug))
+                {
+                    msg = ByteBufferUtil.HexDump(buffer);
+                    logger.LogDebug("accept package success count<<<" + MsgSuccessCounter.Count.ToString());
+                }
+            }
+            catch (JT809Exception ex)
+            {
+                MsgFailCounter.Increment();
+                logger.LogError("accept package fail count<<<" + MsgFailCounter.Count.ToString());
+                logger.LogError(ex, $"{ex.ErrorCode.ToString()}accept msg<<<{msg}");
+                return;
+            }
+            catch (Exception ex)
+            {
+                MsgFailCounter.Increment();
+                logger.LogError("accept package fail count<<<" + MsgFailCounter.Count.ToString());
+                logger.LogError(ex, "accept msg<<<" + msg);
+                return;
+            }
+        }
+    }
+}
diff --git a/src/JT809Netty.Core/Handlers/JT809DownMasterLinkConnectionHandler.cs b/src/JT809Netty.Core/Handlers/JT809DownMasterLinkConnectionHandler.cs
new file mode 100644
index 0000000..4793815
--- /dev/null
+++ b/src/JT809Netty.Core/Handlers/JT809DownMasterLinkConnectionHandler.cs
@@ -0,0 +1,89 @@
+using DotNetty.Handlers.Timeout;
+using DotNetty.Transport.Channels;
+using JT809Netty.Core.Configs;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+using System.Threading.Tasks;
+
+namespace JT809Netty.Core.Handlers
+{
+    /// <summary>
+    /// 下级平台主链路
+    /// </summary>
+    public class JT809DownMasterLinkConnectionHandler : ChannelHandlerAdapter
+    {
+        private readonly ILogger<JT809DownMasterLinkConnectionHandler> logger;
+
+        private IOptionsMonitor<JT809NettyOptions> optionsMonitor;
+
+        public JT809DownMasterLinkConnectionHandler(
+            IOptionsMonitor<JT809NettyOptions> optionsMonitor,
+            SessionManager sessionManager,
+            ILoggerFactory loggerFactory)
+        {
+            this.optionsMonitor = optionsMonitor;
+            logger = loggerFactory.CreateLogger<JT809DownMasterLinkConnectionHandler>();
+        }
+
+        public override void ChannelActive(IChannelHandlerContext context)
+        {
+            base.ChannelActive(context);
+        }
+
+        /// <summary>
+        /// 主动断开
+        /// </summary>
+        /// <param name="context"></param>
+        public override void ChannelInactive(IChannelHandlerContext context)
+        {
+            if (logger.IsEnabled(LogLevel.Debug))
+                logger.LogDebug(">>>The client disconnects from the server.");
+            base.ChannelInactive(context);
+        }
+
+        /// <summary>
+        /// 服务器主动断开
+        /// </summary>
+        /// <param name="context"></param>
+        /// <returns></returns>
+        public override Task CloseAsync(IChannelHandlerContext context)
+        {
+            if (logger.IsEnabled(LogLevel.Debug))
+                logger.LogDebug("<<<The server disconnects from the client.");
+            return base.CloseAsync(context);
+        }
+
+        /// <summary>
+        /// 主链路超时策略
+        /// 下级平台登录成功后，在与上级平台之间如果有应用业务数据包往来的情况下，不需要发送主链路保持数据包; 
+        ///  否则，下级平台应每 1min 发送一个主链路保持清求数据包到上级平台以保持链路连接
+        /// </summary>
+        /// <param name="context"></param>
+        /// <param name="evt"></param>
+        public override void UserEventTriggered(IChannelHandlerContext context, object evt)
+        {
+            IdleStateEvent idleStateEvent = evt as IdleStateEvent;
+            if (idleStateEvent != null)
+            {
+                string channelId = context.Channel.Id.AsShortText();
+                logger.LogInformation($"{idleStateEvent.State.ToString()}>>>{channelId}");
+                switch (idleStateEvent.State)
+                {
+                    //case IdleState.ReaderIdle:
+
+                    //    break;
+                    case IdleState.WriterIdle:
+#warning 发送心跳保持
+                        break;
+                    //case IdleState.AllIdle:
+
+                    //    break;
+                    default:
+
+                        break;
+                }
+            }
+            base.UserEventTriggered(context, evt);
+        }
+    }
+}
diff --git a/src/JT809Netty.Core/Handlers/JT809DownSlaveLinkConnectionHandler.cs b/src/JT809Netty.Core/Handlers/JT809DownSlaveLinkConnectionHandler.cs
new file mode 100644
index 0000000..97f521b
--- /dev/null
+++ b/src/JT809Netty.Core/Handlers/JT809DownSlaveLinkConnectionHandler.cs
@@ -0,0 +1,91 @@
+using DotNetty.Handlers.Timeout;
+using DotNetty.Transport.Channels;
+using JT809Netty.Core.Configs;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+using System.Threading.Tasks;
+
+namespace JT809Netty.Core.Handlers
+{
+    /// <summary>
+    /// 下级平台从链路
+    /// </summary>
+    public class JT809DownSlaveLinkConnectionHandler : ChannelHandlerAdapter
+    {
+        private readonly ILogger<JT809DownSlaveLinkConnectionHandler> logger;
+
+        private readonly SessionManager sessionManager;
+
+        private IOptionsMonitor<JT809NettyOptions> optionsMonitor;
+
+        public JT809DownSlaveLinkConnectionHandler(
+            IOptionsMonitor<JT809NettyOptions> optionsMonitor,
+            SessionManager sessionManager,
+            ILoggerFactory loggerFactory)
+        {
+            this.optionsMonitor = optionsMonitor;
+            this.sessionManager = sessionManager;
+            logger = loggerFactory.CreateLogger<JT809DownSlaveLinkConnectionHandler>();
+        }
+
+        public override void ChannelActive(IChannelHandlerContext context)
+        {
+            base.ChannelActive(context);
+        }
+
+        /// <summary>
+        /// 主动断开
+        /// </summary>
+        /// <param name="context"></param>
+        public override void ChannelInactive(IChannelHandlerContext context)
+        {
+            if (logger.IsEnabled(LogLevel.Debug))
+                logger.LogDebug(">>>The client disconnects from the server.");
+            sessionManager.RemoveSessionByID(context.Channel.Id.AsShortText());
+            base.ChannelInactive(context);
+        }
+        /// <summary>
+        /// 服务器主动断开
+        /// </summary>
+        /// <param name="context"></param>
+        /// <returns></returns>
+        public override Task CloseAsync(IChannelHandlerContext context)
+        {
+            if (logger.IsEnabled(LogLevel.Debug))
+                logger.LogDebug("<<<The server disconnects from the client.");
+            return base.CloseAsync(context);
+        }
+
+        /// <summary>
+        /// 从链路超时策略
+        /// </summary>
+        /// <param name="context"></param>
+        /// <param name="evt"></param>
+        public override void UserEventTriggered(IChannelHandlerContext context, object evt)
+        {
+            IdleStateEvent idleStateEvent = evt as IdleStateEvent;
+            if (idleStateEvent != null)
+            {
+                string channelId = context.Channel.Id.AsShortText();
+                logger.LogInformation($"{idleStateEvent.State.ToString()}>>>{channelId}");
+                switch (idleStateEvent.State)
+                {
+                    case IdleState.ReaderIdle:
+                        //下级平台连续 3min 未收到上级平台发送的从链路保持应答数据包，则认为上级平台的连接中断，将主动断开数据传输从链路。
+                        context.CloseAsync();
+                        break;
+                    //case IdleState.WriterIdle:
+
+                    //    break;
+                    //case IdleState.AllIdle:
+
+                    //    break;
+                    default:
+
+                        break;
+                }
+            }
+            base.UserEventTriggered(context, evt);
+        }
+    }
+}
diff --git a/src/JT809Netty.Core/IAppSession.cs b/src/JT809Netty.Core/IAppSession.cs
new file mode 100644
index 0000000..7924137
--- /dev/null
+++ b/src/JT809Netty.Core/IAppSession.cs
@@ -0,0 +1,19 @@
+using DotNetty.Transport.Channels;
+using System;
+using System.Collections.Generic;
+using System.Net;
+using System.Text;
+
+namespace JT809Netty.Core
+{
+    public interface IAppSession
+    {
+        string SessionID { get; }
+
+        IChannel Channel { get; }
+
+        DateTime LastActiveTime { get; set; }
+
+        DateTime StartTime { get; }
+    }
+}
diff --git a/src/JT809Netty.Core/JT809DownMasterLinkNettyService.cs b/src/JT809Netty.Core/JT809DownMasterLinkNettyService.cs
new file mode 100644
index 0000000..4d752a3
--- /dev/null
+++ b/src/JT809Netty.Core/JT809DownMasterLinkNettyService.cs
@@ -0,0 +1,101 @@
+using DotNetty.Buffers;
+using DotNetty.Codecs;
+using DotNetty.Handlers.Timeout;
+using DotNetty.Transport.Bootstrapping;
+using DotNetty.Transport.Channels;
+using DotNetty.Transport.Channels.Sockets;
+using DotNetty.Transport.Libuv;
+using JT809Netty.Core.Configs;
+using JT809Netty.Core.Handlers;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Options;
+using System;
+using System.Collections.Generic;
+using System.Net;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace JT809Netty.Core
+{
+    /// <summary>
+    /// 下级平台主链路
+    /// </summary
+    public class JT809DownMasterLinkNettyService : IHostedService
+    {
+        IEventLoopGroup workerGroup;
+
+        Bootstrap bootstrap;
+
+        readonly IServiceProvider serviceProvider;
+
+        readonly IOptionsMonitor<JT809NettyOptions> nettyOptions;
+
+        public JT809DownMasterLinkNettyService(
+            IOptionsMonitor<JT809NettyOptions> nettyOptionsAccessor,
+            IServiceProvider serviceProvider)
+        {
+            nettyOptions = nettyOptionsAccessor;
+            this.serviceProvider = serviceProvider;
+        }
+
+        public Task StartAsync(CancellationToken cancellationToken)
+        {
+            nettyOptions.OnChange(options =>
+            {
+                try
+                {
+                    bootstrap.ConnectAsync(options.Host, options.Port);
+                }
+                catch (Exception ex)
+                {
+
+                }
+            });
+            try
+            {
+                workerGroup = new MultithreadEventLoopGroup();
+                bootstrap = new Bootstrap();
+                bootstrap.Group(workerGroup)
+                         .Channel<TcpServerChannel>()
+                         .Handler(new ActionChannelInitializer<IChannel>(channel =>
+                           {
+                               InitChannel(channel);
+                         }))
+                       .Option(ChannelOption.SoBacklog, 1048576);
+                bootstrap.ConnectAsync(nettyOptions.CurrentValue.Host, nettyOptions.CurrentValue.Port);
+            }
+            catch (Exception ex)
+            {
+
+            }
+            return Task.CompletedTask;
+        }
+
+        public Task StopAsync(CancellationToken cancellationToken)
+        {
+            try
+            {
+                Task.WhenAll(workerGroup.ShutdownGracefullyAsync(TimeSpan.FromMilliseconds(100), TimeSpan.FromSeconds(1)));
+            }
+            catch (Exception ex)
+            {
+
+            }
+            return Task.CompletedTask;
+        }
+
+        private void InitChannel(IChannel channel)
+        {
+            var scope = serviceProvider.CreateScope();
+            //下级平台应每 1min 发送一个主链路保持清求数据包到上级平台以保持链路连接
+            channel.Pipeline.AddLast("systemIdleState", new WriteTimeoutHandler(60));
+            channel.Pipeline.AddLast("jt809DownMasterLinkConnection", scope.ServiceProvider.GetRequiredService<JT809DownMasterLinkConnectionHandler>()); 
+            channel.Pipeline.AddLast("jt809Buffer", new DelimiterBasedFrameDecoder(int.MaxValue, Unpooled.CopiedBuffer(new byte[] { JT809.Protocol.JT809Package.BEGINFLAG }), Unpooled.CopiedBuffer(new byte[] { JT809.Protocol.JT809Package.ENDFLAG })));
+            channel.Pipeline.AddLast("jt809Decode", scope.ServiceProvider.GetRequiredService<JT809DecodeHandler>());
+            //channel.Pipeline.AddLast("jt809Service", scope.ServiceProvider.GetRequiredService<JT808ServiceHandler>());
+            scope.Dispose();
+        }
+    }
+}
diff --git a/src/JT809Netty.Core/JT809DownSlaveLinkNettyService.cs b/src/JT809Netty.Core/JT809DownSlaveLinkNettyService.cs
new file mode 100644
index 0000000..416c563
--- /dev/null
+++ b/src/JT809Netty.Core/JT809DownSlaveLinkNettyService.cs
@@ -0,0 +1,104 @@
+using DotNetty.Buffers;
+using DotNetty.Codecs;
+using DotNetty.Handlers.Timeout;
+using DotNetty.Transport.Bootstrapping;
+using DotNetty.Transport.Channels;
+using DotNetty.Transport.Libuv;
+using JT809Netty.Core.Configs;
+using JT809Netty.Core.Handlers;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Options;
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace JT809Netty.Core
+{
+    /// <summary>
+    /// 下级平台从链路
+    /// </summary>
+    public class JT809DownSlaveLinkNettyService : IHostedService
+    {
+        IEventLoopGroup bossGroup;
+
+        IEventLoopGroup workerGroup;
+
+        IChannel boundChannel;
+
+        readonly IServiceProvider serviceProvider;
+
+        readonly JT809NettyOptions nettyOptions;
+
+        public JT809DownSlaveLinkNettyService(
+            IOptions<JT809NettyOptions> nettyOptionsAccessor,
+            IServiceProvider serviceProvider)
+        {
+            nettyOptions = nettyOptionsAccessor.Value;
+            this.serviceProvider = serviceProvider;
+        }
+
+        public Task StartAsync(CancellationToken cancellationToken)
+        {
+            try
+            {
+                var dispatcher = new DispatcherEventLoopGroup();
+                bossGroup = dispatcher;
+                workerGroup = new WorkerEventLoopGroup(dispatcher);
+                var bootstrap = new ServerBootstrap();
+                bootstrap.Group(bossGroup, workerGroup);
+                bootstrap.Channel<TcpServerChannel>();
+                bootstrap
+                       //.Handler(new LoggingHandler("SRV-LSTN"))
+                       .ChildHandler(new ActionChannelInitializer<IChannel>(channel =>
+                       {
+                           InitChannel(channel);
+                       }))
+                       .Option(ChannelOption.SoBacklog, 1048576);
+                if (nettyOptions.Host == "")
+                {
+                    boundChannel = bootstrap.BindAsync(nettyOptions.Port).Result;
+                }
+                else
+                {
+                    boundChannel = bootstrap.BindAsync(nettyOptions.Host, nettyOptions.Port).Result;
+                }
+            }
+            catch (Exception ex)
+            {
+
+            }
+            return Task.CompletedTask;
+        }
+
+        public Task StopAsync(CancellationToken cancellationToken)
+        {
+            try
+            {
+                Task.WhenAll(
+                  bossGroup.ShutdownGracefullyAsync(TimeSpan.FromMilliseconds(100), TimeSpan.FromSeconds(1)),
+                  workerGroup.ShutdownGracefullyAsync(TimeSpan.FromMilliseconds(100), TimeSpan.FromSeconds(1)),
+                  boundChannel.CloseAsync());
+            }
+            catch (Exception ex)
+            {
+
+            }
+            return Task.CompletedTask;
+        }
+
+        private void InitChannel(IChannel channel)
+        {
+            var scope = serviceProvider.CreateScope();
+            //下级平台连续 3min 未收到上级平台发送的从链路保持应答数据包，则认为上级平台的连接中断，将主动断开数据传输从链路。
+            channel.Pipeline.AddLast("systemIdleState", new ReadTimeoutHandler(180));
+            channel.Pipeline.AddLast("jt809DownSlaveLinkConnection", scope.ServiceProvider.GetRequiredService<JT809DownSlaveLinkConnectionHandler>()); 
+            channel.Pipeline.AddLast("jt809Buffer", new DelimiterBasedFrameDecoder(int.MaxValue, Unpooled.CopiedBuffer(new byte[] { JT809.Protocol.JT809Package.BEGINFLAG }), Unpooled.CopiedBuffer(new byte[] { JT809.Protocol.JT809Package.ENDFLAG })));
+            channel.Pipeline.AddLast("jt809Decode", scope.ServiceProvider.GetRequiredService<JT809DecodeHandler>());
+            //channel.Pipeline.AddLast("jt809Service", scope.ServiceProvider.GetRequiredService<JT808ServiceHandler>());
+            scope.Dispose();
+        }
+    }
+}
diff --git a/src/JT809Netty.Core/JT809Netty.Core.csproj b/src/JT809Netty.Core/JT809Netty.Core.csproj
new file mode 100644
index 0000000..74aa6ca
--- /dev/null
+++ b/src/JT809Netty.Core/JT809Netty.Core.csproj
@@ -0,0 +1,22 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <LangVersion>latest</LangVersion>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Remove="Handlers\JT808ServiceHandler.cs" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="DotNetty.Handlers" Version="0.5.0" />
+    <PackageReference Include="DotNetty.Transport.Libuv" Version="0.5.0" />
+    <PackageReference Include="JT809" Version="1.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Hosting.Abstractions" Version="2.1.1" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="2.1.1" />
+    <PackageReference Include="Microsoft.Extensions.Options" Version="2.1.1" />
+    <PackageReference Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="2.1.1" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/JT809Netty.Core/JT809Session.cs b/src/JT809Netty.Core/JT809Session.cs
new file mode 100644
index 0000000..c7854c5
--- /dev/null
+++ b/src/JT809Netty.Core/JT809Session.cs
@@ -0,0 +1,39 @@
+using DotNetty.Transport.Channels;
+using System;
+using JT809.Protocol.JT809Enums;
+
+namespace JT809Netty.Core
+{
+    public class JT809Session: IAppSession
+    {
+        public JT809Session(IChannel channel, string vehicleNo,JT809VehicleColorType vehicleColor)
+        {
+            Channel = channel;
+            VehicleNo = vehicleNo;
+            VehicleColor = vehicleColor;
+            StartTime = DateTime.Now;
+            LastActiveTime = DateTime.Now;
+            SessionID = Channel.Id.AsShortText();
+            Key = $"{VehicleNo}_{VehicleColor.ToString()}";
+        }
+
+        /// <summary>
+        /// 车牌号
+        /// </summary>
+        public string VehicleNo { get; set; }
+        /// <summary>
+        /// 车牌颜色
+        /// </summary>
+        public JT809VehicleColorType VehicleColor { get; set; }
+
+        public string Key { get; set; }
+
+        public string SessionID { get; }
+
+        public IChannel Channel { get;}
+
+        public DateTime LastActiveTime { get; set; }
+
+        public DateTime StartTime { get; }
+    }
+}
diff --git a/src/JT809Netty.Core/SessionManager.cs b/src/JT809Netty.Core/SessionManager.cs
new file mode 100644
index 0000000..0c69bad
--- /dev/null
+++ b/src/JT809Netty.Core/SessionManager.cs
@@ -0,0 +1,220 @@
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Logging.Abstractions;
+using System;
+using System.Collections.Concurrent;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace JT809Netty.Core
+{
+    public class SessionManager:IDisposable
+    {
+        private readonly ILogger<SessionManager> logger;
+
+        private readonly CancellationTokenSource cancellationTokenSource;
+
+#if DEBUG
+        private const int timeout = 1 * 1000 * 60;
+#else
+        private const int timeout = 5 * 1000 * 60;
+#endif
+        public SessionManager(ILoggerFactory loggerFactory)
+        {
+            logger = loggerFactory.CreateLogger<SessionManager>();
+            cancellationTokenSource = new CancellationTokenSource();
+            Task.Run(() =>
+            {
+                while (!cancellationTokenSource.IsCancellationRequested)
+                {
+                    logger.LogInformation($"Online Count>>>{SessionCount}");
+                    if (SessionCount > 0)
+                    {
+                        logger.LogInformation($"SessionIds>>>{string.Join(",", SessionIdDict.Select(s => s.Key))}");
+                        logger.LogInformation($"TerminalPhoneNos>>>{string.Join(",", CustomKey_SessionId_Dict.Select(s => $"{s.Key}-{s.Value}"))}");
+                    }
+                    Thread.Sleep(timeout);
+                }
+            }, cancellationTokenSource.Token);
+        }
+
+        /// <summary>
+        /// Netty生成的sessionID和Session的对应关系
+        /// key = seession id
+        /// value = Session
+        /// </summary>
+        private ConcurrentDictionary<string, JT809Session> SessionIdDict = new ConcurrentDictionary<string, JT809Session>(StringComparer.OrdinalIgnoreCase);
+        /// <summary>
+        /// 自定义Key和netty生成的sessionID的对应关系
+        /// key = 终端手机号
+        /// value = seession id
+        /// </summary>
+        private ConcurrentDictionary<string, string> CustomKey_SessionId_Dict = new ConcurrentDictionary<string, string>(StringComparer.OrdinalIgnoreCase);
+
+        public int SessionCount
+        {
+            get
+            {
+                return SessionIdDict.Count;
+            }
+        }
+
+        public void RegisterSession(JT809Session appSession)
+        {
+            if (CustomKey_SessionId_Dict.ContainsKey(appSession.Key))
+            {
+                return;
+            }
+            if (SessionIdDict.TryAdd(appSession.SessionID, appSession) &&
+                CustomKey_SessionId_Dict.TryAdd(appSession.Key, appSession.SessionID))
+            {
+                return;
+            }
+        }
+
+        public JT809Session GetSessionByID(string sessionID)
+        {
+            if (string.IsNullOrEmpty(sessionID))
+                return default;
+            JT809Session targetSession;
+            SessionIdDict.TryGetValue(sessionID, out targetSession);
+            return targetSession;
+        }
+
+        public JT809Session GetSessionByTerminalPhoneNo(string key)
+        {
+            try
+            {
+                if (string.IsNullOrEmpty(key))
+                    return default;
+                if (CustomKey_SessionId_Dict.TryGetValue(key, out string sessionId))
+                {
+                    if (SessionIdDict.TryGetValue(sessionId, out JT809Session targetSession))
+                    {
+                        return targetSession;
+                    }
+                    else
+                    {
+                        return default;
+                    }
+                }
+                else
+                {
+                    return default;
+                }
+            }
+            catch (Exception ex)
+            {
+                logger.LogError(ex, key);
+                return default;
+            }
+        }
+
+        public void Heartbeat(string key)
+        {
+            try
+            {
+                if(CustomKey_SessionId_Dict.TryGetValue(key, out string sessionId))
+                {
+                    if (SessionIdDict.TryGetValue(sessionId, out JT809Session oldjT808Session))
+                    {
+                        if (oldjT808Session.Channel.Active)
+                        {
+                            oldjT808Session.LastActiveTime = DateTime.Now;
+                            if (SessionIdDict.TryUpdate(sessionId, oldjT808Session, oldjT808Session))
+                            {
+
+                            }
+                        }
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                logger.LogError(ex, key);
+            }
+        }
+
+        /// <summary>
+        /// 通过通道Id和自定义key进行关联
+        /// </summary>
+        /// <param name="sessionID"></param>
+        /// <param name="key"></param>
+        public void UpdateSessionByID(string sessionID, string key)
+        {
+            try
+            {
+                if (SessionIdDict.TryGetValue(sessionID, out JT809Session oldjT808Session))
+                {
+                    oldjT808Session.Key = key;
+                    if (SessionIdDict.TryUpdate(sessionID, oldjT808Session, oldjT808Session))
+                    {
+                        CustomKey_SessionId_Dict.AddOrUpdate(key, sessionID, (tpn, sid) =>
+                        {
+                            return sessionID;
+                        });
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                logger.LogError(ex, $"{sessionID},{key}");
+            }
+        }
+
+        public void RemoveSessionByID(string sessionID)
+        {
+            if (sessionID == null) return;
+            try
+            {
+                if (SessionIdDict.TryRemove(sessionID, out JT809Session session))
+                {
+                    if (session.Key != null)
+                    {
+                        if(CustomKey_SessionId_Dict.TryRemove(session.Key, out string sessionid))
+                        {
+                            logger.LogInformation($">>>{sessionID}-{session.Key} Session Remove.");
+                        }
+                    }
+                    else
+                    {
+                        logger.LogInformation($">>>{sessionID} Session Remove.");
+                    }
+                    session.Channel.CloseAsync();
+                }
+            }
+            catch (Exception ex)
+            {
+                logger.LogError(ex, $">>>{sessionID} Session Remove Exception");
+            }
+        }
+
+        public void RemoveSessionByKey(string key)
+        {
+            if (key == null) return;
+            try
+            {
+                if (CustomKey_SessionId_Dict.TryRemove(key, out string sessionid))
+                {
+                    if (SessionIdDict.TryRemove(sessionid, out JT809Session session))
+                    {
+                        logger.LogInformation($">>>{key}-{sessionid} Key Remove.");
+                    }
+                    else
+                    {
+                        logger.LogInformation($">>>{key} Key Remove.");
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                logger.LogError(ex, $">>>{key} Key Remove Exception.");
+            }
+        }
+
+        public void Dispose()
+        {
+            cancellationTokenSource.Cancel();
+        }
+    }
+}
diff --git a/src/JT809Netty.sln b/src/JT809Netty.sln
new file mode 100644
index 0000000..5b0b11d
--- /dev/null
+++ b/src/JT809Netty.sln
@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.28010.2016
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "JT809Netty.Core", "JT809Netty.Core\JT809Netty.Core.csproj", "{2054D7E6-53B6-412F-BE9D-C6DABD80A111}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{2054D7E6-53B6-412F-BE9D-C6DABD80A111}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{2054D7E6-53B6-412F-BE9D-C6DABD80A111}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{2054D7E6-53B6-412F-BE9D-C6DABD80A111}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{2054D7E6-53B6-412F-BE9D-C6DABD80A111}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {0FC2A52E-3B7A-4485-9C3B-9080C825419D}
+	EndGlobalSection
+EndGlobal
diff --git a/src/JT809NettyServer/JT809NettyServer.csproj b/src/JT809NettyServer/JT809NettyServer.csproj
new file mode 100644
index 0000000..d3fc122
--- /dev/null
+++ b/src/JT809NettyServer/JT809NettyServer.csproj
@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp2.1</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="JT809" Version="1.0.0" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/JT809NettyServer/Program.cs b/src/JT809NettyServer/Program.cs
new file mode 100644
index 0000000..a596836
--- /dev/null
+++ b/src/JT809NettyServer/Program.cs
@@ -0,0 +1,12 @@
+using System;
+
+namespace JT809NettyServer
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("Hello World!");
+        }
+    }
+}