由于有些设备不按规矩来，明明是2013协议的，却在协议头部的版本标识中打上2019的标识，导致协议无法解析，此处添加协议强制解析成2013

src/JT808.Protocol.Test/MessageBody/JT808_0x0200Test.cs

@@ -310,6 +310,22 @@ namespace JT808.Protocol.Test.MessageBody
             Assert.Equal(55, ((JT808_0x0200_0x02)jT808UploadLocationRequest.JT808LocationAttachData[JT808Constants.JT808_0x0200_0x02]).Oil);
         }
         [Fact]
+        public void Test5_3()
+        {
+            byte[] bytes = "7e0100402d01003000067906ff000000003730393639455632350000000000000000000000000000000030303030363739090000000000000000cf7e".ToHexBytes();
+            var jT808Package = JT808Serializer.Deserialize<JT808Package>(bytes,JT808Version.JTT2013Force);
+            jT808Package.Header.ProtocolVersion = 0;//修改成 2013协议标识
+            var newBytes = JT808Serializer.Serialize(jT808Package);//重新序列化
+            var jt808PackageNew = JT808Serializer.Deserialize(newBytes);//验证是否修改标识符成功
+            Assert.Equal(Enums.JT808MsgId.位置信息汇报.ToValue(), jT808Package.Header.MsgId);    
+        }
+        [Fact]
+        public void Test5_4()
+        {
+            byte[] bytes = "7e0200406c010030000681090e00000000000c0003026c936f074c794c0004036300d7210625155739010400000000052801cc00210625155739054145bbc91e4145a2fa1141450000004145bbc8194145a1370a4145000000240200002a0200002b04000000003001153101125f0a89860418231870850620757e".ToHexBytes();
+            var json = JT808Serializer.Analyze(bytes, JT808Version.JTT2013Force);
+        }
+        [Fact]
         public void Test6()
         {
             JT808_0x0200 jT808UploadLocationRequest = new JT808_0x0200

src/JT808.Protocol/Enums/JT808Version.cs

@@ -17,5 +17,9 @@ namespace JT808.Protocol.Enums
         /// 2019
         /// </summary>
         JTT2019=2,
+        /// <summary>
+        /// 强制2013
+        /// </summary>
+        JTT2013Force = 99
     }
 }

src/JT808.Protocol/JT808.Protocol.xml

@@ -1606,6 +1606,11 @@
             2019
             </summary>
         </member>
+        <member name="F:JT808.Protocol.Enums.JT808Version.JTT2013Force">
+            <summary>
+            强制2013
+            </summary>
+        </member>
         <member name="T:JT808.Protocol.Exceptions.JT808Exception">
             <summary>
             JT808异常处理类

src/JT808.Protocol/JT808Package.cs

@@ -104,19 +104,26 @@ namespace JT808.Protocol
             jT808Package.Header.MsgId = reader.ReadUInt16();
             //  3.2.读取消息体属性
             jT808Package.Header.MessageBodyProperty = new JT808HeaderMessageBodyProperty(reader.ReadUInt16());
-            if (reader.Version == JT808Version.JTT2019 || jT808Package.Header.MessageBodyProperty.VersionFlag)
+            if (reader.Version == JT808Version.JTT2013Force)
             {
-                //2019版本
-                jT808Package.Header.ProtocolVersion = reader.ReadByte();
-                //  3.4.读取终端手机号 
-                jT808Package.Header.TerminalPhoneNo = reader.ReadBCD(20, config.Trim);
-                reader.Version = JT808Version.JTT2019;
-            }
-            else
-            {
-                //2013版本
-                //  3.3.读取终端手机号 
                 jT808Package.Header.TerminalPhoneNo = reader.ReadBCD(config.TerminalPhoneNoLength, config.Trim);
+                reader.Version = JT808Version.JTT2013;
+            }
+            else {
+                if (reader.Version == JT808Version.JTT2019 || jT808Package.Header.MessageBodyProperty.VersionFlag)
+                {
+                    //2019版本
+                    jT808Package.Header.ProtocolVersion = reader.ReadByte();
+                    //  3.4.读取终端手机号 
+                    jT808Package.Header.TerminalPhoneNo = reader.ReadBCD(20, config.Trim);
+                    reader.Version = JT808Version.JTT2019;
+                }
+                else
+                {
+                    //2013版本
+                    //  3.3.读取终端手机号 
+                    jT808Package.Header.TerminalPhoneNo = reader.ReadBCD(config.TerminalPhoneNoLength, config.Trim);
+                }
             }
             //  3.4.读取消息流水号
             jT808Package.Header.MsgNum = reader.ReadUInt16();
@@ -279,24 +286,7 @@ namespace JT808.Protocol
             writer.WriteStartObject("消息体属性对象");
             ReadOnlySpan<char> messageBodyPropertyReadOnlySpan = messageBodyPropertyValue.ReadBinary();
             writer.WriteNumber($"[{messageBodyPropertyReadOnlySpan.ToString()}]消息体属性", messageBodyPropertyValue);
-            if (reader.Version == JT808Version.JTT2019 || headerMessageBodyProperty.VersionFlag)
-            {
-                reader.Version = JT808Version.JTT2019;
-                writer.WriteNumber("[bit15]保留", 0);
-                writer.WriteBoolean("[bit14]协议版本标识", headerMessageBodyProperty.VersionFlag);
-                writer.WriteBoolean("[bit13]是否分包", headerMessageBodyProperty.IsPackage);
-                writer.WriteString("[bit10~bit12]数据加密", headerMessageBodyProperty.Encrypt.ToString());
-                writer.WriteNumber("[bit0~bit9]消息体长度", headerMessageBodyProperty.DataLength);
-                //消息体属性对象 结束
-                writer.WriteEndObject();
-                //2019版本
-                var protocolVersion = reader.ReadByte();
-                writer.WriteNumber($"[{protocolVersion.ReadNumber()}]协议版本号(2019)", protocolVersion);
-                //  3.4.读取终端手机号 
-                var terminalPhoneNo = reader.ReadBCD(20, config.Trim);
-                writer.WriteString($"[{terminalPhoneNo.PadLeft(20, '0')}]终端手机号", terminalPhoneNo);
-            }
-            else
+            if (reader.Version == JT808Version.JTT2013Force)
             {
                 reader.Version = JT808Version.JTT2013;
                 writer.WriteNumber("[bit15]保留", 0);
@@ -311,6 +301,41 @@ namespace JT808.Protocol
                 //消息体属性对象 结束
                 writer.WriteString($"[{terminalPhoneNo.PadLeft(config.TerminalPhoneNoLength, '0')}]终端手机号", terminalPhoneNo);
             }
+            else {
+                if (reader.Version == JT808Version.JTT2019 || headerMessageBodyProperty.VersionFlag)
+                {
+                    reader.Version = JT808Version.JTT2019;
+                    writer.WriteNumber("[bit15]保留", 0);
+                    writer.WriteBoolean("[bit14]协议版本标识", headerMessageBodyProperty.VersionFlag);
+                    writer.WriteBoolean("[bit13]是否分包", headerMessageBodyProperty.IsPackage);
+                    writer.WriteString("[bit10~bit12]数据加密", headerMessageBodyProperty.Encrypt.ToString());
+                    writer.WriteNumber("[bit0~bit9]消息体长度", headerMessageBodyProperty.DataLength);
+                    //消息体属性对象 结束
+                    writer.WriteEndObject();
+                    //2019版本
+                    var protocolVersion = reader.ReadByte();
+                    writer.WriteNumber($"[{protocolVersion.ReadNumber()}]协议版本号(2019)", protocolVersion);
+                    //  3.4.读取终端手机号 
+                    var terminalPhoneNo = reader.ReadBCD(20, config.Trim);
+                    writer.WriteString($"[{terminalPhoneNo.PadLeft(20, '0')}]终端手机号", terminalPhoneNo);
+                }
+                else
+                {
+                    reader.Version = JT808Version.JTT2013;
+                    writer.WriteNumber("[bit15]保留", 0);
+                    writer.WriteNumber("[bit14]保留", 0);
+                    writer.WriteBoolean("[bit13]是否分包", headerMessageBodyProperty.IsPackage);
+                    writer.WriteString("[bit10~bit12]数据加密", headerMessageBodyProperty.Encrypt.ToString());
+                    writer.WriteNumber("[bit0~bit9]消息体长度", headerMessageBodyProperty.DataLength);
+                    writer.WriteEndObject();
+                    //2013版本
+                    //  3.3.读取终端手机号 
+                    var terminalPhoneNo = reader.ReadBCD(config.TerminalPhoneNoLength, false);
+                    //消息体属性对象 结束
+                    writer.WriteString($"[{terminalPhoneNo.PadLeft(config.TerminalPhoneNoLength, '0')}]终端手机号", terminalPhoneNo);
+                }
+            }
+
             //  3.4.读取消息流水号
             var msgNum = reader.ReadUInt16();
             writer.WriteNumber($"[{msgNum.ReadNumber()}]消息流水号", msgNum);