从Serein.Library分离了WebSocket/Modbus；新增了Json门户类，用于未来的Http、WebSocket、Mqtt、gRPC、QUIC扩展。

Serein.Proto.Modbus/ModbusClientFactory.cs

@@ -0,0 +1,114 @@
+using System.IO.Ports;
+
+namespace Serein.Proto.Modbus
+{
+    public static class ModbusClientFactory
+    {
+        private static readonly char[] separator = new[] { ':' };
+
+        /// <summary>
+        /// 创建 Modbus 客户端实例
+        /// </summary>
+        /// <param name="connectionString">
+        /// 连接字符串格式：
+        /// TCP示例："tcp:192.168.1.100:502"
+        /// UCP示例："ucp:192.168.1.100:502"
+        /// RTU示例："rtu:COM3:9600:1" （格式：rtu:串口名:波特率:从站地址）
+        /// </param>
+        public static IModbusClient Create(string connectionString)
+        {
+            if (string.IsNullOrWhiteSpace(connectionString))
+                throw new ArgumentException("connectionString 不能为空");
+            var parts = connectionString.Split(separator, StringSplitOptions.RemoveEmptyEntries);
+            //var parts = connectionString.Split(':',options: StringSplitOptions.RemoveEmptyEntries);
+            if (parts.Length < 2)
+                throw new ArgumentException("connectionString 格式错误");
+
+            var protocol = parts[0].ToLower();
+
+            if (protocol == "tcp")
+            {
+                // tcp:host:port
+                if (parts.Length < 3)
+                    throw new ArgumentException("TCP格式应为 tcp:host:port");
+
+                string host = parts[1];
+                if (!int.TryParse(parts[2], out int port))
+                    port = 502; // 默认端口
+
+                return new ModbusTcpClient(host, port);
+            }
+            else if (protocol == "ucp")
+            {
+                // ucp:host:port
+                if (parts.Length < 3)
+                    throw new ArgumentException("TCP格式应为 tcp:host:port");
+
+                string host = parts[1];
+                if (!int.TryParse(parts[2], out int port))
+                    port = 502; // 默认端口
+
+                return new ModbusUdpClient(host, port);
+            }
+            else if (protocol == "rtu")
+            {
+                // rtu:portName:baudRate:slaveId
+                if (parts.Length < 4)
+                    throw new ArgumentException("RTU格式应为 rtu:portName:baudRate:slaveId");
+
+                string portName = parts[1];
+                if (!int.TryParse(parts[2], out int baudRate))
+                    baudRate = 9600;
+
+                if (!byte.TryParse(parts[3], out byte slaveId))
+                    slaveId = 1;
+
+                return new ModbusRtuClient(portName, baudRate, slaveId: slaveId);
+            }
+            else
+            {
+                throw new NotSupportedException($"不支持的协议类型: {protocol}");
+            }
+        }
+
+
+        /// <summary>
+        /// 创建 Modbus TCP 客户端
+        /// </summary>
+        /// <param name="host">服务器地址</param>
+        /// <param name="port">端口，默认502</param>
+        public static ModbusTcpClient CreateTcpClient(string host, int port = 502)
+        {
+            return new ModbusTcpClient(host, port);
+        }
+
+        /// <summary>
+        /// 创建 Modbus TCP 客户端
+        /// </summary>
+        /// <param name="host">服务器地址</param>
+        /// <param name="port">端口，默认502</param>
+        public static ModbusUdpClient CreateUdpClient(string host, int port = 502)
+        {
+            return new ModbusUdpClient(host, port);
+        }
+
+        /// <summary>
+        /// 创建 Modbus RTU 客户端
+        /// </summary>
+        /// <param name="portName">串口名，比如 "COM3"</param>
+        /// <param name="baudRate">波特率，默认9600</param>
+        /// <param name="parity">校验，默认None</param>
+        /// <param name="dataBits">数据位，默认8</param>
+        /// <param name="stopBits">停止位，默认1</param>
+        /// <param name="slaveId">从站地址，默认1</param>
+        public static ModbusRtuClient CreateRtuClient(string portName,
+            int baudRate = 9600,
+            Parity parity = Parity.None,
+            int dataBits = 8,
+            StopBits stopBits = StopBits.One,
+            byte slaveId = 1)
+        {
+            return new ModbusRtuClient(portName, baudRate, parity, dataBits, stopBits, slaveId);
+        }
+    }
+}