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C#

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Paho.MqttDotnet
{
/// <summary>
/// 表示mqtt连接错误码
/// </summary>
public enum ConnectError
{
/// <summary>
/// 连接已被服务端接受
/// </summary>
ConnectionAccepted = 0x00,
/// <summary>
/// 服务端不支持客户端请求的MQTT协议级别
/// </summary>
UnacceptedProtocolVersion = 0x01,
/// <summary>
/// 客户端标识符是正确的UTF-8编码但服务端不允许使用
/// </summary>
IdentifierRejected = 0x02,
/// <summary>
/// 网络连接已建立但MQTT服务不可用
/// </summary>
BrokerUnavailable = 0x03,
/// <summary>
/// 用户名或密码的数据格式无效
/// </summary>
BadUsernameOrPassword = 0x04,
/// <summary>
/// 客户端未被授权连接到此服务器
/// </summary>
NotAuthorized = 0x05
}
}