使用MQTTnet部署MQTT服务（转）-布布扣-bubuko.com

下载地址：https://github.com/chkr1011/MQTTnet

一. 服务端

1. 创建配置参数

可以使用 `var options = new MqttServerOptions();` 直接构建一个options。你也可以通过参数构建器 `var options = new MqttServerOptionsBuilder();` 使代码更简洁美观。

构建器的函数说明：

函数名	功能说明
Build	构建配置参数
WithApplicationMessageInterceptor	允许处理来自客户端的所有已发布消息
WithClientId	服务端发布消息时使用的ClientId
WithConnectionBacklog	设置要保留的连接数
WithConnectionValidator	验证连接
WithDefaultCommunicationTimeout	设置默认的通信超时
WithDefaultEndpoint	使用默认端点
WithDefaultEndpointBoundIPAddress	使用默认端点IPv4地址
WithDefaultEndpointBoundIPV6Address	使用默认端点IPv6地址
WithDefaultEndpointPort	使用默认端点端口
WithEncryptedEndpoint	使用加密的端点
WithEncryptedEndpointBoundIPAddress	使用加密的端点IPv4地址
WithEncryptedEndpointBoundIPV6Address	使用加密的端点IPv6地址
WithEncryptedEndpointPort	使用加密的端点端口
WithEncryptionCertificate	使用证书进行SSL连接
WithEncryptionSslProtocol	使用SSL协议级别
WithMaxPendingMessagesPerClient	每个客户端允许最多未决消息
WithPersistentSessions	保持会话
WithStorage	使用存储
WithSubscriptionInterceptor	允许处理来自客户端的所有订阅
WithoutDefaultEndpoint	禁用默认端点
WithoutEncryptedEndpoint	禁用默认(SSL)端点

验证账号密码

options.WithConnectionValidator(c =>
{
if (c.Username != "seven")
{
c.ReasonCode = MqttConnectReasonCode.BadUserNameOrPassword;
}
});

2. 启动服务端

var server = new MqttFactory().CreateMqttServer();
server.StartAsync(options.Build());

服务启动事件

server.StartedHandler = new MqttServerStartedHandlerDelegate(Started);
static async Task Started(EventArgs e)
{
Console.WriteLine("Started");
}

服务关闭事件

server.StoppedHandler = new MqttServerStoppedHandlerDelegate(Stopped);
static async Task Stopped(EventArgs e)
{
Console.WriteLine("Stopped");
}

客户端连接事件

server.ClientConnectedHandler = new MqttServerClientConnectedHandlerDelegate(Connected);

server.UseClientConnectedHandler(c => Connected(c));
static async Task Connected(MqttServerClientConnectedEventArgs e)
{
Console.WriteLine($"{e.ClientId} connected");
}

客户端断开事件

server.ClientDisconnectedHandler = new MqttServerClientDisconnectedHandlerDelegate(Disconnected);

server.UseClientDisconnectedHandler(c => Disconnected(c));
static async Task Disconnected(MqttServerClientDisconnectedEventArgs e)
{
Console.WriteLine($"{e.ClientId} disconnected");
}

客户端订阅Topic

server.ClientSubscribedTopicHandler = new MqttServerClientSubscribedHandlerDelegate(Subscribed);
static async Task Subscribed(MqttServerClientSubscribedTopicEventArgs e)
{
Console.WriteLine($"{e.ClientId} subscribed {e.TopicFilter.Topic}");
}

客户端取消订阅Topic

server.ClientUnsubscribedTopicHandler = new MqttServerClientUnsubscribedTopicHandlerDelegate(c => Unsubscribed(c));
static async Task Unsubscribed(MqttServerClientUnsubscribedTopicEventArgs e)
{
Console.WriteLine($"{e.ClientId} unsubscribed {e.TopicFilter}");
}

消息接收

server.ApplicationMessageReceivedHandler = new MqttApplicationMessageReceivedHandlerDelegate(MessageReceived);

server.UseApplicationMessageReceivedHandler(c => MessageReceived(c));
static async Task MessageReceived(MqttApplicationMessageReceivedEventArgs e)
{
Console.WriteLine($"{e.ClientId} get {e.ApplicationMessage.Topic}");
}

3. 操作

发布消息

var message = new MqttApplicationMessage()
{
Topic = "testTopic",
Payload = Encoding.UTF8.GetBytes("hello seven")
};
server.PublishAsync(message);

查询客户端状态

var list = server.GetClientStatusAsync().Result;

获取会话信息

var sessions = server.GetSessionStatusAsync().Result;

查询Retain的消息

var messages = server.GetRetainedApplicationMessagesAsync().Result;

清空Retain消息

server.ClearRetainedApplicationMessagesAsync();

停止服务

server.StopAsync();

4. 其他

自带的日志跟踪

var logger = new MqttNetLogger();
logger.LogMessagePublished += LogMessagePublished;
private static void LogMessagePublished(object sender, MqttNetLogMessagePublishedEventArgs e)
{
Console.WriteLine(e.LogMessage);
Console.WriteLine(e.TraceMessage);
}

二. 客户端

1. 创建配置参数

可以使用 `var options = new MqttClientOptions();` 直接构建一个options。你也可以通过参数构建器 `var options = new MqttClientOptionsBuilder();` 使代码更简洁美观。

构建器的函数说明：

函数名	功能说明
Build	构建配置参数
WithAuthentication	允许使用不同的身份验证模式
WithCleanSession	将客户端与MQTT干净会话支持一起使用
WithClientId	设置客户端ID
WithCommunicationTimeout	设置通信超时
WithCredentials	设置登录凭证
WithExtendedAuthenticationExchangeHandler	以自定义方式处理身份验证
WithKeepAlivePeriod	设置保持有效期
WithKeepAliveSendInterval	设置保活的发送间隔
WithMaximumPacketSize	设置最大数据包大小
WithNoKeepAlive	不要使用保持活动状态
WithProtocolVersion	设置MQTT协议版本
WithProxy	设置代理
WithTls	客户端使用SSL/TLS
WithTopicAliasMaximum	允许最大数量的主题别名
WithReceiveMaximum	允许最大数量的已接收数据包
WithRequestProblemInformation	显示请求问题信息
WithRequestResponseInformation	显示请求响应问题信息
WithSessionExpiryInterval	一段时间后终止会话
WithTcpServer	告诉客户端（通过TCP）连接到哪个MQTT代理。
WithWebSocketServer	告诉客户端（通过WebSocket）连接到哪个MQTT代理
WithWillMessage	告诉客户端最后一条消息将被发送。
WithWillDelayInterval	告诉客户端最后一个消息得延迟间隔

2. 连接服务端

var client = new MqttFactory().CreateMqttClient();
client.ConnectAsync(options.Build());

客户端连接完成事件

client.UseConnectedHandler(e => Connected(e));
static async Task Connected(MqttClientConnectedEventArgs e)
{
Console.WriteLine($"Connected");
}

客户端断开事件

client.UseDisconnectedHandler(e => Disconnected(e));
static async Task Disconnected(MqttClientDisconnectedEventArgs e)
{
Console.WriteLine($"Disconnected");
}

订阅主题(必须在成功连接以后才生效)

client.UseApplicationMessageReceivedHandler(e => MessageReceived(e));
static async Task MessageReceived(MqttApplicationMessageReceivedEventArgs e)
{
Console.WriteLine($"{e.ClientId}");
}

发布消息( 必须在成功连接以后才生效 )

var message = new MqttApplicationMessageBuilder()
.WithTopic("myTopic")
.WithPayload("seven365.cn")
.WithExactlyOnceQoS()
.WithRetainFlag()
.Build();
client.PublishAsync(message, CancellationToken.None);

3. 操作

客户端重连

client.ReconnectAsync();

客户端断开

client.DisconnectAsync