使用MQTTnet开发MQTT服务-.NET Framework版本

        前面使用的RabbitMQ 的MQTT服务，但我们使用MQTTnet 也是可以自己开发出一个服务端的

GitHub - harrylsp/MQTTServer: MQTTServerMQTTServer. Contribute to harrylsp/MQTTServer development by creating an account on GitHub.https://github.com/harrylsp/MQTTServer

public MqttServer mqttServer = null;
mqttServer = new MqttFactory().CreateMqttServer() as MqttServer;

var optionsBuilder = new MqttServerOptionsBuilder()
.WithDefaultEndpoint().WithDefaultEndpointPort(1883).WithConnectionValidator(c =>
{
	var currentUser = username;
	var currentPwd = password;

	if (currentUser == null || currentPwd == null)
	{
		c.ReasonCode = MqttConnectReasonCode.BadUserNameOrPassword;
		return;
	}

	if (c.Username != currentUser || c.Password != currentPwd)
	{
		c.ReasonCode = MqttConnectReasonCode.BadUserNameOrPassword;
	}

	c.ReasonCode = MqttConnectReasonCode.Success;
})
.WithSubscriptionInterceptor(c =>
{
	c.AcceptSubscription = true;
})
.WithApplicationMessageInterceptor(c =>
{
	c.AcceptPublish = true;
});

mqttServer.StartedHandler = new MqttServerStartedHandlerDelegate(new Action(e =>
{
	if (mqttServer.IsStarted)
	{ }
	LogManager.WriteLogEx(LOGLEVEL.INFO, "MQTT服务启动完成！");
}));

mqttServer.StoppedHandler = new MqttServerStoppedHandlerDelegate(new Action(e =>
{
	if (!mqttServer.IsStarted)
	{ }

	LogManager.WriteLogEx(LOGLEVEL.INFO, "MQTT服务停止完成！");
}));

mqttServer.ClientConnectedHandler = new MqttServerClientConnectedHandlerDelegate(new Action(e =>
{
	LogManager.WriteLogEx(LOGLEVEL.INFO, $"客户端[{e.ClientId}]已连接");
}));

mqttServer.ClientDisconnectedHandler = new MqttServerClientDisconnectedHandlerDelegate(new Action(e =>
{
	LogManager.WriteLogEx(LOGLEVEL.INFO, $"客户端[{e.ClientId}]已断开连接！");
}));

mqttServer.ClientSubscribedTopicHandler = new MqttServerClientSubscribedTopicHandlerDelegate(new Action(e =>
{
	LogManager.WriteLogEx(LOGLEVEL.INFO, $"客户端[{e.ClientId}]已成功订阅主题[{e.TopicFilter}]！");
}));

mqttServer.ClientUnsubscribedTopicHandler = new MqttServerClientUnsubscribedTopicHandlerDelegate(new Action(e =>
{
	LogManager.WriteLogEx(LOGLEVEL.INFO, $"客户端[{e.ClientId}]已成功取消订阅主题[{e.TopicFilter}]！");
}));

mqttServer.ApplicationMessageReceivedHandler = new MqttApplicationMessageReceivedHandlerDelegate(new Action(e =>
{
	LogManager.WriteLogEx(LOGLEVEL.INFO, $"客户端[{e.ClientId}]>> 主题：{e.ApplicationMessage.Topic} 负荷：{Encoding.UTF8.GetString(e.ApplicationMessage.Payload)} Qos：{e.ApplicationMessage.QualityOfServiceLevel} 保留：{e.ApplicationMessage.Retain}");
}));

await mqttServer.StartAsync(optionsBuilder.Build());

var message = new MqttApplicationMessage()
{
	Topic = topic,
	Payload = Encoding.UTF8.GetBytes(payload)
};

await mqttServer.PublishAsync(message);

源代码：GitHub - harrylsp/MQTTServer: MQTTServer

更专业的MQTT服务 EMQX

https://www.emqx.com/zh/downloads-and-install?product=broker&version=4.3.10&os=Windows&oslabel=Windows