MqttNet基本示例

Question

我必须创建一个非常基本的Mqtt演示，因此我遵循并下载了这示例。

它工作得很完美，但它是一个带有Net5.0的控制台应用程序。

我必须让它在wpf 4.5.2上工作。解决方案。根据这个，这是可能的。

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因此，以上面的解决方案为例

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我创建了一个具有相同参考性的项目。

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对于每个项目，我还添加了正确的使用语句，如示例中所示。

所以一切都应该是正确的，但是当我粘贴服务器的代码时，我会得到这些错误

MqttServerOptionsBuilder options = new MqttServerOptionsBuilder()
           .WithDefaultEndpoint()
           .WithDefaultEndpointPort(707)
           .WithConnectionValidator(OnNewConnection)
           .WithApplicationMessageInterceptor(OnNewMessage);


        IMqttServer mqttServer = new MqttFactory().CreateMqttServer();

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此外，对于客户端，我还会得到其他错误。

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问题出在哪里？谢谢

-加

按照要求，这里是错误

(1) Error   CS1061  'IManagedMqttClient' does not contain a definition for 'ConnectedHandler' and no accessible extension method 'ConnectedHandler' accepting a first argument of type 'IManagedMqttClient' could be found (are you missing a using directive or an assembly reference?)    Client  C:\Development\MqttDemo\MqttDemo\Client\MainWindow.xaml.cs  43  25  IntelliSense    Active

(2) Error   CS0246  The type or namespace name 'MqttClientConnectedHandlerDelegate' could not be found (are you missing a using directive or an assembly reference?)    Client  C:\Development\MqttDemo\MqttDemo\Client\MainWindow.xaml.cs  43  48  IntelliSense    Active

(3) Error   CS0103  The name 'OnConnected' does not exist in the current context    Client  C:\Development\MqttDemo\MqttDemo\Client\MainWindow.xaml.cs  43  83  IntelliSense    Active

(4) Error   CS1061  'IManagedMqttClient' does not contain a definition for 'DisconnectedHandler' and no accessible extension method 'DisconnectedHandler' accepting a first argument of type 'IManagedMqttClient' could be found (are you missing a using directive or an assembly reference?)  Client  C:\Development\MqttDemo\MqttDemo\Client\MainWindow.xaml.cs  44  25  IntelliSense    Active

(5) Error   CS0246  The type or namespace name 'MqttClientDisconnectedHandlerDelegate' could not be found (are you missing a using directive or an assembly reference?) Client  C:\Development\MqttDemo\MqttDemo\Client\MainWindow.xaml.cs  44  51  IntelliSense    Active

(6) Error   CS0103  The name 'OnDisconnected' does not exist in the current context Client  C:\Development\MqttDemo\MqttDemo\Client\MainWindow.xaml.cs  44  89  IntelliSense    Active

(7) Error   CS1061  'IManagedMqttClient' does not contain a definition for 'ConnectingFailedHandler' and no accessible extension method 'ConnectingFailedHandler' accepting a first argument of type 'IManagedMqttClient' could be found (are you missing a using directive or an assembly reference?)  Client  C:\Development\MqttDemo\MqttDemo\Client\MainWindow.xaml.cs  45  25  IntelliSense    Active

(8) Error   CS0246  The type or namespace name 'ConnectingFailedHandlerDelegate' could not be found (are you missing a using directive or an assembly reference?)   Client  C:\Development\MqttDemo\MqttDemo\Client\MainWindow.xaml.cs  45  55  IntelliSense    Active

(9) Error   CS0103  The name 'OnConnectingFailed' does not exist in the current context Client  C:\Development\MqttDemo\MqttDemo\Client\MainWindow.xaml.cs  45  87  IntelliSense    Active

(10) Error  CS1061  'IManagedMqttClient' does not contain a definition for 'ApplicationMessageReceivedHandler' and no accessible extension method 'ApplicationMessageReceivedHandler' accepting a first argument of type 'IManagedMqttClient' could be found (are you missing a using directive or an assembly reference?)  Client  C:\Development\MqttDemo\MqttDemo\Client\MainWindow.xaml.cs  47  25  IntelliSense    Active

(11) Error  CS0246  The type or namespace name 'MqttApplicationMessageReceivedHandlerDelegate' could not be found (are you missing a using directive or an assembly reference?) Client  C:\Development\MqttDemo\MqttDemo\Client\MainWindow.xaml.cs  47  65  IntelliSense    Active

(12) Error  CS1061  'IManagedMqttClient' does not contain a definition for 'PublishAsync' and no accessible extension method 'PublishAsync' accepting a first argument of type 'IManagedMqttClient' could be found (are you missing a using directive or an assembly reference?)    Client  C:\Development\MqttDemo\MqttDemo\Client\MainWindow.xaml.cs  56  29  IntelliSense    Active

Answer 1

MQTT正在迅速成为物联网部署的主要协议之一。

MQTT有两个不同的变体和几个版本。

MQTT v3.1.0 -

MQTT v3.1.1 -常用

MQTT v5 -目前限制使用

MQTT-SN -见后面的说明

下面的示例使用版本3.0.16。MQTT v3.1.1是常用的版本。v3.10和3.1.1之间的差别很小。所以降低你的MQTT级别来解决这个问题。

Install-Package MQTTnet -Version 3.0.16

客户端：

Install-Package MQTTnet.Extensions.ManagedClient -Version 3.0.16

参考文献：link1，link2，link3，link4

Answer 2

您试图在旧版本3.1.x示例中使用MQTTNet新版本4.0.1.184。

如果您想使用最新的MQTTNet (4.x)版本，那么使用最新的示例。就像他们的github页面上的那个- Samples.cs

MQTTNet (客户端)版本与MQTT (协议)版本无关，而且据了解它们是可互操作的。例如，MQTT 3.1.1可以与MQTTNet 4.x客户端一起使用。