MqttNet 基本示例

Question

我必须创建一个非常基本的 Mqtt 代理客户端演示，因此我遵循并下载了这个示例。

它工作得很好，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。按照这个应该是可以的

以上面的解决方案为例

我使用相同的参考创建了自己的项目

对于每个项目，我还添加了正确的 using 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，我收到了这些错误

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


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

对于客户我也遇到其他错误

哪里有问题？谢谢

- -添加 - -

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 IOT（物联网）部署的主要协议之一。

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MQTT 有两种不同的变体和多个版本。\n
MQTT v3.1.0 \xe2\x80\x93\n
MQTT v3.1.1 \xe2\x80\x93 常用\n
MQTT v5 \xe2\x80\x93 目前限制使用\n
MQTT-SN \xe2\x80\ x93 参见稍后的注释

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您遵循的示例使用版本3.0.16。MQTT v3.1.1 是常用版本。v3.10 和 3.1.1 之间差别很小。所以降级你的MQTT来解决这个问题。

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Install-Package MQTTnet -Version 3.0.16\n

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客户：

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Install-Package MQTTnet.Extensions.ManagedClient -Version 3.0.16\n

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参考：链接1、链接2、链接3、链接4

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