public static IMqttRpcClient CreateMqttRpcClient(this MqttFactory factory, IMqttClient mqttClient)
{
return(factory.CreateMqttRpcClient(mqttClient, new MqttRpcClientOptions
{
TopicGenerationStrategy = new DefaultMqttRpcClientTopicGenerationStrategy()
}));
}
/*
* The extension MQTTnet.Extensions.Rpc (available as nuget) allows sending a request and waiting for the matching reply.
* This is done via defining a pattern which uses the topic to correlate the request and the response.
* From client usage it is possible to define a timeout.
*/
public static async Task Send_Request()
{
var mqttFactory = new MqttFactory();
// The RPC client is an addon for the existing client. So we need a regular client
// which is wrapped later.
using (var mqttClient = mqttFactory.CreateMqttClient())
{
var mqttClientOptions = new MqttClientOptionsBuilder()
.WithTcpServer("broker.hivemq.com")
.Build();
await mqttClient.ConnectAsync(mqttClientOptions);
using (var mqttRpcClient = mqttFactory.CreateMqttRpcClient(mqttClient))
{
// Access to a fully featured application message is not supported for RCP calls!
// The method will throw an exception when the response was not received in time.
await mqttRpcClient.ExecuteAsync(TimeSpan.FromSeconds(2), "ping", "", MqttQualityOfServiceLevel.AtMostOnce);
}
Console.WriteLine("The RPC call was successful.");
}
}