v4.0.0 (#1357)

2026-10-17 01:33:03 +08:00 · 2022-02-20 21:10:46 +01:00
parent 47e674e4d3
commit 2ce9b94ec9
608 changed files with 22364 additions and 19420 deletions
@@ -0,0 +1,80 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using MQTTnet.Client;
+using MQTTnet.Samples.Helpers;
+
+namespace MQTTnet.Samples.Client;
+
+public static class Client_Subscribe_Samples
+{
+    public static async Task Handle_Received_Application_Message()
+    {
+        /*
+         * This sample subscribes to a topic and processes the received message.
+         */
+
+        var mqttFactory = new MqttFactory();
+
+        using (var mqttClient = mqttFactory.CreateMqttClient())
+        {
+            var mqttClientOptions = new MqttClientOptionsBuilder()
+                .WithTcpServer("broker.hivemq.com")
+                .Build();
+
+            // Setup message handling before connecting so that queued messages
+            // are also handled properly. When there is no event handler attached all
+            // received messages get lost.
+            mqttClient.ApplicationMessageReceivedAsync += e =>
+            {
+                Console.WriteLine("Received application message.");
+                e.DumpToConsole();
+
+                return Task.CompletedTask;
+            };
+
+            await mqttClient.ConnectAsync(mqttClientOptions, CancellationToken.None);
+
+            var mqttSubscribeOptions = mqttFactory.CreateSubscribeOptionsBuilder()
+                .WithTopicFilter(f => { f.WithTopic("mqttnet/samples/topic/2"); })
+                .Build();
+
+            await mqttClient.SubscribeAsync(mqttSubscribeOptions, CancellationToken.None);
+
+            Console.WriteLine("MQTT client subscribed to topic.");
+
+            Console.WriteLine("Press enter to exit.");
+            Console.ReadLine();
+        }
+    }
+
+    public static async Task Subscribe_Topic()
+    {
+        /*
+         * This sample subscribes to a topic.
+         */
+
+        var mqttFactory = new MqttFactory();
+
+        using (var mqttClient = mqttFactory.CreateMqttClient())
+        {
+            var mqttClientOptions = new MqttClientOptionsBuilder()
+                .WithTcpServer("broker.hivemq.com")
+                .Build();
+
+            await mqttClient.ConnectAsync(mqttClientOptions, CancellationToken.None);
+
+            var mqttSubscribeOptions = mqttFactory.CreateSubscribeOptionsBuilder()
+                .WithTopicFilter(f => { f.WithTopic("mqttnet/samples/topic/1"); })
+                .Build();
+
+            var response = await mqttClient.SubscribeAsync(mqttSubscribeOptions, CancellationToken.None);
+
+            Console.WriteLine("MQTT client subscribed to topic.");
+
+            // The response contains additional data sent by the server after subscribing.
+            response.DumpToConsole();
+        }
+    }
+}