public void MultiTopic()
{
// double topic unsubscribe
var expected = new[]
{
(byte)0xA2,
(byte)0x0E,
(byte)0x00,
(byte)0x03,
(byte)0x00,
(byte)0x04,
(byte)'f',
(byte)'r',
(byte)'e',
(byte)'d',
(byte)0x00,
(byte)0x04,
(byte)'m',
(byte)'a',
(byte)'r',
(byte)'k',
};
MqttMessage msg = new MqttUnsubscribeMessage()
.FromTopic("fred")
.FromTopic("mark")
.WithMessageIdentifier(3)
.ExpectAcknowledgement();
Console.WriteLine(msg);
byte[] actual = MessageSerializationHelper.GetMessageBytes(msg);
Assert.Equal<int>(expected.Length, actual.Length);
Assert.Equal<byte>(expected[0], actual[0]); // msg type of header
Assert.Equal<byte>(expected[1], actual[1]); // remaining length
Assert.Equal<byte>(expected[2], actual[2]); // Start of VH: MsgID Byte1
Assert.Equal<byte>(expected[3], actual[3]); // MsgID Byte 2
Assert.Equal<byte>(expected[4], actual[4]); // Topic Length B1
Assert.Equal<byte>(expected[5], actual[5]); // Topic Length B2
Assert.Equal<byte>(expected[6], actual[6]); // f
Assert.Equal<byte>(expected[7], actual[7]); // r
Assert.Equal<byte>(expected[8], actual[8]); // e
Assert.Equal<byte>(expected[9], actual[9]); // d
Assert.Equal<byte>(expected[10], actual[10]); // Topic Length B1
Assert.Equal<byte>(expected[11], actual[11]); // Topic Length B2
Assert.Equal<byte>(expected[12], actual[12]); // f
Assert.Equal<byte>(expected[13], actual[13]); // r
Assert.Equal<byte>(expected[14], actual[14]); // e
Assert.Equal<byte>(expected[15], actual[15]); // d
}
public void ClearSubscriptions()
{
MqttUnsubscribeMessage msg = new MqttUnsubscribeMessage()
.FromTopic("fred")
.FromTopic("mark")
.WithMessageIdentifier(3)
.ExpectAcknowledgement();
Console.WriteLine(msg);
Assert.Equal<int>(2, msg.Payload.Subscriptions.Count);
msg.Payload.ClearSubscriptions();
Assert.Equal<int>(0, msg.Payload.Subscriptions.Count);
}
/// <summary>
/// Creates an observable for a subscription.
/// </summary>
/// <param name="subscriptionTopic">The topic to the obserbable should read messages on.</param>
/// <param name="msgId">The messgeid assigned to the subscription.</param>
/// <returns>An observable that yields a byte array for each message that arrives on a topoc.</returns>
private IObservable <MqttReceivedMessage <byte[]> > CreateObservableForSubscription(SubscriptionTopic subscriptionTopic, short msgId)
{
var observable = Observable.Create <MqttReceivedMessage <byte[]> >(observer => {
Log.Info(m => m("Creating underlying core observable for topoc {0}.", subscriptionTopic));
// Listen for payload messages and when they arrive for our topoc
// publish them onto the observable.
var msgPubObservable
= Observable.FromEventPattern <PublishEventArgs>(h => publishingManager.MessageReceived += h,
h => publishingManager.MessageReceived -= h);
var msgPubSub = msgPubObservable
.Where(ep => subscriptionTopic.Matches(ep.EventArgs.Topic))
.Select(ep => ep.EventArgs)
.Subscribe(eventArgs => {
try {
// we use the messages topic name here so that if the
// matched subscription was a wildcard, we give the
// consumer the actual topic the message was published
// for, not the original wildcard subscription topic.
observer.OnNext(new MqttReceivedMessage <byte[]>(eventArgs.Topic.ToString(),
eventArgs.PublishMessage.Payload.Message.ToArray()));
} catch (Exception ex) {
Log.Error(m => m("Error while publishing message to observer for topic {0}.", eventArgs.Topic.ToString()), ex);
}
});
// Unsubscribe from the topoc on the server,
return(Disposable.Create(() => {
Log.Info(m => m("Last subscriber gone for topic '{0}', unsubscribing on broker.", subscriptionTopic));
// stop processing publish messages for this topoc received by thethe publishing manager.
msgPubSub.Dispose();
// build a unsubscribe message for the caller and send it off to the broker.
var unsubscribeMsg = new MqttUnsubscribeMessage()
.WithMessageIdentifier(messageIdentifierDispenser.GetNextMessageIdentifier("unsubscriptions"))
.WithMessageIdentifier(msgId)
.FromTopic(subscriptionTopic.ToString());
connectionHandler.SendMessage(unsubscribeMsg);
}));
});
// Publish and refcount so we can share the single subscription amongst all
// subscribers and dispose automatically when everyone has disposed their
// subscriptions.
return(observable.Publish()
.RefCount());
}
/// <summary>
/// Creates an observable for a subscription.
/// </summary>
/// <param name="topic">The topic to create the observable for.</param>
/// <param name="msgId">The messgeid assigned to the subscription</param>
/// <returns>An observable that yields a byte array for each message that arrives on a topic.</returns>
private IObservable <byte[]> CreateObservableForSubscription(string topic, short msgId)
{
var observable = Observable.Create((IObserver <byte[]> observer) => {
Log.Info(m => m("Creating underlying core observable for topic {0}.", topic));
// Listen for payload messages and when they arrive for our topic
// publish them onto the observable.
var msgPubObservable
= Observable.FromEventPattern <PublishEventArgs>(h => publishingManager.MessageReceived += h,
h => publishingManager.MessageReceived -= h);
var msgPubSub = msgPubObservable
.Where(ep => topic.Equals(ep.EventArgs.PublishMessage.VariableHeader.TopicName))
.Select(ep => ep.EventArgs.PublishMessage)
.Subscribe(msg => {
try {
observer.OnNext(msg.Payload.Message.ToArray());
} catch (Exception ex) {
Log.Error(m => m("Error while publishing message to observer for topic {0}.", topic), ex);
}
});
// Unsubscribe from the topic on the server,
return(Disposable.Create(() => {
Log.Info(m => m("Last subscriber gone for topic '{0}', unsubscribing on broker.", topic));
// stop processing publish messages for this topic received by thethe publishing manager.
msgPubSub.Dispose();
// build a unsubscribe message for the caller and send it off to the broker.
var unsubscribeMsg = new MqttUnsubscribeMessage().WithMessageIdentifier(
messageIdentifierDispenser.GetNextMessageIdentifier("unsubscriptions"))
.WithMessageIdentifier(msgId)
.FromTopic(topic);
connectionHandler.SendMessage(unsubscribeMsg);
}));
});
// Publish and refcount so we can share the single subscription amongst all
// subscribers and dispose automatically when everyone has disposed their
// subscriptions.
return(observable.Publish()
.RefCount());
}
