public void QosLevel2ExactlyOnce()
{
// expected response
var expected = new[]
{
(byte)0x34,
(byte)0x0E,
(byte)0x0,
(byte)0x4,
(byte)'f',
(byte)'r',
(byte)'e',
(byte)'d',
(byte)0x0,
(byte)0x0A,
// message payload is here
(byte)'h',
(byte)'e',
(byte)'l',
(byte)'l',
(byte)'o',
(byte)'!',
};
MqttMessage msg = new MqttPublishMessage()
.WithQos(MqttQos.ExactlyOnce)
.WithMessageIdentifier(10)
.ToTopic("fred")
.PublishData(new[]
{
(byte)'h',
(byte)'e',
(byte)'l',
(byte)'l',
(byte)'o',
(byte)'!',
}
);
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 + other bits
Assert.Equal<byte>(expected[1], actual[1]); // remaining length
Assert.Equal<byte>(expected[2], actual[2]); // first topic length byte
Assert.Equal<byte>(expected[3], actual[3]); // second topic length byte
Assert.Equal<byte>(expected[4], actual[4]); // f
Assert.Equal<byte>(expected[5], actual[5]); // r
Assert.Equal<byte>(expected[6], actual[6]); // e
Assert.Equal<byte>(expected[7], actual[7]); // d
Assert.Equal<byte>(expected[8], actual[8]); // h
Assert.Equal<byte>(expected[9], actual[9]); // e
Assert.Equal<byte>(expected[10], actual[10]); // l
Assert.Equal<byte>(expected[11], actual[11]); // l
Assert.Equal<byte>(expected[12], actual[12]); // o
Assert.Equal<byte>(expected[13], actual[13]); // !
}
/// <summary>
/// Raises the MessageReceived event.
/// </summary>
/// <param name="topic">The topic the message belongs to.</param>
/// <param name="msg">The message received.</param>
private void OnMessageReceived(PublicationTopic topic, MqttPublishMessage msg)
{
var handler = MessageReceived;
if (handler != null)
{
handler(this, new PublishEventArgs(topic, msg));
}
}
public void ClearPublishData()
{
// set up some publish data
MqttPublishMessage msg = new MqttPublishMessage()
.PublishData(new[] { (byte)0, (byte)1 });
Assert.Equal<int>(2, msg.Payload.Message.Count);
msg.ClearPublishData();
Assert.Equal<int>(0, msg.Payload.Message.Count);
}
/// <summary>
/// Handles the processing of messages arriving from the message broker.
/// </summary>
/// <param name="mqttMessage"></param>
private bool HandlePublishMessage(MqttMessage message)
{
MqttPublishMessage pubMsg = (MqttPublishMessage)message;
Subscription subs = subscriptionsManager.GetSubscription(pubMsg.VariableHeader.TopicName);
if (subs == null)
{
return(false);
}
// pass it on to the event subscribers.
OnMessageAvailable(pubMsg.VariableHeader.TopicName, subs.DataProcessor.ConvertFromBytes(pubMsg.Payload.Message.ToArray()));
return(true);
}
/// <summary>
/// Handles the receipt of publish messages from a message broker.
/// </summary>
/// <param name="msg">The message that was published.</param>
/// <returns></returns>
private bool HandlePublish(MqttMessage msg)
{
MqttPublishMessage pubMsg = (MqttPublishMessage)msg;
bool publishSuccess = false;
if (pubMsg.Header.Qos == MqttQos.AtMostOnce)
{
// QOS AtMostOnce 0 require no response.
// send the message for processing to whoever is waiting.
publishSuccess = publishMessageCallback(pubMsg);
}
else if (pubMsg.Header.Qos == MqttQos.AtLeastOnce)
{
// QOS AtLeastOnce 1 require an acknowledgement
// send the message for processing to whoever is waiting.
publishSuccess = publishMessageCallback(pubMsg);
MqttPublishAckMessage ackMsg = new MqttPublishAckMessage()
.WithMessageIdentifier(pubMsg.VariableHeader.MessageIdentifier);
connectionHandler.SendMessage(ackMsg);
}
else if (pubMsg.Header.Qos == MqttQos.ExactlyOnce)
{
// QOS ExactlyOnce means we can't give it away yet, we gotta do a handshake
// to make sure the broker knows we got it, and we know he knows we got it.
// if we've already got it thats ok, it just means its being republished because
// of a handshake breakdown, overwrite our existing one for the sake of it
if (!receivedMessages.ContainsKey(pubMsg.VariableHeader.MessageIdentifier))
{
receivedMessages[pubMsg.VariableHeader.MessageIdentifier] = pubMsg;
}
MqttPublishReceivedMessage pubRecv = new MqttPublishReceivedMessage()
.WithMessageIdentifier(pubMsg.VariableHeader.MessageIdentifier);
connectionHandler.SendMessage(pubRecv);
publishSuccess = true;
}
return(publishSuccess);
}
/// <summary>
/// Publish a message to the broker on the specified topic.
/// </summary>
/// <param name="topic">The topic to send the message to.</param>
/// <param name="qualityOfService">The QOS to use when publishing the message.</param>
/// <param name="data">The message to send.</param>
/// <returns>The message identifier assigned to the message.</returns>
public short Publish<T, TPayloadConverter>(string topic, MqttQos qualityOfService, T data)
where TPayloadConverter : IPayloadConverter<T>, new() {
var msgId = messageIdentifierDispenser.GetNextMessageIdentifier(String.Format("Topic:{0}", topic));
Log.DebugFormat("Publishing message ID {0} on topic {1} using QOS {2}", msgId, topic, qualityOfService);
var converter = GetPayloadConverter<TPayloadConverter>();
var msg = new MqttPublishMessage()
.ToTopic(topic)
.WithMessageIdentifier(msgId)
.WithQos(qualityOfService)
.PublishData(converter.ConvertToBytes(data));
// QOS level 1 or 2 messages need to be saved so we can do the ack processes
if (qualityOfService == MqttQos.AtLeastOnce || qualityOfService == MqttQos.ExactlyOnce) {
publishedMessages.Add(msgId, msg);
}
connectionHandler.SendMessage(msg);
return msgId;
}
/// <summary>
/// Publish a message to the broker on the specified topic.
/// </summary>
/// <param name="topic">The topic to send the message to.</param>
/// <param name="payload">The message to send.</param>
/// <returns>The message identifier assigned to the message.</returns>
public short Publish <TDataConverter>(string topic, MqttQos qualityOfService, object data)
where TDataConverter : IPublishDataConverter
{
short msgID = MessageIdentifierDispenser.GetNextMessageIdentifier(String.Format("Topic:{0}", topic));
IPublishDataConverter converter = GetPublishDataConverter <TDataConverter>();
MqttPublishMessage msg = new MqttPublishMessage()
.ToTopic(topic)
.WithMessageIdentifier(msgID)
.WithQos(qualityOfService)
.PublishData(converter.ConvertToBytes(data));
// QOS level 1 or 2 messages need to be saved so we can do the ack processes
if (qualityOfService == MqttQos.AtLeastOnce || qualityOfService == MqttQos.ExactlyOnce)
{
publishedMessages.Add(msgID, msg);
}
connectionHandler.SendMessage(msg);
return(msgID);
}
/// <summary>
/// Creates a new instance of a PublishEventArgs class.
/// </summary>
/// <param name="publishMessage">The MQTT Publish Message that's been published.</param>
public PublishEventArgs(MqttPublishMessage publishMessage)
{
PublishMessage = publishMessage;
}
public void WithNonDefaultQos()
{
// set up some publish data
MqttPublishMessage msg = new MqttPublishMessage()
.ToTopic("mark")
.WithQos(MqttQos.AtLeastOnce)
.WithMessageIdentifier(4)
.PublishData(new[] { (byte)9 });
var msgBytes = MessageSerializationHelper.GetMessageBytes(msg);
// 2 (header + 6 (topic) + 2 (msg id) + 1 (data size)
Assert.Equal<int>(11, msgBytes.Length);
}
/// <summary>
/// Creates a new instance of a PublishEventArgs class.
/// </summary>
/// <param name="topic">The parsed topic.</param>
/// <param name="publishMessage">The MQTT Publish Message that's been published.</param>
public PublishEventArgs(PublicationTopic topic, MqttPublishMessage publishMessage)
{
Topic = topic;
PublishMessage = publishMessage;
}
/// <summary>
/// Creates a new instance of a PublishEventArgs class.
/// </summary>
/// <param name="topic">The parsed topic.</param>
/// <param name="publishMessage">The MQTT Publish Message that's been published.</param>
public PublishEventArgs(PublicationTopic topic, MqttPublishMessage publishMessage) {
Topic = topic;
PublishMessage = publishMessage;
}
/// <summary>
/// Raises the MessageReceived event.
/// </summary>
/// <param name="msg">The message received.</param>
private void OnMessageReceived(MqttPublishMessage msg) {
var handler = MessageReceived;
if (handler != null) {
handler(this, new PublishEventArgs(msg));
}
}