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+/*
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+Copyright (c) 2013, 2014 Paolo Patierno
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+
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+All rights reserved. This program and the accompanying materials
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+are made available under the terms of the Eclipse Public License v1.0
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+and Eclipse Distribution License v1.0 which accompany this distribution.
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+
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+The Eclipse Public License is available at
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+ http://www.eclipse.org/legal/epl-v10.html
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+and the Eclipse Distribution License is available at
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+ http://www.eclipse.org/org/documents/edl-v10.php.
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+
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+Contributors:
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+ Paolo Patierno - initial API and implementation and/or initial documentation
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+*/
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+
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+using System;
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+using System.Net;
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+#if !(WINDOWS_APP || WINDOWS_PHONE_APP)
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+using System.Net.Sockets;
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+using System.Security.Cryptography.X509Certificates;
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+#endif
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+using System.Threading;
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+using uPLibrary.Networking.M2Mqtt.Exceptions;
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+using uPLibrary.Networking.M2Mqtt.Messages;
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+using uPLibrary.Networking.M2Mqtt.Session;
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+using uPLibrary.Networking.M2Mqtt.Utility;
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+using uPLibrary.Networking.M2Mqtt.Internal;
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+// if .Net Micro Framework
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+#if (MF_FRAMEWORK_VERSION_V4_2 || MF_FRAMEWORK_VERSION_V4_3)
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+using Microsoft.SPOT;
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+#if SSL
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+using Microsoft.SPOT.Net.Security;
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+#endif
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+// else other frameworks (.Net, .Net Compact, Mono, Windows Phone)
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+#else
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+using System.Collections.Generic;
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+#if (SSL && !(WINDOWS_APP || WINDOWS_PHONE_APP))
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+using System.Security.Authentication;
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+using System.Net.Security;
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+#endif
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+#endif
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+
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+#if (WINDOWS_APP || WINDOWS_PHONE_APP)
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+using Windows.Networking.Sockets;
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+#endif
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+
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+using System.Collections;
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+
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+// alias needed due to Microsoft.SPOT.Trace in .Net Micro Framework
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+// (it's ambiguos with uPLibrary.Networking.M2Mqtt.Utility.Trace)
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+using MqttUtility = uPLibrary.Networking.M2Mqtt.Utility;
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+
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+namespace uPLibrary.Networking.M2Mqtt
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+{
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+ /// <summary>
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+ /// MQTT Client
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+ /// </summary>
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+ public class MqttClient
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+ {
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+#if BROKER
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+ #region Constants ...
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+
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+ // thread names
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+ private const string RECEIVE_THREAD_NAME = "ReceiveThread";
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+ private const string RECEIVE_EVENT_THREAD_NAME = "DispatchEventThread";
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+ private const string PROCESS_INFLIGHT_THREAD_NAME = "ProcessInflightThread";
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+ private const string KEEP_ALIVE_THREAD = "KeepAliveThread";
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+
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+ #endregion
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+#endif
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+
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+ /// <summary>
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+ /// Delagate that defines event handler for PUBLISH message received
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+ /// </summary>
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+ public delegate void MqttMsgPublishEventHandler(object sender, MqttMsgPublishEventArgs e);
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+
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+ /// <summary>
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+ /// Delegate that defines event handler for published message
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+ /// </summary>
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+ public delegate void MqttMsgPublishedEventHandler(object sender, MqttMsgPublishedEventArgs e);
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+
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+ /// <summary>
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+ /// Delagate that defines event handler for subscribed topic
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+ /// </summary>
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+ public delegate void MqttMsgSubscribedEventHandler(object sender, MqttMsgSubscribedEventArgs e);
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+
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+ /// <summary>
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+ /// Delagate that defines event handler for unsubscribed topic
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+ /// </summary>
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+ public delegate void MqttMsgUnsubscribedEventHandler(object sender, MqttMsgUnsubscribedEventArgs e);
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+
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+#if BROKER
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+ /// <summary>
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+ /// Delagate that defines event handler for SUBSCRIBE message received
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+ /// </summary>
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+ public delegate void MqttMsgSubscribeEventHandler(object sender, MqttMsgSubscribeEventArgs e);
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+
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+ /// <summary>
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+ /// Delagate that defines event handler for UNSUBSCRIBE message received
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+ /// </summary>
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+ public delegate void MqttMsgUnsubscribeEventHandler(object sender, MqttMsgUnsubscribeEventArgs e);
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+
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+ /// <summary>
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+ /// Delagate that defines event handler for CONNECT message received
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+ /// </summary>
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+ public delegate void MqttMsgConnectEventHandler(object sender, MqttMsgConnectEventArgs e);
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+
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+ /// <summary>
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+ /// Delegate that defines event handler for client disconnection (DISCONNECT message or not)
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+ /// </summary>
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+ public delegate void MqttMsgDisconnectEventHandler(object sender, EventArgs e);
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+#endif
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+
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+ /// <summary>
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+ /// Delegate that defines event handler for cliet/peer disconnection
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+ /// </summary>
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+ public delegate void ConnectionClosedEventHandler(object sender, EventArgs e);
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+
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+ // broker hostname (or ip address) and port
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+ private string brokerHostName;
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+ private int brokerPort;
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+
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+ // running status of threads
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+ private bool isRunning;
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+ // event for raising received message event
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+ private AutoResetEvent receiveEventWaitHandle;
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+
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+ // event for starting process inflight queue asynchronously
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+ private AutoResetEvent inflightWaitHandle;
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+
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+ // event for signaling synchronous receive
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+ AutoResetEvent syncEndReceiving;
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+ // message received
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+ MqttMsgBase msgReceived;
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+
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+ // exeption thrown during receiving
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+ Exception exReceiving;
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+
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+ // keep alive period (in ms)
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+ private int keepAlivePeriod;
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+ // events for signaling on keep alive thread
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+ private AutoResetEvent keepAliveEvent;
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+ private AutoResetEvent keepAliveEventEnd;
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+ // last communication time in ticks
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+ private int lastCommTime;
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+
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+ // event for PUBLISH message received
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+ public event MqttMsgPublishEventHandler MqttMsgPublishReceived;
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+ // event for published message
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+ public event MqttMsgPublishedEventHandler MqttMsgPublished;
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+ // event for subscribed topic
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+ public event MqttMsgSubscribedEventHandler MqttMsgSubscribed;
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+ // event for unsubscribed topic
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+ public event MqttMsgUnsubscribedEventHandler MqttMsgUnsubscribed;
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+#if BROKER
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+ // event for SUBSCRIBE message received
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+ public event MqttMsgSubscribeEventHandler MqttMsgSubscribeReceived;
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+ // event for USUBSCRIBE message received
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+ public event MqttMsgUnsubscribeEventHandler MqttMsgUnsubscribeReceived;
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+ // event for CONNECT message received
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+ public event MqttMsgConnectEventHandler MqttMsgConnected;
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+ // event for DISCONNECT message received
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+ public event MqttMsgDisconnectEventHandler MqttMsgDisconnected;
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+#endif
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+
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+ // event for peer/client disconnection
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+ public event ConnectionClosedEventHandler ConnectionClosed;
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+
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+ // channel to communicate over the network
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+ private IMqttNetworkChannel channel;
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+
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+ // inflight messages queue
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+ private Queue inflightQueue;
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+ // internal queue for received messages about inflight messages
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+ private Queue internalQueue;
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+ // internal queue for dispatching events
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+ private Queue eventQueue;
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+ // session
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+ private MqttClientSession session;
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+
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+ // reference to avoid access to singleton via property
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+ private MqttSettings settings;
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+
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+ // current message identifier generated
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+ private ushort messageIdCounter = 0;
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+
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+ // connection is closing due to peer
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+ private bool isConnectionClosing;
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+
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+ /// <summary>
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+ /// Connection status between client and broker
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+ /// </summary>
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+ public bool IsConnected { get; private set; }
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+
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+ /// <summary>
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+ /// Client identifier
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+ /// </summary>
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+ public string ClientId { get; private set; }
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+
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+ /// <summary>
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+ /// Clean session flag
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+ /// </summary>
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+ public bool CleanSession { get; private set; }
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+
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+ /// <summary>
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+ /// Will flag
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+ /// </summary>
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+ public bool WillFlag { get; private set; }
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+
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+ /// <summary>
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+ /// Will QOS level
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+ /// </summary>
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+ public byte WillQosLevel { get; private set; }
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+
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+ /// <summary>
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+ /// Will topic
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+ /// </summary>
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+ public string WillTopic { get; private set; }
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+
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+ /// <summary>
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+ /// Will message
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+ /// </summary>
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+ public string WillMessage { get; private set; }
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+
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+ /// <summary>
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+ /// MQTT protocol version
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+ /// </summary>
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+ public MqttProtocolVersion ProtocolVersion { get; set; }
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+
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+#if BROKER
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+ /// <summary>
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+ /// MQTT Client Session
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+ /// </summary>
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+ public MqttClientSession Session
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+ {
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+ get { return this.session; }
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+ set { this.session = value; }
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+ }
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+#endif
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+
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+ /// <summary>
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+ /// MQTT client settings
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+ /// </summary>
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+ public MqttSettings Settings
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+ {
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+ get { return this.settings; }
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+ }
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+
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+#if !(WINDOWS_APP || WINDOWS_PHONE_APP)
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+ /// <summary>
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+ /// Constructor
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+ /// </summary>
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+ /// <param name="brokerIpAddress">Broker IP address</param>
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+ [Obsolete("Use this ctor MqttClient(string brokerHostName) insted")]
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+ public MqttClient(IPAddress brokerIpAddress) :
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+ this(brokerIpAddress, MqttSettings.MQTT_BROKER_DEFAULT_PORT, false, null, MqttSslProtocols.None)
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+ {
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+ }
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+
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+ /// <summary>
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+ /// Constructor
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+ /// </summary>
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+ /// <param name="brokerIpAddress">Broker IP address</param>
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+ /// <param name="brokerPort">Broker port</param>
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+ /// <param name="secure">Using secure connection</param>
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+ /// <param name="caCert">CA certificate for secure connection</param>
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+ /// <param name="sslProtocol">SSL/TLS protocol version</param>
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+ [Obsolete("Use this ctor MqttClient(string brokerHostName, int brokerPort, bool secure, X509Certificate caCert) insted")]
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+ public MqttClient(IPAddress brokerIpAddress, int brokerPort, bool secure, X509Certificate caCert, MqttSslProtocols sslProtocol)
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+ {
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+#if !(MF_FRAMEWORK_VERSION_V4_2 || MF_FRAMEWORK_VERSION_V4_3 || COMPACT_FRAMEWORK)
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+ this.Init(brokerIpAddress.ToString(), brokerPort, secure, caCert, sslProtocol, null, null);
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+#else
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+ this.Init(brokerIpAddress.ToString(), brokerPort, secure, caCert, sslProtocol);
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+#endif
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+ }
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+#endif
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+
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+ /// <summary>
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+ /// Constructor
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+ /// </summary>
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+ /// <param name="brokerHostName">Broker Host Name or IP Address</param>
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+ public MqttClient(string brokerHostName) :
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+#if !(WINDOWS_APP || WINDOWS_PHONE_APP)
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+ this(brokerHostName, MqttSettings.MQTT_BROKER_DEFAULT_PORT, false, null, MqttSslProtocols.None)
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+#else
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+ this(brokerHostName, MqttSettings.MQTT_BROKER_DEFAULT_PORT, false, MqttSslProtocols.None)
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+#endif
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+ {
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+ }
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+
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+ /// <summary>
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+ /// Constructor
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+ /// </summary>
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+ /// <param name="brokerHostName">Broker Host Name or IP Address</param>
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+ /// <param name="brokerPort">Broker port</param>
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+ /// <param name="secure">Using secure connection</param>
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+ /// <param name="sslProtocol">SSL/TLS protocol version</param>
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+#if !(WINDOWS_APP || WINDOWS_PHONE_APP)
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+ /// <param name="caCert">CA certificate for secure connection</param>
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+ public MqttClient(string brokerHostName, int brokerPort, bool secure, X509Certificate caCert, MqttSslProtocols sslProtocol)
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+#else
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+ public MqttClient(string brokerHostName, int brokerPort, bool secure, MqttSslProtocols sslProtocol)
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+#endif
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+ {
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+#if !(MF_FRAMEWORK_VERSION_V4_2 || MF_FRAMEWORK_VERSION_V4_3 || COMPACT_FRAMEWORK || WINDOWS_APP || WINDOWS_PHONE_APP)
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+ this.Init(brokerHostName, brokerPort, secure, caCert, sslProtocol, null, null);
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+#elif (WINDOWS_APP || WINDOWS_PHONE_APP)
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+ this.Init(brokerHostName, brokerPort, secure, sslProtocol);
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+#else
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+ this.Init(brokerHostName, brokerPort, secure, caCert, sslProtocol);
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+#endif
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+ }
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+
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+
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+#if !(MF_FRAMEWORK_VERSION_V4_2 || MF_FRAMEWORK_VERSION_V4_3 || COMPACT_FRAMEWORK || WINDOWS_APP || WINDOWS_PHONE_APP)
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+
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+ /// <summary>
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+ /// Constructor
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+ /// </summary>
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+ /// <param name="brokerHostName">Broker Host Name or IP Address</param>
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+ /// <param name="brokerPort">Broker port</param>
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+ /// <param name="secure">Using secure connection</param>
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+ /// <param name="caCert">CA certificate for secure connection</param>
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+ /// <param name="sslProtocol">SSL/TLS protocol version</param>
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+ /// <param name="userCertificateValidationCallback">A RemoteCertificateValidationCallback delegate responsible for validating the certificate supplied by the remote party</param>
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+ public MqttClient(string brokerHostName, int brokerPort, bool secure, X509Certificate caCert, MqttSslProtocols sslProtocol,
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+ RemoteCertificateValidationCallback userCertificateValidationCallback)
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+ : this(brokerHostName, brokerPort, secure, caCert, sslProtocol, userCertificateValidationCallback, null)
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+ {
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+ }
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+
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+ /// <summary>
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+ /// Constructor
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+ /// </summary>
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+ /// <param name="brokerHostName">Broker Host Name or IP Address</param>
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+ /// <param name="brokerPort">Broker port</param>
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+ /// <param name="secure">Using secure connection</param>
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+ /// <param name="sslProtocol">SSL/TLS protocol version</param>
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+ /// <param name="userCertificateValidationCallback">A RemoteCertificateValidationCallback delegate responsible for validating the certificate supplied by the remote party</param>
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+ /// <param name="userCertificateSelectionCallback">A LocalCertificateSelectionCallback delegate responsible for selecting the certificate used for authentication</param>
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+ public MqttClient(string brokerHostName, int brokerPort, bool secure, MqttSslProtocols sslProtocol,
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+ RemoteCertificateValidationCallback userCertificateValidationCallback,
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+ LocalCertificateSelectionCallback userCertificateSelectionCallback)
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+ : this(brokerHostName, brokerPort, secure, null, sslProtocol, userCertificateValidationCallback, userCertificateSelectionCallback)
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+ {
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+ }
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+
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+ /// <summary>
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+ /// Constructor
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+ /// </summary>
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+ /// <param name="brokerHostName">Broker Host Name or IP Address</param>
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+ /// <param name="brokerPort">Broker port</param>
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+ /// <param name="secure">Using secure connection</param>
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+ /// <param name="caCert">CA certificate for secure connection</param>
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+ /// <param name="sslProtocol">SSL/TLS protocol version</param>
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+ /// <param name="userCertificateValidationCallback">A RemoteCertificateValidationCallback delegate responsible for validating the certificate supplied by the remote party</param>
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+ /// <param name="userCertificateSelectionCallback">A LocalCertificateSelectionCallback delegate responsible for selecting the certificate used for authentication</param>
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+ public MqttClient(string brokerHostName, int brokerPort, bool secure, X509Certificate caCert, MqttSslProtocols sslProtocol,
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+ RemoteCertificateValidationCallback userCertificateValidationCallback,
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+ LocalCertificateSelectionCallback userCertificateSelectionCallback)
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+ {
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+ this.Init(brokerHostName, brokerPort, secure, caCert, sslProtocol, userCertificateValidationCallback, userCertificateSelectionCallback);
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+ }
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+#endif
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+
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+#if BROKER
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+ /// <summary>
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+ /// Constructor
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+ /// </summary>
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+ /// <param name="channel">Network channel for communication</param>
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+ public MqttClient(IMqttNetworkChannel channel)
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+ {
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+ // set default MQTT protocol version (default is 3.1.1)
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+ this.ProtocolVersion = MqttProtocolVersion.Version_3_1_1;
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+
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+ this.channel = channel;
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+
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+ // reference to MQTT settings
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+ this.settings = MqttSettings.Instance;
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+
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+ // client not connected yet (CONNACK not send from client), some default values
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+ this.IsConnected = false;
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+ this.ClientId = null;
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+ this.CleanSession = true;
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+
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+ this.keepAliveEvent = new AutoResetEvent(false);
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+
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+ // queue for handling inflight messages (publishing and acknowledge)
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+ this.inflightWaitHandle = new AutoResetEvent(false);
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+ this.inflightQueue = new Queue();
|
|
|
+
|
|
|
+ // queue for received message
|
|
|
+ this.receiveEventWaitHandle = new AutoResetEvent(false);
|
|
|
+ this.eventQueue = new Queue();
|
|
|
+ this.internalQueue = new Queue();
|
|
|
+
|
|
|
+ // session
|
|
|
+ this.session = null;
|
|
|
+ }
|
|
|
+#endif
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// MqttClient initialization
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="brokerHostName">Broker Host Name or IP Address</param>
|
|
|
+ /// <param name="brokerPort">Broker port</param>
|
|
|
+ /// <param name="secure">>Using secure connection</param>
|
|
|
+ /// <param name="caCert">CA certificate for secure connection</param>
|
|
|
+ /// <param name="sslProtocol">SSL/TLS protocol version</param>
|
|
|
+#if !(MF_FRAMEWORK_VERSION_V4_2 || MF_FRAMEWORK_VERSION_V4_3 || COMPACT_FRAMEWORK || WINDOWS_APP || WINDOWS_PHONE_APP)
|
|
|
+ /// <param name="userCertificateSelectionCallback">A RemoteCertificateValidationCallback delegate responsible for validating the certificate supplied by the remote party</param>
|
|
|
+ /// <param name="userCertificateValidationCallback">A LocalCertificateSelectionCallback delegate responsible for selecting the certificate used for authentication</param>
|
|
|
+ private void Init(string brokerHostName, int brokerPort, bool secure, X509Certificate caCert, MqttSslProtocols sslProtocol,
|
|
|
+ RemoteCertificateValidationCallback userCertificateValidationCallback,
|
|
|
+ LocalCertificateSelectionCallback userCertificateSelectionCallback)
|
|
|
+#elif (WINDOWS_APP || WINDOWS_PHONE_APP)
|
|
|
+ private void Init(string brokerHostName, int brokerPort, bool secure, MqttSslProtocols sslProtocol)
|
|
|
+#else
|
|
|
+ private void Init(string brokerHostName, int brokerPort, bool secure, X509Certificate caCert, MqttSslProtocols sslProtocol)
|
|
|
+#endif
|
|
|
+ {
|
|
|
+ // set default MQTT protocol version (default is 3.1.1)
|
|
|
+ this.ProtocolVersion = MqttProtocolVersion.Version_3_1_1;
|
|
|
+#if !SSL
|
|
|
+ // check security parameters
|
|
|
+ if (secure)
|
|
|
+ throw new ArgumentException("Library compiled without SSL support");
|
|
|
+#endif
|
|
|
+
|
|
|
+ this.brokerHostName = brokerHostName;
|
|
|
+ this.brokerPort = brokerPort;
|
|
|
+
|
|
|
+ // reference to MQTT settings
|
|
|
+ this.settings = MqttSettings.Instance;
|
|
|
+ // set settings port based on secure connection or not
|
|
|
+ if (!secure)
|
|
|
+ this.settings.Port = this.brokerPort;
|
|
|
+ else
|
|
|
+ this.settings.SslPort = this.brokerPort;
|
|
|
+
|
|
|
+ this.syncEndReceiving = new AutoResetEvent(false);
|
|
|
+ this.keepAliveEvent = new AutoResetEvent(false);
|
|
|
+
|
|
|
+ // queue for handling inflight messages (publishing and acknowledge)
|
|
|
+ this.inflightWaitHandle = new AutoResetEvent(false);
|
|
|
+ this.inflightQueue = new Queue();
|
|
|
+
|
|
|
+ // queue for received message
|
|
|
+ this.receiveEventWaitHandle = new AutoResetEvent(false);
|
|
|
+ this.eventQueue = new Queue();
|
|
|
+ this.internalQueue = new Queue();
|
|
|
+
|
|
|
+ // session
|
|
|
+ this.session = null;
|
|
|
+
|
|
|
+ // create network channel
|
|
|
+#if !(MF_FRAMEWORK_VERSION_V4_2 || MF_FRAMEWORK_VERSION_V4_3 || COMPACT_FRAMEWORK || WINDOWS_APP || WINDOWS_PHONE_APP)
|
|
|
+ this.channel = new MqttNetworkChannel(this.brokerHostName, this.brokerPort, secure, caCert, sslProtocol, userCertificateValidationCallback, userCertificateSelectionCallback);
|
|
|
+#elif (WINDOWS_APP || WINDOWS_PHONE_APP)
|
|
|
+ this.channel = new MqttNetworkChannel(this.brokerHostName, this.brokerPort, secure, sslProtocol);
|
|
|
+#else
|
|
|
+ this.channel = new MqttNetworkChannel(this.brokerHostName, this.brokerPort, secure, caCert, sslProtocol);
|
|
|
+#endif
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Connect to broker
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="clientId">Client identifier</param>
|
|
|
+ /// <returns>Return code of CONNACK message from broker</returns>
|
|
|
+ public byte Connect(string clientId)
|
|
|
+ {
|
|
|
+ return this.Connect(clientId, null, null, false, MqttMsgConnect.QOS_LEVEL_AT_MOST_ONCE, false, null, null, true, MqttMsgConnect.KEEP_ALIVE_PERIOD_DEFAULT);
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Connect to broker
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="clientId">Client identifier</param>
|
|
|
+ /// <param name="username">Username</param>
|
|
|
+ /// <param name="password">Password</param>
|
|
|
+ /// <returns>Return code of CONNACK message from broker</returns>
|
|
|
+ public byte Connect(string clientId,
|
|
|
+ string username,
|
|
|
+ string password)
|
|
|
+ {
|
|
|
+ return this.Connect(clientId, username, password, false, MqttMsgConnect.QOS_LEVEL_AT_MOST_ONCE, false, null, null, true, MqttMsgConnect.KEEP_ALIVE_PERIOD_DEFAULT);
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Connect to broker
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="clientId">Client identifier</param>
|
|
|
+ /// <param name="username">Username</param>
|
|
|
+ /// <param name="password">Password</param>
|
|
|
+ /// <param name="cleanSession">Clean sessione flag</param>
|
|
|
+ /// <param name="keepAlivePeriod">Keep alive period</param>
|
|
|
+ /// <returns>Return code of CONNACK message from broker</returns>
|
|
|
+ public byte Connect(string clientId,
|
|
|
+ string username,
|
|
|
+ string password,
|
|
|
+ bool cleanSession,
|
|
|
+ ushort keepAlivePeriod)
|
|
|
+ {
|
|
|
+ return this.Connect(clientId, username, password, false, MqttMsgConnect.QOS_LEVEL_AT_MOST_ONCE, false, null, null, cleanSession, keepAlivePeriod);
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Connect to broker
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="clientId">Client identifier</param>
|
|
|
+ /// <param name="username">Username</param>
|
|
|
+ /// <param name="password">Password</param>
|
|
|
+ /// <param name="willRetain">Will retain flag</param>
|
|
|
+ /// <param name="willQosLevel">Will QOS level</param>
|
|
|
+ /// <param name="willFlag">Will flag</param>
|
|
|
+ /// <param name="willTopic">Will topic</param>
|
|
|
+ /// <param name="willMessage">Will message</param>
|
|
|
+ /// <param name="cleanSession">Clean sessione flag</param>
|
|
|
+ /// <param name="keepAlivePeriod">Keep alive period</param>
|
|
|
+ /// <returns>Return code of CONNACK message from broker</returns>
|
|
|
+ public byte Connect(string clientId,
|
|
|
+ string username,
|
|
|
+ string password,
|
|
|
+ bool willRetain,
|
|
|
+ byte willQosLevel,
|
|
|
+ bool willFlag,
|
|
|
+ string willTopic,
|
|
|
+ string willMessage,
|
|
|
+ bool cleanSession,
|
|
|
+ ushort keepAlivePeriod)
|
|
|
+ {
|
|
|
+ // create CONNECT message
|
|
|
+ MqttMsgConnect connect = new MqttMsgConnect(clientId,
|
|
|
+ username,
|
|
|
+ password,
|
|
|
+ willRetain,
|
|
|
+ willQosLevel,
|
|
|
+ willFlag,
|
|
|
+ willTopic,
|
|
|
+ willMessage,
|
|
|
+ cleanSession,
|
|
|
+ keepAlivePeriod,
|
|
|
+ (byte)this.ProtocolVersion);
|
|
|
+
|
|
|
+ try
|
|
|
+ {
|
|
|
+ // connect to the broker
|
|
|
+ this.channel.Connect();
|
|
|
+ }
|
|
|
+ catch (Exception ex)
|
|
|
+ {
|
|
|
+ throw new MqttConnectionException("Exception connecting to the broker", ex);
|
|
|
+ }
|
|
|
+
|
|
|
+ this.lastCommTime = 0;
|
|
|
+ this.isRunning = true;
|
|
|
+ this.isConnectionClosing = false;
|
|
|
+ // start thread for receiving messages from broker
|
|
|
+ Fx.StartThread(this.ReceiveThread);
|
|
|
+
|
|
|
+ MqttMsgConnack connack = (MqttMsgConnack)this.SendReceive(connect);
|
|
|
+ // if connection accepted, start keep alive timer and
|
|
|
+ if (connack.ReturnCode == MqttMsgConnack.CONN_ACCEPTED)
|
|
|
+ {
|
|
|
+ // set all client properties
|
|
|
+ this.ClientId = clientId;
|
|
|
+ this.CleanSession = cleanSession;
|
|
|
+ this.WillFlag = willFlag;
|
|
|
+ this.WillTopic = willTopic;
|
|
|
+ this.WillMessage = willMessage;
|
|
|
+ this.WillQosLevel = willQosLevel;
|
|
|
+
|
|
|
+ this.keepAlivePeriod = keepAlivePeriod * 1000; // convert in ms
|
|
|
+
|
|
|
+ // restore previous session
|
|
|
+ this.RestoreSession();
|
|
|
+
|
|
|
+ // keep alive period equals zero means turning off keep alive mechanism
|
|
|
+ if (this.keepAlivePeriod != 0)
|
|
|
+ {
|
|
|
+ // start thread for sending keep alive message to the broker
|
|
|
+ Fx.StartThread(this.KeepAliveThread);
|
|
|
+ }
|
|
|
+
|
|
|
+ // start thread for raising received message event from broker
|
|
|
+ Fx.StartThread(this.DispatchEventThread);
|
|
|
+
|
|
|
+ // start thread for handling inflight messages queue to broker asynchronously (publish and acknowledge)
|
|
|
+ Fx.StartThread(this.ProcessInflightThread);
|
|
|
+
|
|
|
+ this.IsConnected = true;
|
|
|
+ }
|
|
|
+ return connack.ReturnCode;
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Disconnect from broker
|
|
|
+ /// </summary>
|
|
|
+ public void Disconnect()
|
|
|
+ {
|
|
|
+ MqttMsgDisconnect disconnect = new MqttMsgDisconnect();
|
|
|
+ this.Send(disconnect);
|
|
|
+
|
|
|
+ // close client
|
|
|
+ this.OnConnectionClosing();
|
|
|
+ }
|
|
|
+
|
|
|
+#if BROKER
|
|
|
+ /// <summary>
|
|
|
+ /// Open client communication
|
|
|
+ /// </summary>
|
|
|
+ public void Open()
|
|
|
+ {
|
|
|
+ this.isRunning = true;
|
|
|
+
|
|
|
+ // start thread for receiving messages from client
|
|
|
+ Fx.StartThread(this.ReceiveThread);
|
|
|
+
|
|
|
+ // start thread for raising received message event from client
|
|
|
+ Fx.StartThread(this.DispatchEventThread);
|
|
|
+
|
|
|
+ // start thread for handling inflight messages queue to client asynchronously (publish and acknowledge)
|
|
|
+ Fx.StartThread(this.ProcessInflightThread);
|
|
|
+ }
|
|
|
+#endif
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Close client
|
|
|
+ /// </summary>
|
|
|
+#if BROKER
|
|
|
+ public void Close()
|
|
|
+#else
|
|
|
+ private void Close()
|
|
|
+#endif
|
|
|
+ {
|
|
|
+ // stop receiving thread
|
|
|
+ this.isRunning = false;
|
|
|
+
|
|
|
+ // wait end receive event thread
|
|
|
+ if (this.receiveEventWaitHandle != null)
|
|
|
+ this.receiveEventWaitHandle.Set();
|
|
|
+
|
|
|
+ // wait end process inflight thread
|
|
|
+ if (this.inflightWaitHandle != null)
|
|
|
+ this.inflightWaitHandle.Set();
|
|
|
+
|
|
|
+#if BROKER
|
|
|
+ // unlock keep alive thread
|
|
|
+ this.keepAliveEvent.Set();
|
|
|
+#else
|
|
|
+ // unlock keep alive thread and wait
|
|
|
+ this.keepAliveEvent.Set();
|
|
|
+
|
|
|
+ if (this.keepAliveEventEnd != null)
|
|
|
+ this.keepAliveEventEnd.WaitOne();
|
|
|
+#endif
|
|
|
+
|
|
|
+ // clear all queues
|
|
|
+ this.inflightQueue.Clear();
|
|
|
+ this.internalQueue.Clear();
|
|
|
+ this.eventQueue.Clear();
|
|
|
+
|
|
|
+ // close network channel
|
|
|
+ this.channel.Close();
|
|
|
+
|
|
|
+ this.IsConnected = false;
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Execute ping to broker for keep alive
|
|
|
+ /// </summary>
|
|
|
+ /// <returns>PINGRESP message from broker</returns>
|
|
|
+ private MqttMsgPingResp Ping()
|
|
|
+ {
|
|
|
+ MqttMsgPingReq pingreq = new MqttMsgPingReq();
|
|
|
+ try
|
|
|
+ {
|
|
|
+ // broker must send PINGRESP within timeout equal to keep alive period
|
|
|
+ return (MqttMsgPingResp)this.SendReceive(pingreq, this.keepAlivePeriod);
|
|
|
+ }
|
|
|
+ catch (Exception e)
|
|
|
+ {
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Error, "Exception occurred: {0}", e.ToString());
|
|
|
+#endif
|
|
|
+
|
|
|
+ // client must close connection
|
|
|
+ this.OnConnectionClosing();
|
|
|
+ return null;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+#if BROKER
|
|
|
+ /// <summary>
|
|
|
+ /// Send CONNACK message to the client (connection accepted or not)
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="connect">CONNECT message with all client information</param>
|
|
|
+ /// <param name="returnCode">Return code for CONNACK message</param>
|
|
|
+ /// <param name="clientId">If not null, client id assigned by broker</param>
|
|
|
+ /// <param name="sessionPresent">Session present on the broker</param>
|
|
|
+ public void Connack(MqttMsgConnect connect, byte returnCode, string clientId, bool sessionPresent)
|
|
|
+ {
|
|
|
+ this.lastCommTime = 0;
|
|
|
+
|
|
|
+ // create CONNACK message and ...
|
|
|
+ MqttMsgConnack connack = new MqttMsgConnack();
|
|
|
+ connack.ReturnCode = returnCode;
|
|
|
+ // [v3.1.1] session present flag
|
|
|
+ if (this.ProtocolVersion == MqttProtocolVersion.Version_3_1_1)
|
|
|
+ connack.SessionPresent = sessionPresent;
|
|
|
+ // ... send it to the client
|
|
|
+ this.Send(connack);
|
|
|
+
|
|
|
+ // connection accepted, start keep alive thread checking
|
|
|
+ if (connack.ReturnCode == MqttMsgConnack.CONN_ACCEPTED)
|
|
|
+ {
|
|
|
+ // [v3.1.1] if client id isn't null, the CONNECT message has a cliend id with zero bytes length
|
|
|
+ // and broker assigned a unique identifier to the client
|
|
|
+ this.ClientId = (clientId == null) ? connect.ClientId : clientId;
|
|
|
+ this.CleanSession = connect.CleanSession;
|
|
|
+ this.WillFlag = connect.WillFlag;
|
|
|
+ this.WillTopic = connect.WillTopic;
|
|
|
+ this.WillMessage = connect.WillMessage;
|
|
|
+ this.WillQosLevel = connect.WillQosLevel;
|
|
|
+
|
|
|
+ this.keepAlivePeriod = connect.KeepAlivePeriod * 1000; // convert in ms
|
|
|
+ // broker has a tolerance of 1.5 specified keep alive period
|
|
|
+ this.keepAlivePeriod += (this.keepAlivePeriod / 2);
|
|
|
+
|
|
|
+ // start thread for checking keep alive period timeout
|
|
|
+ Fx.StartThread(this.KeepAliveThread);
|
|
|
+
|
|
|
+ this.isConnectionClosing = false;
|
|
|
+ this.IsConnected = true;
|
|
|
+ }
|
|
|
+ // connection refused, close TCP/IP channel
|
|
|
+ else
|
|
|
+ {
|
|
|
+ this.Close();
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Send SUBACK message to the client
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="messageId">Message Id for the SUBSCRIBE message that is being acknowledged</param>
|
|
|
+ /// <param name="grantedQosLevels">Granted QoS Levels</param>
|
|
|
+ public void Suback(ushort messageId, byte[] grantedQosLevels)
|
|
|
+ {
|
|
|
+ MqttMsgSuback suback = new MqttMsgSuback();
|
|
|
+ suback.MessageId = messageId;
|
|
|
+ suback.GrantedQoSLevels = grantedQosLevels;
|
|
|
+
|
|
|
+ this.Send(suback);
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Send UNSUBACK message to the client
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="messageId">Message Id for the UNSUBSCRIBE message that is being acknowledged</param>
|
|
|
+ public void Unsuback(ushort messageId)
|
|
|
+ {
|
|
|
+ MqttMsgUnsuback unsuback = new MqttMsgUnsuback();
|
|
|
+ unsuback.MessageId = messageId;
|
|
|
+
|
|
|
+ this.Send(unsuback);
|
|
|
+ }
|
|
|
+#endif
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Subscribe for message topics
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="topics">List of topics to subscribe</param>
|
|
|
+ /// <param name="qosLevels">QOS levels related to topics</param>
|
|
|
+ /// <returns>Message Id related to SUBSCRIBE message</returns>
|
|
|
+ public ushort Subscribe(string[] topics, byte[] qosLevels)
|
|
|
+ {
|
|
|
+ MqttMsgSubscribe subscribe =
|
|
|
+ new MqttMsgSubscribe(topics, qosLevels);
|
|
|
+ subscribe.MessageId = this.GetMessageId();
|
|
|
+
|
|
|
+ // enqueue subscribe request into the inflight queue
|
|
|
+ this.EnqueueInflight(subscribe, MqttMsgFlow.ToPublish);
|
|
|
+
|
|
|
+ return subscribe.MessageId;
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Unsubscribe for message topics
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="topics">List of topics to unsubscribe</param>
|
|
|
+ /// <returns>Message Id in UNSUBACK message from broker</returns>
|
|
|
+ public ushort Unsubscribe(string[] topics)
|
|
|
+ {
|
|
|
+ MqttMsgUnsubscribe unsubscribe =
|
|
|
+ new MqttMsgUnsubscribe(topics);
|
|
|
+ unsubscribe.MessageId = this.GetMessageId();
|
|
|
+
|
|
|
+ // enqueue unsubscribe request into the inflight queue
|
|
|
+ this.EnqueueInflight(unsubscribe, MqttMsgFlow.ToPublish);
|
|
|
+
|
|
|
+ return unsubscribe.MessageId;
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Publish a message asynchronously (QoS Level 0 and not retained)
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="topic">Message topic</param>
|
|
|
+ /// <param name="message">Message data (payload)</param>
|
|
|
+ /// <returns>Message Id related to PUBLISH message</returns>
|
|
|
+ public ushort Publish(string topic, byte[] message)
|
|
|
+ {
|
|
|
+ return this.Publish(topic, message, MqttMsgBase.QOS_LEVEL_AT_MOST_ONCE, false);
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Publish a message asynchronously
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="topic">Message topic</param>
|
|
|
+ /// <param name="message">Message data (payload)</param>
|
|
|
+ /// <param name="qosLevel">QoS Level</param>
|
|
|
+ /// <param name="retain">Retain flag</param>
|
|
|
+ /// <returns>Message Id related to PUBLISH message</returns>
|
|
|
+ public ushort Publish(string topic, byte[] message, byte qosLevel, bool retain)
|
|
|
+ {
|
|
|
+ MqttMsgPublish publish =
|
|
|
+ new MqttMsgPublish(topic, message, false, qosLevel, retain);
|
|
|
+ publish.MessageId = this.GetMessageId();
|
|
|
+
|
|
|
+ // enqueue message to publish into the inflight queue
|
|
|
+ bool enqueue = this.EnqueueInflight(publish, MqttMsgFlow.ToPublish);
|
|
|
+
|
|
|
+ // message enqueued
|
|
|
+ if (enqueue)
|
|
|
+ return publish.MessageId;
|
|
|
+ // infligh queue full, message not enqueued
|
|
|
+ else
|
|
|
+ throw new MqttClientException(MqttClientErrorCode.InflightQueueFull);
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Wrapper method for raising events
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="internalEvent">Internal event</param>
|
|
|
+ private void OnInternalEvent(InternalEvent internalEvent)
|
|
|
+ {
|
|
|
+ lock (this.eventQueue)
|
|
|
+ {
|
|
|
+ this.eventQueue.Enqueue(internalEvent);
|
|
|
+ }
|
|
|
+
|
|
|
+ this.receiveEventWaitHandle.Set();
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Wrapper method for raising closing connection event
|
|
|
+ /// </summary>
|
|
|
+ private void OnConnectionClosing()
|
|
|
+ {
|
|
|
+ if (!this.isConnectionClosing)
|
|
|
+ {
|
|
|
+ this.isConnectionClosing = true;
|
|
|
+ this.receiveEventWaitHandle.Set();
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Wrapper method for raising PUBLISH message received event
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="publish">PUBLISH message received</param>
|
|
|
+ private void OnMqttMsgPublishReceived(MqttMsgPublish publish)
|
|
|
+ {
|
|
|
+ if (this.MqttMsgPublishReceived != null)
|
|
|
+ {
|
|
|
+ this.MqttMsgPublishReceived(this,
|
|
|
+ new MqttMsgPublishEventArgs(publish.Topic, publish.Message, publish.DupFlag, publish.QosLevel, publish.Retain));
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Wrapper method for raising published message event
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="messageId">Message identifier for published message</param>
|
|
|
+ /// <param name="isPublished">Publish flag</param>
|
|
|
+ private void OnMqttMsgPublished(ushort messageId, bool isPublished)
|
|
|
+ {
|
|
|
+ if (this.MqttMsgPublished != null)
|
|
|
+ {
|
|
|
+ this.MqttMsgPublished(this,
|
|
|
+ new MqttMsgPublishedEventArgs(messageId, isPublished));
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Wrapper method for raising subscribed topic event
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="suback">SUBACK message received</param>
|
|
|
+ private void OnMqttMsgSubscribed(MqttMsgSuback suback)
|
|
|
+ {
|
|
|
+ if (this.MqttMsgSubscribed != null)
|
|
|
+ {
|
|
|
+ this.MqttMsgSubscribed(this,
|
|
|
+ new MqttMsgSubscribedEventArgs(suback.MessageId, suback.GrantedQoSLevels));
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Wrapper method for raising unsubscribed topic event
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="messageId">Message identifier for unsubscribed topic</param>
|
|
|
+ private void OnMqttMsgUnsubscribed(ushort messageId)
|
|
|
+ {
|
|
|
+ if (this.MqttMsgUnsubscribed != null)
|
|
|
+ {
|
|
|
+ this.MqttMsgUnsubscribed(this,
|
|
|
+ new MqttMsgUnsubscribedEventArgs(messageId));
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+#if BROKER
|
|
|
+ /// <summary>
|
|
|
+ /// Wrapper method for raising SUBSCRIBE message event
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="messageId">Message identifier for subscribe topics request</param>
|
|
|
+ /// <param name="topics">Topics requested to subscribe</param>
|
|
|
+ /// <param name="qosLevels">List of QOS Levels requested</param>
|
|
|
+ private void OnMqttMsgSubscribeReceived(ushort messageId, string[] topics, byte[] qosLevels)
|
|
|
+ {
|
|
|
+ if (this.MqttMsgSubscribeReceived != null)
|
|
|
+ {
|
|
|
+ this.MqttMsgSubscribeReceived(this,
|
|
|
+ new MqttMsgSubscribeEventArgs(messageId, topics, qosLevels));
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Wrapper method for raising UNSUBSCRIBE message event
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="messageId">Message identifier for unsubscribe topics request</param>
|
|
|
+ /// <param name="topics">Topics requested to unsubscribe</param>
|
|
|
+ private void OnMqttMsgUnsubscribeReceived(ushort messageId, string[] topics)
|
|
|
+ {
|
|
|
+ if (this.MqttMsgUnsubscribeReceived != null)
|
|
|
+ {
|
|
|
+ this.MqttMsgUnsubscribeReceived(this,
|
|
|
+ new MqttMsgUnsubscribeEventArgs(messageId, topics));
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Wrapper method for raising CONNECT message event
|
|
|
+ /// </summary>
|
|
|
+ private void OnMqttMsgConnected(MqttMsgConnect connect)
|
|
|
+ {
|
|
|
+ if (this.MqttMsgConnected != null)
|
|
|
+ {
|
|
|
+ this.ProtocolVersion = (MqttProtocolVersion)connect.ProtocolVersion;
|
|
|
+ this.MqttMsgConnected(this, new MqttMsgConnectEventArgs(connect));
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Wrapper method for raising DISCONNECT message event
|
|
|
+ /// </summary>
|
|
|
+ private void OnMqttMsgDisconnected()
|
|
|
+ {
|
|
|
+ if (this.MqttMsgDisconnected != null)
|
|
|
+ {
|
|
|
+ this.MqttMsgDisconnected(this, EventArgs.Empty);
|
|
|
+ }
|
|
|
+ }
|
|
|
+#endif
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Wrapper method for peer/client disconnection
|
|
|
+ /// </summary>
|
|
|
+ private void OnConnectionClosed()
|
|
|
+ {
|
|
|
+ if (this.ConnectionClosed != null)
|
|
|
+ {
|
|
|
+ this.ConnectionClosed(this, EventArgs.Empty);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Send a message
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="msgBytes">Message bytes</param>
|
|
|
+ private void Send(byte[] msgBytes)
|
|
|
+ {
|
|
|
+ try
|
|
|
+ {
|
|
|
+ // send message
|
|
|
+ this.channel.Send(msgBytes);
|
|
|
+
|
|
|
+#if !BROKER
|
|
|
+ // update last message sent ticks
|
|
|
+ this.lastCommTime = Environment.TickCount;
|
|
|
+#endif
|
|
|
+ }
|
|
|
+ catch (Exception e)
|
|
|
+ {
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Error, "Exception occurred: {0}", e.ToString());
|
|
|
+#endif
|
|
|
+
|
|
|
+ throw new MqttCommunicationException(e);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Send a message
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="msg">Message</param>
|
|
|
+ private void Send(MqttMsgBase msg)
|
|
|
+ {
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Frame, "SEND {0}", msg);
|
|
|
+#endif
|
|
|
+ this.Send(msg.GetBytes((byte)this.ProtocolVersion));
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Send a message to the broker and wait answer
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="msgBytes">Message bytes</param>
|
|
|
+ /// <returns>MQTT message response</returns>
|
|
|
+ private MqttMsgBase SendReceive(byte[] msgBytes)
|
|
|
+ {
|
|
|
+ return this.SendReceive(msgBytes, MqttSettings.MQTT_DEFAULT_TIMEOUT);
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Send a message to the broker and wait answer
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="msgBytes">Message bytes</param>
|
|
|
+ /// <param name="timeout">Timeout for receiving answer</param>
|
|
|
+ /// <returns>MQTT message response</returns>
|
|
|
+ private MqttMsgBase SendReceive(byte[] msgBytes, int timeout)
|
|
|
+ {
|
|
|
+ // reset handle before sending
|
|
|
+ this.syncEndReceiving.Reset();
|
|
|
+ try
|
|
|
+ {
|
|
|
+ // send message
|
|
|
+ this.channel.Send(msgBytes);
|
|
|
+
|
|
|
+ // update last message sent ticks
|
|
|
+ this.lastCommTime = Environment.TickCount;
|
|
|
+ }
|
|
|
+ catch (Exception e)
|
|
|
+ {
|
|
|
+#if !(MF_FRAMEWORK_VERSION_V4_2 || MF_FRAMEWORK_VERSION_V4_3 || COMPACT_FRAMEWORK || WINDOWS_APP || WINDOWS_PHONE_APP)
|
|
|
+ if (typeof(SocketException) == e.GetType())
|
|
|
+ {
|
|
|
+ // connection reset by broker
|
|
|
+ if (((SocketException)e).SocketErrorCode == SocketError.ConnectionReset)
|
|
|
+ this.IsConnected = false;
|
|
|
+ }
|
|
|
+#endif
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Error, "Exception occurred: {0}", e.ToString());
|
|
|
+#endif
|
|
|
+
|
|
|
+ throw new MqttCommunicationException(e);
|
|
|
+ }
|
|
|
+
|
|
|
+#if (MF_FRAMEWORK_VERSION_V4_2 || MF_FRAMEWORK_VERSION_V4_3 || COMPACT_FRAMEWORK)
|
|
|
+ // wait for answer from broker
|
|
|
+ if (this.syncEndReceiving.WaitOne(timeout, false))
|
|
|
+#else
|
|
|
+ // wait for answer from broker
|
|
|
+ if (this.syncEndReceiving.WaitOne(timeout))
|
|
|
+#endif
|
|
|
+ {
|
|
|
+ // message received without exception
|
|
|
+ if (this.exReceiving == null)
|
|
|
+ return this.msgReceived;
|
|
|
+ // receiving thread catched exception
|
|
|
+ else
|
|
|
+ throw this.exReceiving;
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ // throw timeout exception
|
|
|
+ throw new MqttCommunicationException();
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Send a message to the broker and wait answer
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="msg">Message</param>
|
|
|
+ /// <returns>MQTT message response</returns>
|
|
|
+ private MqttMsgBase SendReceive(MqttMsgBase msg)
|
|
|
+ {
|
|
|
+ return this.SendReceive(msg, MqttSettings.MQTT_DEFAULT_TIMEOUT);
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Send a message to the broker and wait answer
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="msg">Message</param>
|
|
|
+ /// <param name="timeout">Timeout for receiving answer</param>
|
|
|
+ /// <returns>MQTT message response</returns>
|
|
|
+ private MqttMsgBase SendReceive(MqttMsgBase msg, int timeout)
|
|
|
+ {
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Frame, "SEND {0}", msg);
|
|
|
+#endif
|
|
|
+ return this.SendReceive(msg.GetBytes((byte)this.ProtocolVersion), timeout);
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Enqueue a message into the inflight queue
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="msg">Message to enqueue</param>
|
|
|
+ /// <param name="flow">Message flow (publish, acknowledge)</param>
|
|
|
+ /// <returns>Message enqueued or not</returns>
|
|
|
+ private bool EnqueueInflight(MqttMsgBase msg, MqttMsgFlow flow)
|
|
|
+ {
|
|
|
+ // enqueue is needed (or not)
|
|
|
+ bool enqueue = true;
|
|
|
+
|
|
|
+ // if it is a PUBLISH message with QoS Level 2
|
|
|
+ if ((msg.Type == MqttMsgBase.MQTT_MSG_PUBLISH_TYPE) &&
|
|
|
+ (msg.QosLevel == MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE))
|
|
|
+ {
|
|
|
+ lock (this.inflightQueue)
|
|
|
+ {
|
|
|
+ // if it is a PUBLISH message already received (it is in the inflight queue), the publisher
|
|
|
+ // re-sent it because it didn't received the PUBREC. In this case, we have to re-send PUBREC
|
|
|
+
|
|
|
+ // NOTE : I need to find on message id and flow because the broker could be publish/received
|
|
|
+ // to/from client and message id could be the same (one tracked by broker and the other by client)
|
|
|
+ MqttMsgContextFinder msgCtxFinder = new MqttMsgContextFinder(msg.MessageId, MqttMsgFlow.ToAcknowledge);
|
|
|
+ MqttMsgContext msgCtx = (MqttMsgContext)this.inflightQueue.Get(msgCtxFinder.Find);
|
|
|
+
|
|
|
+ // the PUBLISH message is alredy in the inflight queue, we don't need to re-enqueue but we need
|
|
|
+ // to change state to re-send PUBREC
|
|
|
+ if (msgCtx != null)
|
|
|
+ {
|
|
|
+ msgCtx.State = MqttMsgState.QueuedQos2;
|
|
|
+ msgCtx.Flow = MqttMsgFlow.ToAcknowledge;
|
|
|
+ enqueue = false;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (enqueue)
|
|
|
+ {
|
|
|
+ // set a default state
|
|
|
+ MqttMsgState state = MqttMsgState.QueuedQos0;
|
|
|
+
|
|
|
+ // based on QoS level, the messages flow between broker and client changes
|
|
|
+ switch (msg.QosLevel)
|
|
|
+ {
|
|
|
+ // QoS Level 0
|
|
|
+ case MqttMsgBase.QOS_LEVEL_AT_MOST_ONCE:
|
|
|
+
|
|
|
+ state = MqttMsgState.QueuedQos0;
|
|
|
+ break;
|
|
|
+
|
|
|
+ // QoS Level 1
|
|
|
+ case MqttMsgBase.QOS_LEVEL_AT_LEAST_ONCE:
|
|
|
+
|
|
|
+ state = MqttMsgState.QueuedQos1;
|
|
|
+ break;
|
|
|
+
|
|
|
+ // QoS Level 2
|
|
|
+ case MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE:
|
|
|
+
|
|
|
+ state = MqttMsgState.QueuedQos2;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ // [v3.1.1] SUBSCRIBE and UNSUBSCRIBE aren't "officially" QOS = 1
|
|
|
+ // so QueuedQos1 state isn't valid for them
|
|
|
+ if (msg.Type == MqttMsgBase.MQTT_MSG_SUBSCRIBE_TYPE)
|
|
|
+ state = MqttMsgState.SendSubscribe;
|
|
|
+ else if (msg.Type == MqttMsgBase.MQTT_MSG_UNSUBSCRIBE_TYPE)
|
|
|
+ state = MqttMsgState.SendUnsubscribe;
|
|
|
+
|
|
|
+ // queue message context
|
|
|
+ MqttMsgContext msgContext = new MqttMsgContext()
|
|
|
+ {
|
|
|
+ Message = msg,
|
|
|
+ State = state,
|
|
|
+ Flow = flow,
|
|
|
+ Attempt = 0
|
|
|
+ };
|
|
|
+
|
|
|
+ lock (this.inflightQueue)
|
|
|
+ {
|
|
|
+ // check number of messages inside inflight queue
|
|
|
+ enqueue = (this.inflightQueue.Count < this.settings.InflightQueueSize);
|
|
|
+
|
|
|
+ if (enqueue)
|
|
|
+ {
|
|
|
+ // enqueue message and unlock send thread
|
|
|
+ this.inflightQueue.Enqueue(msgContext);
|
|
|
+
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Queuing, "enqueued {0}", msg);
|
|
|
+#endif
|
|
|
+
|
|
|
+ // PUBLISH message
|
|
|
+ if (msg.Type == MqttMsgBase.MQTT_MSG_PUBLISH_TYPE)
|
|
|
+ {
|
|
|
+ // to publish and QoS level 1 or 2
|
|
|
+ if ((msgContext.Flow == MqttMsgFlow.ToPublish) &&
|
|
|
+ ((msg.QosLevel == MqttMsgBase.QOS_LEVEL_AT_LEAST_ONCE) ||
|
|
|
+ (msg.QosLevel == MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE)))
|
|
|
+ {
|
|
|
+ if (this.session != null)
|
|
|
+ this.session.InflightMessages.Add(msgContext.Key, msgContext);
|
|
|
+ }
|
|
|
+ // to acknowledge and QoS level 2
|
|
|
+ else if ((msgContext.Flow == MqttMsgFlow.ToAcknowledge) &&
|
|
|
+ (msg.QosLevel == MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE))
|
|
|
+ {
|
|
|
+ if (this.session != null)
|
|
|
+ this.session.InflightMessages.Add(msgContext.Key, msgContext);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ this.inflightWaitHandle.Set();
|
|
|
+
|
|
|
+ return enqueue;
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Enqueue a message into the internal queue
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="msg">Message to enqueue</param>
|
|
|
+ private void EnqueueInternal(MqttMsgBase msg)
|
|
|
+ {
|
|
|
+ // enqueue is needed (or not)
|
|
|
+ bool enqueue = true;
|
|
|
+
|
|
|
+ // if it is a PUBREL message (for QoS Level 2)
|
|
|
+ if (msg.Type == MqttMsgBase.MQTT_MSG_PUBREL_TYPE)
|
|
|
+ {
|
|
|
+ lock (this.inflightQueue)
|
|
|
+ {
|
|
|
+ // if it is a PUBREL but the corresponding PUBLISH isn't in the inflight queue,
|
|
|
+ // it means that we processed PUBLISH message and received PUBREL and we sent PUBCOMP
|
|
|
+ // but publisher didn't receive PUBCOMP so it re-sent PUBREL. We need only to re-send PUBCOMP.
|
|
|
+
|
|
|
+ // NOTE : I need to find on message id and flow because the broker could be publish/received
|
|
|
+ // to/from client and message id could be the same (one tracked by broker and the other by client)
|
|
|
+ MqttMsgContextFinder msgCtxFinder = new MqttMsgContextFinder(msg.MessageId, MqttMsgFlow.ToAcknowledge);
|
|
|
+ MqttMsgContext msgCtx = (MqttMsgContext)this.inflightQueue.Get(msgCtxFinder.Find);
|
|
|
+
|
|
|
+ // the PUBLISH message isn't in the inflight queue, it was already processed so
|
|
|
+ // we need to re-send PUBCOMP only
|
|
|
+ if (msgCtx == null)
|
|
|
+ {
|
|
|
+ MqttMsgPubcomp pubcomp = new MqttMsgPubcomp();
|
|
|
+ pubcomp.MessageId = msg.MessageId;
|
|
|
+
|
|
|
+ this.Send(pubcomp);
|
|
|
+
|
|
|
+ enqueue = false;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ // if it is a PUBCOMP message (for QoS Level 2)
|
|
|
+ else if (msg.Type == MqttMsgBase.MQTT_MSG_PUBCOMP_TYPE)
|
|
|
+ {
|
|
|
+ lock (this.inflightQueue)
|
|
|
+ {
|
|
|
+ // if it is a PUBCOMP but the corresponding PUBLISH isn't in the inflight queue,
|
|
|
+ // it means that we sent PUBLISH message, sent PUBREL (after receiving PUBREC) and already received PUBCOMP
|
|
|
+ // but publisher didn't receive PUBREL so it re-sent PUBCOMP. We need only to ignore this PUBCOMP.
|
|
|
+
|
|
|
+ // NOTE : I need to find on message id and flow because the broker could be publish/received
|
|
|
+ // to/from client and message id could be the same (one tracked by broker and the other by client)
|
|
|
+ MqttMsgContextFinder msgCtxFinder = new MqttMsgContextFinder(msg.MessageId, MqttMsgFlow.ToPublish);
|
|
|
+ MqttMsgContext msgCtx = (MqttMsgContext)this.inflightQueue.Get(msgCtxFinder.Find);
|
|
|
+
|
|
|
+ // the PUBLISH message isn't in the inflight queue, it was already sent so we need to ignore this PUBCOMP
|
|
|
+ if (msgCtx == null)
|
|
|
+ {
|
|
|
+ enqueue = false;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ // if it is a PUBREC message (for QoS Level 2)
|
|
|
+ else if (msg.Type == MqttMsgBase.MQTT_MSG_PUBREC_TYPE)
|
|
|
+ {
|
|
|
+ lock (this.inflightQueue)
|
|
|
+ {
|
|
|
+ // if it is a PUBREC but the corresponding PUBLISH isn't in the inflight queue,
|
|
|
+ // it means that we sent PUBLISH message more times (retries) but broker didn't send PUBREC in time
|
|
|
+ // the publish is failed and we need only to ignore this PUBREC.
|
|
|
+
|
|
|
+ // NOTE : I need to find on message id and flow because the broker could be publish/received
|
|
|
+ // to/from client and message id could be the same (one tracked by broker and the other by client)
|
|
|
+ MqttMsgContextFinder msgCtxFinder = new MqttMsgContextFinder(msg.MessageId, MqttMsgFlow.ToPublish);
|
|
|
+ MqttMsgContext msgCtx = (MqttMsgContext)this.inflightQueue.Get(msgCtxFinder.Find);
|
|
|
+
|
|
|
+ // the PUBLISH message isn't in the inflight queue, it was already sent so we need to ignore this PUBREC
|
|
|
+ if (msgCtx == null)
|
|
|
+ {
|
|
|
+ enqueue = false;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (enqueue)
|
|
|
+ {
|
|
|
+ lock (this.internalQueue)
|
|
|
+ {
|
|
|
+ this.internalQueue.Enqueue(msg);
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Queuing, "enqueued {0}", msg);
|
|
|
+#endif
|
|
|
+ this.inflightWaitHandle.Set();
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Thread for receiving messages
|
|
|
+ /// </summary>
|
|
|
+ private void ReceiveThread()
|
|
|
+ {
|
|
|
+ int readBytes = 0;
|
|
|
+ byte[] fixedHeaderFirstByte = new byte[1];
|
|
|
+ byte msgType;
|
|
|
+
|
|
|
+ while (this.isRunning)
|
|
|
+ {
|
|
|
+ try
|
|
|
+ {
|
|
|
+ // read first byte (fixed header)
|
|
|
+ readBytes = this.channel.Receive(fixedHeaderFirstByte);
|
|
|
+
|
|
|
+ if (readBytes > 0)
|
|
|
+ {
|
|
|
+#if BROKER
|
|
|
+ // update last message received ticks
|
|
|
+ this.lastCommTime = Environment.TickCount;
|
|
|
+#endif
|
|
|
+
|
|
|
+ // extract message type from received byte
|
|
|
+ msgType = (byte)((fixedHeaderFirstByte[0] & MqttMsgBase.MSG_TYPE_MASK) >> MqttMsgBase.MSG_TYPE_OFFSET);
|
|
|
+
|
|
|
+ switch (msgType)
|
|
|
+ {
|
|
|
+ // CONNECT message received
|
|
|
+ case MqttMsgBase.MQTT_MSG_CONNECT_TYPE:
|
|
|
+
|
|
|
+#if BROKER
|
|
|
+ MqttMsgConnect connect = MqttMsgConnect.Parse(fixedHeaderFirstByte[0], (byte)this.ProtocolVersion, this.channel);
|
|
|
+#if TRACE
|
|
|
+ Trace.WriteLine(TraceLevel.Frame, "RECV {0}", connect);
|
|
|
+#endif
|
|
|
+
|
|
|
+ // raise message received event
|
|
|
+ this.OnInternalEvent(new MsgInternalEvent(connect));
|
|
|
+ break;
|
|
|
+#else
|
|
|
+ throw new MqttClientException(MqttClientErrorCode.WrongBrokerMessage);
|
|
|
+#endif
|
|
|
+
|
|
|
+ // CONNACK message received
|
|
|
+ case MqttMsgBase.MQTT_MSG_CONNACK_TYPE:
|
|
|
+
|
|
|
+#if BROKER
|
|
|
+ throw new MqttClientException(MqttClientErrorCode.WrongBrokerMessage);
|
|
|
+#else
|
|
|
+ this.msgReceived = MqttMsgConnack.Parse(fixedHeaderFirstByte[0], (byte)this.ProtocolVersion, this.channel);
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Frame, "RECV {0}", this.msgReceived);
|
|
|
+#endif
|
|
|
+ this.syncEndReceiving.Set();
|
|
|
+ break;
|
|
|
+#endif
|
|
|
+
|
|
|
+ // PINGREQ message received
|
|
|
+ case MqttMsgBase.MQTT_MSG_PINGREQ_TYPE:
|
|
|
+
|
|
|
+#if BROKER
|
|
|
+ this.msgReceived = MqttMsgPingReq.Parse(fixedHeaderFirstByte[0], (byte)this.ProtocolVersion, this.channel);
|
|
|
+#if TRACE
|
|
|
+ Trace.WriteLine(TraceLevel.Frame, "RECV {0}", this.msgReceived);
|
|
|
+#endif
|
|
|
+
|
|
|
+ MqttMsgPingResp pingresp = new MqttMsgPingResp();
|
|
|
+ this.Send(pingresp);
|
|
|
+
|
|
|
+ break;
|
|
|
+#else
|
|
|
+ throw new MqttClientException(MqttClientErrorCode.WrongBrokerMessage);
|
|
|
+#endif
|
|
|
+
|
|
|
+ // PINGRESP message received
|
|
|
+ case MqttMsgBase.MQTT_MSG_PINGRESP_TYPE:
|
|
|
+
|
|
|
+#if BROKER
|
|
|
+ throw new MqttClientException(MqttClientErrorCode.WrongBrokerMessage);
|
|
|
+#else
|
|
|
+ this.msgReceived = MqttMsgPingResp.Parse(fixedHeaderFirstByte[0], (byte)this.ProtocolVersion, this.channel);
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Frame, "RECV {0}", this.msgReceived);
|
|
|
+#endif
|
|
|
+ this.syncEndReceiving.Set();
|
|
|
+ break;
|
|
|
+#endif
|
|
|
+
|
|
|
+ // SUBSCRIBE message received
|
|
|
+ case MqttMsgBase.MQTT_MSG_SUBSCRIBE_TYPE:
|
|
|
+
|
|
|
+#if BROKER
|
|
|
+ MqttMsgSubscribe subscribe = MqttMsgSubscribe.Parse(fixedHeaderFirstByte[0], (byte)this.ProtocolVersion, this.channel);
|
|
|
+#if TRACE
|
|
|
+ Trace.WriteLine(TraceLevel.Frame, "RECV {0}", subscribe);
|
|
|
+#endif
|
|
|
+
|
|
|
+ // raise message received event
|
|
|
+ this.OnInternalEvent(new MsgInternalEvent(subscribe));
|
|
|
+
|
|
|
+ break;
|
|
|
+#else
|
|
|
+ throw new MqttClientException(MqttClientErrorCode.WrongBrokerMessage);
|
|
|
+#endif
|
|
|
+
|
|
|
+ // SUBACK message received
|
|
|
+ case MqttMsgBase.MQTT_MSG_SUBACK_TYPE:
|
|
|
+
|
|
|
+#if BROKER
|
|
|
+ throw new MqttClientException(MqttClientErrorCode.WrongBrokerMessage);
|
|
|
+#else
|
|
|
+ // enqueue SUBACK message received (for QoS Level 1) into the internal queue
|
|
|
+ MqttMsgSuback suback = MqttMsgSuback.Parse(fixedHeaderFirstByte[0], (byte)this.ProtocolVersion, this.channel);
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Frame, "RECV {0}", suback);
|
|
|
+#endif
|
|
|
+
|
|
|
+ // enqueue SUBACK message into the internal queue
|
|
|
+ this.EnqueueInternal(suback);
|
|
|
+
|
|
|
+ break;
|
|
|
+#endif
|
|
|
+
|
|
|
+ // PUBLISH message received
|
|
|
+ case MqttMsgBase.MQTT_MSG_PUBLISH_TYPE:
|
|
|
+
|
|
|
+ MqttMsgPublish publish = MqttMsgPublish.Parse(fixedHeaderFirstByte[0], (byte)this.ProtocolVersion, this.channel);
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Frame, "RECV {0}", publish);
|
|
|
+#endif
|
|
|
+
|
|
|
+ // enqueue PUBLISH message to acknowledge into the inflight queue
|
|
|
+ this.EnqueueInflight(publish, MqttMsgFlow.ToAcknowledge);
|
|
|
+
|
|
|
+ break;
|
|
|
+
|
|
|
+ // PUBACK message received
|
|
|
+ case MqttMsgBase.MQTT_MSG_PUBACK_TYPE:
|
|
|
+
|
|
|
+ // enqueue PUBACK message received (for QoS Level 1) into the internal queue
|
|
|
+ MqttMsgPuback puback = MqttMsgPuback.Parse(fixedHeaderFirstByte[0], (byte)this.ProtocolVersion, this.channel);
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Frame, "RECV {0}", puback);
|
|
|
+#endif
|
|
|
+
|
|
|
+ // enqueue PUBACK message into the internal queue
|
|
|
+ this.EnqueueInternal(puback);
|
|
|
+
|
|
|
+ break;
|
|
|
+
|
|
|
+ // PUBREC message received
|
|
|
+ case MqttMsgBase.MQTT_MSG_PUBREC_TYPE:
|
|
|
+
|
|
|
+ // enqueue PUBREC message received (for QoS Level 2) into the internal queue
|
|
|
+ MqttMsgPubrec pubrec = MqttMsgPubrec.Parse(fixedHeaderFirstByte[0], (byte)this.ProtocolVersion, this.channel);
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Frame, "RECV {0}", pubrec);
|
|
|
+#endif
|
|
|
+
|
|
|
+ // enqueue PUBREC message into the internal queue
|
|
|
+ this.EnqueueInternal(pubrec);
|
|
|
+
|
|
|
+ break;
|
|
|
+
|
|
|
+ // PUBREL message received
|
|
|
+ case MqttMsgBase.MQTT_MSG_PUBREL_TYPE:
|
|
|
+
|
|
|
+ // enqueue PUBREL message received (for QoS Level 2) into the internal queue
|
|
|
+ MqttMsgPubrel pubrel = MqttMsgPubrel.Parse(fixedHeaderFirstByte[0], (byte)this.ProtocolVersion, this.channel);
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Frame, "RECV {0}", pubrel);
|
|
|
+#endif
|
|
|
+
|
|
|
+ // enqueue PUBREL message into the internal queue
|
|
|
+ this.EnqueueInternal(pubrel);
|
|
|
+
|
|
|
+ break;
|
|
|
+
|
|
|
+ // PUBCOMP message received
|
|
|
+ case MqttMsgBase.MQTT_MSG_PUBCOMP_TYPE:
|
|
|
+
|
|
|
+ // enqueue PUBCOMP message received (for QoS Level 2) into the internal queue
|
|
|
+ MqttMsgPubcomp pubcomp = MqttMsgPubcomp.Parse(fixedHeaderFirstByte[0], (byte)this.ProtocolVersion, this.channel);
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Frame, "RECV {0}", pubcomp);
|
|
|
+#endif
|
|
|
+
|
|
|
+ // enqueue PUBCOMP message into the internal queue
|
|
|
+ this.EnqueueInternal(pubcomp);
|
|
|
+
|
|
|
+ break;
|
|
|
+
|
|
|
+ // UNSUBSCRIBE message received
|
|
|
+ case MqttMsgBase.MQTT_MSG_UNSUBSCRIBE_TYPE:
|
|
|
+
|
|
|
+#if BROKER
|
|
|
+ MqttMsgUnsubscribe unsubscribe = MqttMsgUnsubscribe.Parse(fixedHeaderFirstByte[0], (byte)this.ProtocolVersion, this.channel);
|
|
|
+#if TRACE
|
|
|
+ Trace.WriteLine(TraceLevel.Frame, "RECV {0}", unsubscribe);
|
|
|
+#endif
|
|
|
+
|
|
|
+ // raise message received event
|
|
|
+ this.OnInternalEvent(new MsgInternalEvent(unsubscribe));
|
|
|
+
|
|
|
+ break;
|
|
|
+#else
|
|
|
+ throw new MqttClientException(MqttClientErrorCode.WrongBrokerMessage);
|
|
|
+#endif
|
|
|
+
|
|
|
+ // UNSUBACK message received
|
|
|
+ case MqttMsgBase.MQTT_MSG_UNSUBACK_TYPE:
|
|
|
+
|
|
|
+#if BROKER
|
|
|
+ throw new MqttClientException(MqttClientErrorCode.WrongBrokerMessage);
|
|
|
+#else
|
|
|
+ // enqueue UNSUBACK message received (for QoS Level 1) into the internal queue
|
|
|
+ MqttMsgUnsuback unsuback = MqttMsgUnsuback.Parse(fixedHeaderFirstByte[0], (byte)this.ProtocolVersion, this.channel);
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Frame, "RECV {0}", unsuback);
|
|
|
+#endif
|
|
|
+
|
|
|
+ // enqueue UNSUBACK message into the internal queue
|
|
|
+ this.EnqueueInternal(unsuback);
|
|
|
+
|
|
|
+ break;
|
|
|
+#endif
|
|
|
+
|
|
|
+ // DISCONNECT message received
|
|
|
+ case MqttMsgDisconnect.MQTT_MSG_DISCONNECT_TYPE:
|
|
|
+
|
|
|
+#if BROKER
|
|
|
+ MqttMsgDisconnect disconnect = MqttMsgDisconnect.Parse(fixedHeaderFirstByte[0], (byte)this.ProtocolVersion, this.channel);
|
|
|
+#if TRACE
|
|
|
+ Trace.WriteLine(TraceLevel.Frame, "RECV {0}", disconnect);
|
|
|
+#endif
|
|
|
+
|
|
|
+ // raise message received event
|
|
|
+ this.OnInternalEvent(new MsgInternalEvent(disconnect));
|
|
|
+
|
|
|
+ break;
|
|
|
+#else
|
|
|
+ throw new MqttClientException(MqttClientErrorCode.WrongBrokerMessage);
|
|
|
+#endif
|
|
|
+
|
|
|
+ default:
|
|
|
+
|
|
|
+ throw new MqttClientException(MqttClientErrorCode.WrongBrokerMessage);
|
|
|
+ }
|
|
|
+
|
|
|
+ this.exReceiving = null;
|
|
|
+ }
|
|
|
+ // zero bytes read, peer gracefully closed socket
|
|
|
+ else
|
|
|
+ {
|
|
|
+ // wake up thread that will notify connection is closing
|
|
|
+ this.OnConnectionClosing();
|
|
|
+ }
|
|
|
+ }
|
|
|
+ catch (Exception e)
|
|
|
+ {
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Error, "Exception occurred: {0}", e.ToString());
|
|
|
+#endif
|
|
|
+ this.exReceiving = new MqttCommunicationException(e);
|
|
|
+
|
|
|
+ bool close = false;
|
|
|
+ if (e.GetType() == typeof(MqttClientException))
|
|
|
+ {
|
|
|
+ // [v3.1.1] scenarios the receiver MUST close the network connection
|
|
|
+ MqttClientException ex = e as MqttClientException;
|
|
|
+ close = ((ex.ErrorCode == MqttClientErrorCode.InvalidFlagBits) ||
|
|
|
+ (ex.ErrorCode == MqttClientErrorCode.InvalidProtocolName) ||
|
|
|
+ (ex.ErrorCode == MqttClientErrorCode.InvalidConnectFlags));
|
|
|
+ }
|
|
|
+#if !(WINDOWS_APP || WINDOWS_PHONE_APP)
|
|
|
+ else if ((e.GetType() == typeof(SocketException)) ||
|
|
|
+ ((e.InnerException != null) && (e.InnerException.GetType() == typeof(SocketException)))) // added for SSL/TLS incoming connection that use SslStream that wraps SocketException
|
|
|
+ {
|
|
|
+ close = true;
|
|
|
+ }
|
|
|
+#endif
|
|
|
+
|
|
|
+ if (close)
|
|
|
+ {
|
|
|
+ // wake up thread that will notify connection is closing
|
|
|
+ this.OnConnectionClosing();
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Thread for handling keep alive message
|
|
|
+ /// </summary>
|
|
|
+ private void KeepAliveThread()
|
|
|
+ {
|
|
|
+ int delta = 0;
|
|
|
+ int wait = this.keepAlivePeriod;
|
|
|
+
|
|
|
+ // create event to signal that current thread is end
|
|
|
+ this.keepAliveEventEnd = new AutoResetEvent(false);
|
|
|
+
|
|
|
+ while (this.isRunning)
|
|
|
+ {
|
|
|
+#if (MF_FRAMEWORK_VERSION_V4_2 || MF_FRAMEWORK_VERSION_V4_3 || COMPACT_FRAMEWORK)
|
|
|
+ // waiting...
|
|
|
+ this.keepAliveEvent.WaitOne(wait, false);
|
|
|
+#else
|
|
|
+ // waiting...
|
|
|
+ this.keepAliveEvent.WaitOne(wait);
|
|
|
+#endif
|
|
|
+
|
|
|
+ if (this.isRunning)
|
|
|
+ {
|
|
|
+ delta = Environment.TickCount - this.lastCommTime;
|
|
|
+
|
|
|
+ // if timeout exceeded ...
|
|
|
+ if (delta >= this.keepAlivePeriod)
|
|
|
+ {
|
|
|
+#if BROKER
|
|
|
+ // client must close connection
|
|
|
+ this.OnConnectionClosing();
|
|
|
+#else
|
|
|
+ // ... send keep alive
|
|
|
+ this.Ping();
|
|
|
+ wait = this.keepAlivePeriod;
|
|
|
+#endif
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ // update waiting time
|
|
|
+ wait = this.keepAlivePeriod - delta;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // signal thread end
|
|
|
+ this.keepAliveEventEnd.Set();
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Thread for raising event
|
|
|
+ /// </summary>
|
|
|
+ private void DispatchEventThread()
|
|
|
+ {
|
|
|
+ while (this.isRunning)
|
|
|
+ {
|
|
|
+#if BROKER
|
|
|
+ if ((this.eventQueue.Count == 0) && !this.isConnectionClosing)
|
|
|
+ {
|
|
|
+ // broker need to receive the first message (CONNECT)
|
|
|
+ // within a reasonable amount of time after TCP/IP connection
|
|
|
+ if (!this.IsConnected)
|
|
|
+ {
|
|
|
+ // wait on receiving message from client with a connection timeout
|
|
|
+ if (!this.receiveEventWaitHandle.WaitOne(this.settings.TimeoutOnConnection))
|
|
|
+ {
|
|
|
+ // client must close connection
|
|
|
+ this.Close();
|
|
|
+
|
|
|
+ // client raw disconnection
|
|
|
+ this.OnConnectionClosed();
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ // wait on receiving message from client
|
|
|
+ this.receiveEventWaitHandle.WaitOne();
|
|
|
+ }
|
|
|
+ }
|
|
|
+#else
|
|
|
+ if ((this.eventQueue.Count == 0) && !this.isConnectionClosing)
|
|
|
+ // wait on receiving message from client
|
|
|
+ this.receiveEventWaitHandle.WaitOne();
|
|
|
+#endif
|
|
|
+
|
|
|
+ // check if it is running or we are closing client
|
|
|
+ if (this.isRunning)
|
|
|
+ {
|
|
|
+ // get event from queue
|
|
|
+ InternalEvent internalEvent = null;
|
|
|
+ lock (this.eventQueue)
|
|
|
+ {
|
|
|
+ if (this.eventQueue.Count > 0)
|
|
|
+ internalEvent = (InternalEvent)this.eventQueue.Dequeue();
|
|
|
+ }
|
|
|
+
|
|
|
+ // it's an event with a message inside
|
|
|
+ if (internalEvent != null)
|
|
|
+ {
|
|
|
+ MqttMsgBase msg = ((MsgInternalEvent)internalEvent).Message;
|
|
|
+
|
|
|
+ if (msg != null)
|
|
|
+ {
|
|
|
+ switch (msg.Type)
|
|
|
+ {
|
|
|
+ // CONNECT message received
|
|
|
+ case MqttMsgBase.MQTT_MSG_CONNECT_TYPE:
|
|
|
+
|
|
|
+#if BROKER
|
|
|
+ // raise connected client event (CONNECT message received)
|
|
|
+ this.OnMqttMsgConnected((MqttMsgConnect)msg);
|
|
|
+ break;
|
|
|
+#else
|
|
|
+ throw new MqttClientException(MqttClientErrorCode.WrongBrokerMessage);
|
|
|
+#endif
|
|
|
+
|
|
|
+ // SUBSCRIBE message received
|
|
|
+ case MqttMsgBase.MQTT_MSG_SUBSCRIBE_TYPE:
|
|
|
+
|
|
|
+#if BROKER
|
|
|
+ MqttMsgSubscribe subscribe = (MqttMsgSubscribe)msg;
|
|
|
+ // raise subscribe topic event (SUBSCRIBE message received)
|
|
|
+ this.OnMqttMsgSubscribeReceived(subscribe.MessageId, subscribe.Topics, subscribe.QoSLevels);
|
|
|
+ break;
|
|
|
+#else
|
|
|
+ throw new MqttClientException(MqttClientErrorCode.WrongBrokerMessage);
|
|
|
+#endif
|
|
|
+
|
|
|
+ // SUBACK message received
|
|
|
+ case MqttMsgBase.MQTT_MSG_SUBACK_TYPE:
|
|
|
+
|
|
|
+ // raise subscribed topic event (SUBACK message received)
|
|
|
+ this.OnMqttMsgSubscribed((MqttMsgSuback)msg);
|
|
|
+ break;
|
|
|
+
|
|
|
+ // PUBLISH message received
|
|
|
+ case MqttMsgBase.MQTT_MSG_PUBLISH_TYPE:
|
|
|
+
|
|
|
+ // PUBLISH message received in a published internal event, no publish succeeded
|
|
|
+ if (internalEvent.GetType() == typeof(MsgPublishedInternalEvent))
|
|
|
+ this.OnMqttMsgPublished(msg.MessageId, false);
|
|
|
+ else
|
|
|
+ // raise PUBLISH message received event
|
|
|
+ this.OnMqttMsgPublishReceived((MqttMsgPublish)msg);
|
|
|
+ break;
|
|
|
+
|
|
|
+ // PUBACK message received
|
|
|
+ case MqttMsgBase.MQTT_MSG_PUBACK_TYPE:
|
|
|
+
|
|
|
+ // raise published message event
|
|
|
+ // (PUBACK received for QoS Level 1)
|
|
|
+ this.OnMqttMsgPublished(msg.MessageId, true);
|
|
|
+ break;
|
|
|
+
|
|
|
+ // PUBREL message received
|
|
|
+ case MqttMsgBase.MQTT_MSG_PUBREL_TYPE:
|
|
|
+
|
|
|
+ // raise message received event
|
|
|
+ // (PUBREL received for QoS Level 2)
|
|
|
+ this.OnMqttMsgPublishReceived((MqttMsgPublish)msg);
|
|
|
+ break;
|
|
|
+
|
|
|
+ // PUBCOMP message received
|
|
|
+ case MqttMsgBase.MQTT_MSG_PUBCOMP_TYPE:
|
|
|
+
|
|
|
+ // raise published message event
|
|
|
+ // (PUBCOMP received for QoS Level 2)
|
|
|
+ this.OnMqttMsgPublished(msg.MessageId, true);
|
|
|
+ break;
|
|
|
+
|
|
|
+ // UNSUBSCRIBE message received from client
|
|
|
+ case MqttMsgBase.MQTT_MSG_UNSUBSCRIBE_TYPE:
|
|
|
+
|
|
|
+#if BROKER
|
|
|
+ MqttMsgUnsubscribe unsubscribe = (MqttMsgUnsubscribe)msg;
|
|
|
+ // raise unsubscribe topic event (UNSUBSCRIBE message received)
|
|
|
+ this.OnMqttMsgUnsubscribeReceived(unsubscribe.MessageId, unsubscribe.Topics);
|
|
|
+ break;
|
|
|
+#else
|
|
|
+ throw new MqttClientException(MqttClientErrorCode.WrongBrokerMessage);
|
|
|
+#endif
|
|
|
+
|
|
|
+ // UNSUBACK message received
|
|
|
+ case MqttMsgBase.MQTT_MSG_UNSUBACK_TYPE:
|
|
|
+
|
|
|
+ // raise unsubscribed topic event
|
|
|
+ this.OnMqttMsgUnsubscribed(msg.MessageId);
|
|
|
+ break;
|
|
|
+
|
|
|
+ // DISCONNECT message received from client
|
|
|
+ case MqttMsgDisconnect.MQTT_MSG_DISCONNECT_TYPE:
|
|
|
+
|
|
|
+#if BROKER
|
|
|
+ // raise disconnected client event (DISCONNECT message received)
|
|
|
+ this.OnMqttMsgDisconnected();
|
|
|
+ break;
|
|
|
+#else
|
|
|
+ throw new MqttClientException(MqttClientErrorCode.WrongBrokerMessage);
|
|
|
+#endif
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // all events for received messages dispatched, check if there is closing connection
|
|
|
+ if ((this.eventQueue.Count == 0) && this.isConnectionClosing)
|
|
|
+ {
|
|
|
+ // client must close connection
|
|
|
+ this.Close();
|
|
|
+
|
|
|
+ // client raw disconnection
|
|
|
+ this.OnConnectionClosed();
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Process inflight messages queue
|
|
|
+ /// </summary>
|
|
|
+ private void ProcessInflightThread()
|
|
|
+ {
|
|
|
+ MqttMsgContext msgContext = null;
|
|
|
+ MqttMsgBase msgInflight = null;
|
|
|
+ MqttMsgBase msgReceived = null;
|
|
|
+ InternalEvent internalEvent = null;
|
|
|
+ bool acknowledge = false;
|
|
|
+ int timeout = Timeout.Infinite;
|
|
|
+ int delta;
|
|
|
+ bool msgReceivedProcessed = false;
|
|
|
+
|
|
|
+ try
|
|
|
+ {
|
|
|
+ while (this.isRunning)
|
|
|
+ {
|
|
|
+#if (MF_FRAMEWORK_VERSION_V4_2 || MF_FRAMEWORK_VERSION_V4_3 || COMPACT_FRAMEWORK)
|
|
|
+ // wait on message queueud to inflight
|
|
|
+ this.inflightWaitHandle.WaitOne(timeout, false);
|
|
|
+#else
|
|
|
+ // wait on message queueud to inflight
|
|
|
+ this.inflightWaitHandle.WaitOne(timeout);
|
|
|
+#endif
|
|
|
+
|
|
|
+ // it could be unblocked because Close() method is joining
|
|
|
+ if (this.isRunning)
|
|
|
+ {
|
|
|
+ lock (this.inflightQueue)
|
|
|
+ {
|
|
|
+ // message received and peeked from internal queue is processed
|
|
|
+ // NOTE : it has the corresponding message in inflight queue based on messageId
|
|
|
+ // (ex. a PUBREC for a PUBLISH, a SUBACK for a SUBSCRIBE, ...)
|
|
|
+ // if it's orphan we need to remove from internal queue
|
|
|
+ msgReceivedProcessed = false;
|
|
|
+ acknowledge = false;
|
|
|
+ msgReceived = null;
|
|
|
+
|
|
|
+ // set timeout tu MaxValue instead of Infinte (-1) to perform
|
|
|
+ // compare with calcultad current msgTimeout
|
|
|
+ timeout = Int32.MaxValue;
|
|
|
+
|
|
|
+ // a message inflight could be re-enqueued but we have to
|
|
|
+ // analyze it only just one time for cycle
|
|
|
+ int count = this.inflightQueue.Count;
|
|
|
+ // process all inflight queued messages
|
|
|
+ while (count > 0)
|
|
|
+ {
|
|
|
+ count--;
|
|
|
+ acknowledge = false;
|
|
|
+ msgReceived = null;
|
|
|
+
|
|
|
+ // check to be sure that client isn't closing and all queues are now empty !
|
|
|
+ if (!this.isRunning)
|
|
|
+ break;
|
|
|
+
|
|
|
+ // dequeue message context from queue
|
|
|
+ msgContext = (MqttMsgContext)this.inflightQueue.Dequeue();
|
|
|
+
|
|
|
+ // get inflight message
|
|
|
+ msgInflight = (MqttMsgBase)msgContext.Message;
|
|
|
+
|
|
|
+ switch (msgContext.State)
|
|
|
+ {
|
|
|
+ case MqttMsgState.QueuedQos0:
|
|
|
+
|
|
|
+ // QoS 0, PUBLISH message to send to broker, no state change, no acknowledge
|
|
|
+ if (msgContext.Flow == MqttMsgFlow.ToPublish)
|
|
|
+ {
|
|
|
+ this.Send(msgInflight);
|
|
|
+ }
|
|
|
+ // QoS 0, no need acknowledge
|
|
|
+ else if (msgContext.Flow == MqttMsgFlow.ToAcknowledge)
|
|
|
+ {
|
|
|
+ internalEvent = new MsgInternalEvent(msgInflight);
|
|
|
+ // notify published message from broker (no need acknowledged)
|
|
|
+ this.OnInternalEvent(internalEvent);
|
|
|
+ }
|
|
|
+
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Queuing, "processed {0}", msgInflight);
|
|
|
+#endif
|
|
|
+ break;
|
|
|
+
|
|
|
+ case MqttMsgState.QueuedQos1:
|
|
|
+ // [v3.1.1] SUBSCRIBE and UNSIBSCRIBE aren't "officially" QOS = 1
|
|
|
+ case MqttMsgState.SendSubscribe:
|
|
|
+ case MqttMsgState.SendUnsubscribe:
|
|
|
+
|
|
|
+ // QoS 1, PUBLISH or SUBSCRIBE/UNSUBSCRIBE message to send to broker, state change to wait PUBACK or SUBACK/UNSUBACK
|
|
|
+ if (msgContext.Flow == MqttMsgFlow.ToPublish)
|
|
|
+ {
|
|
|
+ msgContext.Timestamp = Environment.TickCount;
|
|
|
+ msgContext.Attempt++;
|
|
|
+
|
|
|
+ if (msgInflight.Type == MqttMsgBase.MQTT_MSG_PUBLISH_TYPE)
|
|
|
+ {
|
|
|
+ // PUBLISH message to send, wait for PUBACK
|
|
|
+ msgContext.State = MqttMsgState.WaitForPuback;
|
|
|
+ // retry ? set dup flag [v3.1.1] only for PUBLISH message
|
|
|
+ if (msgContext.Attempt > 1)
|
|
|
+ msgInflight.DupFlag = true;
|
|
|
+ }
|
|
|
+ else if (msgInflight.Type == MqttMsgBase.MQTT_MSG_SUBSCRIBE_TYPE)
|
|
|
+ // SUBSCRIBE message to send, wait for SUBACK
|
|
|
+ msgContext.State = MqttMsgState.WaitForSuback;
|
|
|
+ else if (msgInflight.Type == MqttMsgBase.MQTT_MSG_UNSUBSCRIBE_TYPE)
|
|
|
+ // UNSUBSCRIBE message to send, wait for UNSUBACK
|
|
|
+ msgContext.State = MqttMsgState.WaitForUnsuback;
|
|
|
+
|
|
|
+ this.Send(msgInflight);
|
|
|
+
|
|
|
+ // update timeout : minimum between delay (based on current message sent) or current timeout
|
|
|
+ timeout = (this.settings.DelayOnRetry < timeout) ? this.settings.DelayOnRetry : timeout;
|
|
|
+
|
|
|
+ // re-enqueue message (I have to re-analyze for receiving PUBACK, SUBACK or UNSUBACK)
|
|
|
+ this.inflightQueue.Enqueue(msgContext);
|
|
|
+ }
|
|
|
+ // QoS 1, PUBLISH message received from broker to acknowledge, send PUBACK
|
|
|
+ else if (msgContext.Flow == MqttMsgFlow.ToAcknowledge)
|
|
|
+ {
|
|
|
+ MqttMsgPuback puback = new MqttMsgPuback();
|
|
|
+ puback.MessageId = msgInflight.MessageId;
|
|
|
+
|
|
|
+ this.Send(puback);
|
|
|
+
|
|
|
+ internalEvent = new MsgInternalEvent(msgInflight);
|
|
|
+ // notify published message from broker and acknowledged
|
|
|
+ this.OnInternalEvent(internalEvent);
|
|
|
+
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Queuing, "processed {0}", msgInflight);
|
|
|
+#endif
|
|
|
+ }
|
|
|
+ break;
|
|
|
+
|
|
|
+ case MqttMsgState.QueuedQos2:
|
|
|
+
|
|
|
+ // QoS 2, PUBLISH message to send to broker, state change to wait PUBREC
|
|
|
+ if (msgContext.Flow == MqttMsgFlow.ToPublish)
|
|
|
+ {
|
|
|
+ msgContext.Timestamp = Environment.TickCount;
|
|
|
+ msgContext.Attempt++;
|
|
|
+ msgContext.State = MqttMsgState.WaitForPubrec;
|
|
|
+ // retry ? set dup flag
|
|
|
+ if (msgContext.Attempt > 1)
|
|
|
+ msgInflight.DupFlag = true;
|
|
|
+
|
|
|
+ this.Send(msgInflight);
|
|
|
+
|
|
|
+ // update timeout : minimum between delay (based on current message sent) or current timeout
|
|
|
+ timeout = (this.settings.DelayOnRetry < timeout) ? this.settings.DelayOnRetry : timeout;
|
|
|
+
|
|
|
+ // re-enqueue message (I have to re-analyze for receiving PUBREC)
|
|
|
+ this.inflightQueue.Enqueue(msgContext);
|
|
|
+ }
|
|
|
+ // QoS 2, PUBLISH message received from broker to acknowledge, send PUBREC, state change to wait PUBREL
|
|
|
+ else if (msgContext.Flow == MqttMsgFlow.ToAcknowledge)
|
|
|
+ {
|
|
|
+ MqttMsgPubrec pubrec = new MqttMsgPubrec();
|
|
|
+ pubrec.MessageId = msgInflight.MessageId;
|
|
|
+
|
|
|
+ msgContext.State = MqttMsgState.WaitForPubrel;
|
|
|
+
|
|
|
+ this.Send(pubrec);
|
|
|
+
|
|
|
+ // re-enqueue message (I have to re-analyze for receiving PUBREL)
|
|
|
+ this.inflightQueue.Enqueue(msgContext);
|
|
|
+ }
|
|
|
+ break;
|
|
|
+
|
|
|
+ case MqttMsgState.WaitForPuback:
|
|
|
+ case MqttMsgState.WaitForSuback:
|
|
|
+ case MqttMsgState.WaitForUnsuback:
|
|
|
+
|
|
|
+ // QoS 1, waiting for PUBACK of a PUBLISH message sent or
|
|
|
+ // waiting for SUBACK of a SUBSCRIBE message sent or
|
|
|
+ // waiting for UNSUBACK of a UNSUBSCRIBE message sent or
|
|
|
+ if (msgContext.Flow == MqttMsgFlow.ToPublish)
|
|
|
+ {
|
|
|
+ acknowledge = false;
|
|
|
+ lock (this.internalQueue)
|
|
|
+ {
|
|
|
+ if (this.internalQueue.Count > 0)
|
|
|
+ msgReceived = (MqttMsgBase)this.internalQueue.Peek();
|
|
|
+ }
|
|
|
+
|
|
|
+ // it is a PUBACK message or a SUBACK/UNSUBACK message
|
|
|
+ if (msgReceived != null)
|
|
|
+ {
|
|
|
+ // PUBACK message or SUBACK/UNSUBACK message for the current message
|
|
|
+ if (((msgReceived.Type == MqttMsgBase.MQTT_MSG_PUBACK_TYPE) && (msgInflight.Type == MqttMsgBase.MQTT_MSG_PUBLISH_TYPE) && (msgReceived.MessageId == msgInflight.MessageId)) ||
|
|
|
+ ((msgReceived.Type == MqttMsgBase.MQTT_MSG_SUBACK_TYPE) && (msgInflight.Type == MqttMsgBase.MQTT_MSG_SUBSCRIBE_TYPE) && (msgReceived.MessageId == msgInflight.MessageId)) ||
|
|
|
+ ((msgReceived.Type == MqttMsgBase.MQTT_MSG_UNSUBACK_TYPE) && (msgInflight.Type == MqttMsgBase.MQTT_MSG_UNSUBSCRIBE_TYPE) && (msgReceived.MessageId == msgInflight.MessageId)))
|
|
|
+ {
|
|
|
+ lock (this.internalQueue)
|
|
|
+ {
|
|
|
+ // received message processed
|
|
|
+ this.internalQueue.Dequeue();
|
|
|
+ acknowledge = true;
|
|
|
+ msgReceivedProcessed = true;
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Queuing, "dequeued {0}", msgReceived);
|
|
|
+#endif
|
|
|
+ }
|
|
|
+
|
|
|
+ // if PUBACK received, confirm published with flag
|
|
|
+ if (msgReceived.Type == MqttMsgBase.MQTT_MSG_PUBACK_TYPE)
|
|
|
+ internalEvent = new MsgPublishedInternalEvent(msgReceived, true);
|
|
|
+ else
|
|
|
+ internalEvent = new MsgInternalEvent(msgReceived);
|
|
|
+
|
|
|
+ // notify received acknowledge from broker of a published message or subscribe/unsubscribe message
|
|
|
+ this.OnInternalEvent(internalEvent);
|
|
|
+
|
|
|
+ // PUBACK received for PUBLISH message with QoS Level 1, remove from session state
|
|
|
+ if ((msgInflight.Type == MqttMsgBase.MQTT_MSG_PUBLISH_TYPE) &&
|
|
|
+ (this.session != null) &&
|
|
|
+#if (MF_FRAMEWORK_VERSION_V4_2 || MF_FRAMEWORK_VERSION_V4_3 || COMPACT_FRAMEWORK)
|
|
|
+ (this.session.InflightMessages.Contains(msgContext.Key)))
|
|
|
+#else
|
|
|
+ (this.session.InflightMessages.ContainsKey(msgContext.Key)))
|
|
|
+#endif
|
|
|
+ {
|
|
|
+ this.session.InflightMessages.Remove(msgContext.Key);
|
|
|
+ }
|
|
|
+
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Queuing, "processed {0}", msgInflight);
|
|
|
+#endif
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // current message not acknowledged, no PUBACK or SUBACK/UNSUBACK or not equal messageid
|
|
|
+ if (!acknowledge)
|
|
|
+ {
|
|
|
+ delta = Environment.TickCount - msgContext.Timestamp;
|
|
|
+ // check timeout for receiving PUBACK since PUBLISH was sent or
|
|
|
+ // for receiving SUBACK since SUBSCRIBE was sent or
|
|
|
+ // for receiving UNSUBACK since UNSUBSCRIBE was sent
|
|
|
+ if (delta >= this.settings.DelayOnRetry)
|
|
|
+ {
|
|
|
+ // max retry not reached, resend
|
|
|
+ if (msgContext.Attempt < this.settings.AttemptsOnRetry)
|
|
|
+ {
|
|
|
+ msgContext.State = MqttMsgState.QueuedQos1;
|
|
|
+
|
|
|
+ // re-enqueue message
|
|
|
+ this.inflightQueue.Enqueue(msgContext);
|
|
|
+
|
|
|
+ // update timeout (0 -> reanalyze queue immediately)
|
|
|
+ timeout = 0;
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ // if PUBACK for a PUBLISH message not received after retries, raise event for not published
|
|
|
+ if (msgInflight.Type == MqttMsgBase.MQTT_MSG_PUBLISH_TYPE)
|
|
|
+ {
|
|
|
+ // PUBACK not received in time, PUBLISH retries failed, need to remove from session inflight messages too
|
|
|
+ if ((this.session != null) &&
|
|
|
+#if (MF_FRAMEWORK_VERSION_V4_2 || MF_FRAMEWORK_VERSION_V4_3 || COMPACT_FRAMEWORK)
|
|
|
+ (this.session.InflightMessages.Contains(msgContext.Key)))
|
|
|
+#else
|
|
|
+ (this.session.InflightMessages.ContainsKey(msgContext.Key)))
|
|
|
+#endif
|
|
|
+ {
|
|
|
+ this.session.InflightMessages.Remove(msgContext.Key);
|
|
|
+ }
|
|
|
+
|
|
|
+ internalEvent = new MsgPublishedInternalEvent(msgInflight, false);
|
|
|
+
|
|
|
+ // notify not received acknowledge from broker and message not published
|
|
|
+ this.OnInternalEvent(internalEvent);
|
|
|
+ }
|
|
|
+ // NOTE : not raise events for SUBACK or UNSUBACK not received
|
|
|
+ // for the user no event raised means subscribe/unsubscribe failed
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ // re-enqueue message (I have to re-analyze for receiving PUBACK, SUBACK or UNSUBACK)
|
|
|
+ this.inflightQueue.Enqueue(msgContext);
|
|
|
+
|
|
|
+ // update timeout
|
|
|
+ int msgTimeout = (this.settings.DelayOnRetry - delta);
|
|
|
+ timeout = (msgTimeout < timeout) ? msgTimeout : timeout;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ break;
|
|
|
+
|
|
|
+ case MqttMsgState.WaitForPubrec:
|
|
|
+
|
|
|
+ // QoS 2, waiting for PUBREC of a PUBLISH message sent
|
|
|
+ if (msgContext.Flow == MqttMsgFlow.ToPublish)
|
|
|
+ {
|
|
|
+ acknowledge = false;
|
|
|
+ lock (this.internalQueue)
|
|
|
+ {
|
|
|
+ if (this.internalQueue.Count > 0)
|
|
|
+ msgReceived = (MqttMsgBase)this.internalQueue.Peek();
|
|
|
+ }
|
|
|
+
|
|
|
+ // it is a PUBREC message
|
|
|
+ if ((msgReceived != null) && (msgReceived.Type == MqttMsgBase.MQTT_MSG_PUBREC_TYPE))
|
|
|
+ {
|
|
|
+ // PUBREC message for the current PUBLISH message, send PUBREL, wait for PUBCOMP
|
|
|
+ if (msgReceived.MessageId == msgInflight.MessageId)
|
|
|
+ {
|
|
|
+ lock (this.internalQueue)
|
|
|
+ {
|
|
|
+ // received message processed
|
|
|
+ this.internalQueue.Dequeue();
|
|
|
+ acknowledge = true;
|
|
|
+ msgReceivedProcessed = true;
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Queuing, "dequeued {0}", msgReceived);
|
|
|
+#endif
|
|
|
+ }
|
|
|
+
|
|
|
+ MqttMsgPubrel pubrel = new MqttMsgPubrel();
|
|
|
+ pubrel.MessageId = msgInflight.MessageId;
|
|
|
+
|
|
|
+ msgContext.State = MqttMsgState.WaitForPubcomp;
|
|
|
+ msgContext.Timestamp = Environment.TickCount;
|
|
|
+ msgContext.Attempt = 1;
|
|
|
+
|
|
|
+ this.Send(pubrel);
|
|
|
+
|
|
|
+ // update timeout : minimum between delay (based on current message sent) or current timeout
|
|
|
+ timeout = (this.settings.DelayOnRetry < timeout) ? this.settings.DelayOnRetry : timeout;
|
|
|
+
|
|
|
+ // re-enqueue message
|
|
|
+ this.inflightQueue.Enqueue(msgContext);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // current message not acknowledged
|
|
|
+ if (!acknowledge)
|
|
|
+ {
|
|
|
+ delta = Environment.TickCount - msgContext.Timestamp;
|
|
|
+ // check timeout for receiving PUBREC since PUBLISH was sent
|
|
|
+ if (delta >= this.settings.DelayOnRetry)
|
|
|
+ {
|
|
|
+ // max retry not reached, resend
|
|
|
+ if (msgContext.Attempt < this.settings.AttemptsOnRetry)
|
|
|
+ {
|
|
|
+ msgContext.State = MqttMsgState.QueuedQos2;
|
|
|
+
|
|
|
+ // re-enqueue message
|
|
|
+ this.inflightQueue.Enqueue(msgContext);
|
|
|
+
|
|
|
+ // update timeout (0 -> reanalyze queue immediately)
|
|
|
+ timeout = 0;
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ // PUBREC not received in time, PUBLISH retries failed, need to remove from session inflight messages too
|
|
|
+ if ((this.session != null) &&
|
|
|
+#if (MF_FRAMEWORK_VERSION_V4_2 || MF_FRAMEWORK_VERSION_V4_3 || COMPACT_FRAMEWORK)
|
|
|
+ (this.session.InflightMessages.Contains(msgContext.Key)))
|
|
|
+#else
|
|
|
+ (this.session.InflightMessages.ContainsKey(msgContext.Key)))
|
|
|
+#endif
|
|
|
+ {
|
|
|
+ this.session.InflightMessages.Remove(msgContext.Key);
|
|
|
+ }
|
|
|
+
|
|
|
+ // if PUBREC for a PUBLISH message not received after retries, raise event for not published
|
|
|
+ internalEvent = new MsgPublishedInternalEvent(msgInflight, false);
|
|
|
+ // notify not received acknowledge from broker and message not published
|
|
|
+ this.OnInternalEvent(internalEvent);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ // re-enqueue message
|
|
|
+ this.inflightQueue.Enqueue(msgContext);
|
|
|
+
|
|
|
+ // update timeout
|
|
|
+ int msgTimeout = (this.settings.DelayOnRetry - delta);
|
|
|
+ timeout = (msgTimeout < timeout) ? msgTimeout : timeout;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ break;
|
|
|
+
|
|
|
+ case MqttMsgState.WaitForPubrel:
|
|
|
+
|
|
|
+ // QoS 2, waiting for PUBREL of a PUBREC message sent
|
|
|
+ if (msgContext.Flow == MqttMsgFlow.ToAcknowledge)
|
|
|
+ {
|
|
|
+ lock (this.internalQueue)
|
|
|
+ {
|
|
|
+ if (this.internalQueue.Count > 0)
|
|
|
+ msgReceived = (MqttMsgBase)this.internalQueue.Peek();
|
|
|
+ }
|
|
|
+
|
|
|
+ // it is a PUBREL message
|
|
|
+ if ((msgReceived != null) && (msgReceived.Type == MqttMsgBase.MQTT_MSG_PUBREL_TYPE))
|
|
|
+ {
|
|
|
+ // PUBREL message for the current message, send PUBCOMP
|
|
|
+ if (msgReceived.MessageId == msgInflight.MessageId)
|
|
|
+ {
|
|
|
+ lock (this.internalQueue)
|
|
|
+ {
|
|
|
+ // received message processed
|
|
|
+ this.internalQueue.Dequeue();
|
|
|
+ msgReceivedProcessed = true;
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Queuing, "dequeued {0}", msgReceived);
|
|
|
+#endif
|
|
|
+ }
|
|
|
+
|
|
|
+ MqttMsgPubcomp pubcomp = new MqttMsgPubcomp();
|
|
|
+ pubcomp.MessageId = msgInflight.MessageId;
|
|
|
+
|
|
|
+ this.Send(pubcomp);
|
|
|
+
|
|
|
+ internalEvent = new MsgInternalEvent(msgInflight);
|
|
|
+ // notify published message from broker and acknowledged
|
|
|
+ this.OnInternalEvent(internalEvent);
|
|
|
+
|
|
|
+ // PUBREL received (and PUBCOMP sent) for PUBLISH message with QoS Level 2, remove from session state
|
|
|
+ if ((msgInflight.Type == MqttMsgBase.MQTT_MSG_PUBLISH_TYPE) &&
|
|
|
+ (this.session != null) &&
|
|
|
+#if (MF_FRAMEWORK_VERSION_V4_2 || MF_FRAMEWORK_VERSION_V4_3 || COMPACT_FRAMEWORK)
|
|
|
+ (this.session.InflightMessages.Contains(msgContext.Key)))
|
|
|
+#else
|
|
|
+ (this.session.InflightMessages.ContainsKey(msgContext.Key)))
|
|
|
+#endif
|
|
|
+ {
|
|
|
+ this.session.InflightMessages.Remove(msgContext.Key);
|
|
|
+ }
|
|
|
+
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Queuing, "processed {0}", msgInflight);
|
|
|
+#endif
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ // re-enqueue message
|
|
|
+ this.inflightQueue.Enqueue(msgContext);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ // re-enqueue message
|
|
|
+ this.inflightQueue.Enqueue(msgContext);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ break;
|
|
|
+
|
|
|
+ case MqttMsgState.WaitForPubcomp:
|
|
|
+
|
|
|
+ // QoS 2, waiting for PUBCOMP of a PUBREL message sent
|
|
|
+ if (msgContext.Flow == MqttMsgFlow.ToPublish)
|
|
|
+ {
|
|
|
+ acknowledge = false;
|
|
|
+ lock (this.internalQueue)
|
|
|
+ {
|
|
|
+ if (this.internalQueue.Count > 0)
|
|
|
+ msgReceived = (MqttMsgBase)this.internalQueue.Peek();
|
|
|
+ }
|
|
|
+
|
|
|
+ // it is a PUBCOMP message
|
|
|
+ if ((msgReceived != null) && (msgReceived.Type == MqttMsgBase.MQTT_MSG_PUBCOMP_TYPE))
|
|
|
+ {
|
|
|
+ // PUBCOMP message for the current message
|
|
|
+ if (msgReceived.MessageId == msgInflight.MessageId)
|
|
|
+ {
|
|
|
+ lock (this.internalQueue)
|
|
|
+ {
|
|
|
+ // received message processed
|
|
|
+ this.internalQueue.Dequeue();
|
|
|
+ acknowledge = true;
|
|
|
+ msgReceivedProcessed = true;
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Queuing, "dequeued {0}", msgReceived);
|
|
|
+#endif
|
|
|
+ }
|
|
|
+
|
|
|
+ internalEvent = new MsgPublishedInternalEvent(msgReceived, true);
|
|
|
+ // notify received acknowledge from broker of a published message
|
|
|
+ this.OnInternalEvent(internalEvent);
|
|
|
+
|
|
|
+ // PUBCOMP received for PUBLISH message with QoS Level 2, remove from session state
|
|
|
+ if ((msgInflight.Type == MqttMsgBase.MQTT_MSG_PUBLISH_TYPE) &&
|
|
|
+ (this.session != null) &&
|
|
|
+#if (MF_FRAMEWORK_VERSION_V4_2 || MF_FRAMEWORK_VERSION_V4_3 || COMPACT_FRAMEWORK)
|
|
|
+ (this.session.InflightMessages.Contains(msgContext.Key)))
|
|
|
+#else
|
|
|
+ (this.session.InflightMessages.ContainsKey(msgContext.Key)))
|
|
|
+#endif
|
|
|
+ {
|
|
|
+ this.session.InflightMessages.Remove(msgContext.Key);
|
|
|
+ }
|
|
|
+
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Queuing, "processed {0}", msgInflight);
|
|
|
+#endif
|
|
|
+ }
|
|
|
+ }
|
|
|
+ // it is a PUBREC message
|
|
|
+ else if ((msgReceived != null) && (msgReceived.Type == MqttMsgBase.MQTT_MSG_PUBREC_TYPE))
|
|
|
+ {
|
|
|
+ // another PUBREC message for the current message due to a retransmitted PUBLISH
|
|
|
+ // I'm in waiting for PUBCOMP, so I can discard this PUBREC
|
|
|
+ if (msgReceived.MessageId == msgInflight.MessageId)
|
|
|
+ {
|
|
|
+ lock (this.internalQueue)
|
|
|
+ {
|
|
|
+ // received message processed
|
|
|
+ this.internalQueue.Dequeue();
|
|
|
+ acknowledge = true;
|
|
|
+ msgReceivedProcessed = true;
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Queuing, "dequeued {0}", msgReceived);
|
|
|
+#endif
|
|
|
+
|
|
|
+ // re-enqueue message
|
|
|
+ this.inflightQueue.Enqueue(msgContext);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // current message not acknowledged
|
|
|
+ if (!acknowledge)
|
|
|
+ {
|
|
|
+ delta = Environment.TickCount - msgContext.Timestamp;
|
|
|
+ // check timeout for receiving PUBCOMP since PUBREL was sent
|
|
|
+ if (delta >= this.settings.DelayOnRetry)
|
|
|
+ {
|
|
|
+ // max retry not reached, resend
|
|
|
+ if (msgContext.Attempt < this.settings.AttemptsOnRetry)
|
|
|
+ {
|
|
|
+ msgContext.State = MqttMsgState.SendPubrel;
|
|
|
+
|
|
|
+ // re-enqueue message
|
|
|
+ this.inflightQueue.Enqueue(msgContext);
|
|
|
+
|
|
|
+ // update timeout (0 -> reanalyze queue immediately)
|
|
|
+ timeout = 0;
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ // PUBCOMP not received, PUBREL retries failed, need to remove from session inflight messages too
|
|
|
+ if ((this.session != null) &&
|
|
|
+#if (MF_FRAMEWORK_VERSION_V4_2 || MF_FRAMEWORK_VERSION_V4_3 || COMPACT_FRAMEWORK)
|
|
|
+ (this.session.InflightMessages.Contains(msgContext.Key)))
|
|
|
+#else
|
|
|
+ (this.session.InflightMessages.ContainsKey(msgContext.Key)))
|
|
|
+#endif
|
|
|
+ {
|
|
|
+ this.session.InflightMessages.Remove(msgContext.Key);
|
|
|
+ }
|
|
|
+
|
|
|
+ // if PUBCOMP for a PUBLISH message not received after retries, raise event for not published
|
|
|
+ internalEvent = new MsgPublishedInternalEvent(msgInflight, false);
|
|
|
+ // notify not received acknowledge from broker and message not published
|
|
|
+ this.OnInternalEvent(internalEvent);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ // re-enqueue message
|
|
|
+ this.inflightQueue.Enqueue(msgContext);
|
|
|
+
|
|
|
+ // update timeout
|
|
|
+ int msgTimeout = (this.settings.DelayOnRetry - delta);
|
|
|
+ timeout = (msgTimeout < timeout) ? msgTimeout : timeout;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ break;
|
|
|
+
|
|
|
+ case MqttMsgState.SendPubrec:
|
|
|
+
|
|
|
+ // TODO : impossible ? --> QueuedQos2 ToAcknowledge
|
|
|
+ break;
|
|
|
+
|
|
|
+ case MqttMsgState.SendPubrel:
|
|
|
+
|
|
|
+ // QoS 2, PUBREL message to send to broker, state change to wait PUBCOMP
|
|
|
+ if (msgContext.Flow == MqttMsgFlow.ToPublish)
|
|
|
+ {
|
|
|
+ MqttMsgPubrel pubrel = new MqttMsgPubrel();
|
|
|
+ pubrel.MessageId = msgInflight.MessageId;
|
|
|
+
|
|
|
+ msgContext.State = MqttMsgState.WaitForPubcomp;
|
|
|
+ msgContext.Timestamp = Environment.TickCount;
|
|
|
+ msgContext.Attempt++;
|
|
|
+ // retry ? set dup flag [v3.1.1] no needed
|
|
|
+ if (this.ProtocolVersion == MqttProtocolVersion.Version_3_1)
|
|
|
+ {
|
|
|
+ if (msgContext.Attempt > 1)
|
|
|
+ pubrel.DupFlag = true;
|
|
|
+ }
|
|
|
+
|
|
|
+ this.Send(pubrel);
|
|
|
+
|
|
|
+ // update timeout : minimum between delay (based on current message sent) or current timeout
|
|
|
+ timeout = (this.settings.DelayOnRetry < timeout) ? this.settings.DelayOnRetry : timeout;
|
|
|
+
|
|
|
+ // re-enqueue message
|
|
|
+ this.inflightQueue.Enqueue(msgContext);
|
|
|
+ }
|
|
|
+ break;
|
|
|
+
|
|
|
+ case MqttMsgState.SendPubcomp:
|
|
|
+ // TODO : impossible ?
|
|
|
+ break;
|
|
|
+ case MqttMsgState.SendPuback:
|
|
|
+ // TODO : impossible ? --> QueuedQos1 ToAcknowledge
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // if calculated timeout is MaxValue, it means that must be Infinite (-1)
|
|
|
+ if (timeout == Int32.MaxValue)
|
|
|
+ timeout = Timeout.Infinite;
|
|
|
+
|
|
|
+ // if message received is orphan, no corresponding message in inflight queue
|
|
|
+ // based on messageId, we need to remove from the queue
|
|
|
+ if ((msgReceived != null) && !msgReceivedProcessed)
|
|
|
+ {
|
|
|
+ this.internalQueue.Dequeue();
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Queuing, "dequeued {0} orphan", msgReceived);
|
|
|
+#endif
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ catch (MqttCommunicationException e)
|
|
|
+ {
|
|
|
+ // possible exception on Send, I need to re-enqueue not sent message
|
|
|
+ if (msgContext != null)
|
|
|
+ // re-enqueue message
|
|
|
+ this.inflightQueue.Enqueue(msgContext);
|
|
|
+
|
|
|
+#if TRACE
|
|
|
+ MqttUtility.Trace.WriteLine(TraceLevel.Error, "Exception occurred: {0}", e.ToString());
|
|
|
+#endif
|
|
|
+
|
|
|
+ // raise disconnection client event
|
|
|
+ this.OnConnectionClosing();
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Restore session
|
|
|
+ /// </summary>
|
|
|
+ private void RestoreSession()
|
|
|
+ {
|
|
|
+ // if not clean session
|
|
|
+ if (!this.CleanSession)
|
|
|
+ {
|
|
|
+ // there is a previous session
|
|
|
+ if (this.session != null)
|
|
|
+ {
|
|
|
+ lock (this.inflightQueue)
|
|
|
+ {
|
|
|
+ foreach (MqttMsgContext msgContext in this.session.InflightMessages.Values)
|
|
|
+ {
|
|
|
+ this.inflightQueue.Enqueue(msgContext);
|
|
|
+
|
|
|
+ // if it is a PUBLISH message to publish
|
|
|
+ if ((msgContext.Message.Type == MqttMsgBase.MQTT_MSG_PUBLISH_TYPE) &&
|
|
|
+ (msgContext.Flow == MqttMsgFlow.ToPublish))
|
|
|
+ {
|
|
|
+ // it's QoS 1 and we haven't received PUBACK
|
|
|
+ if ((msgContext.Message.QosLevel == MqttMsgBase.QOS_LEVEL_AT_LEAST_ONCE) &&
|
|
|
+ (msgContext.State == MqttMsgState.WaitForPuback))
|
|
|
+ {
|
|
|
+ // we haven't received PUBACK, we need to resend PUBLISH message
|
|
|
+ msgContext.State = MqttMsgState.QueuedQos1;
|
|
|
+ }
|
|
|
+ // it's QoS 2
|
|
|
+ else if (msgContext.Message.QosLevel == MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE)
|
|
|
+ {
|
|
|
+ // we haven't received PUBREC, we need to resend PUBLISH message
|
|
|
+ if (msgContext.State == MqttMsgState.WaitForPubrec)
|
|
|
+ {
|
|
|
+ msgContext.State = MqttMsgState.QueuedQos2;
|
|
|
+ }
|
|
|
+ // we haven't received PUBCOMP, we need to resend PUBREL for it
|
|
|
+ else if (msgContext.State == MqttMsgState.WaitForPubcomp)
|
|
|
+ {
|
|
|
+ msgContext.State = MqttMsgState.SendPubrel;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // unlock process inflight queue
|
|
|
+ this.inflightWaitHandle.Set();
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ // create new session
|
|
|
+ this.session = new MqttClientSession(this.ClientId);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ // clean any previous session
|
|
|
+ else
|
|
|
+ {
|
|
|
+ if (this.session != null)
|
|
|
+ this.session.Clear();
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+#if BROKER
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Load a given session
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="session">MQTT Client session to load</param>
|
|
|
+ public void LoadSession(MqttClientSession session)
|
|
|
+ {
|
|
|
+ // if not clean session
|
|
|
+ if (!this.CleanSession)
|
|
|
+ {
|
|
|
+ // set the session ...
|
|
|
+ this.session = session;
|
|
|
+ // ... and restore it
|
|
|
+ this.RestoreSession();
|
|
|
+ }
|
|
|
+ }
|
|
|
+#endif
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Generate the next message identifier
|
|
|
+ /// </summary>
|
|
|
+ /// <returns>Message identifier</returns>
|
|
|
+ private ushort GetMessageId()
|
|
|
+ {
|
|
|
+ // if 0 or max UInt16, it becomes 1 (first valid messageId)
|
|
|
+ this.messageIdCounter = ((this.messageIdCounter % UInt16.MaxValue) != 0) ? (ushort)(this.messageIdCounter + 1) : (ushort)1;
|
|
|
+ return this.messageIdCounter;
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Finder class for PUBLISH message inside a queue
|
|
|
+ /// </summary>
|
|
|
+ internal class MqttMsgContextFinder
|
|
|
+ {
|
|
|
+ // PUBLISH message id
|
|
|
+ internal ushort MessageId { get; set; }
|
|
|
+ // message flow into inflight queue
|
|
|
+ internal MqttMsgFlow Flow { get; set; }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// Constructor
|
|
|
+ /// </summary>
|
|
|
+ /// <param name="messageId">Message Id</param>
|
|
|
+ /// <param name="flow">Message flow inside inflight queue</param>
|
|
|
+ internal MqttMsgContextFinder(ushort messageId, MqttMsgFlow flow)
|
|
|
+ {
|
|
|
+ this.MessageId = messageId;
|
|
|
+ this.Flow = flow;
|
|
|
+ }
|
|
|
+
|
|
|
+ internal bool Find(object item)
|
|
|
+ {
|
|
|
+ MqttMsgContext msgCtx = (MqttMsgContext)item;
|
|
|
+ return ((msgCtx.Message.Type == MqttMsgBase.MQTT_MSG_PUBLISH_TYPE) &&
|
|
|
+ (msgCtx.Message.MessageId == this.MessageId) &&
|
|
|
+ msgCtx.Flow == this.Flow);
|
|
|
+
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /// <summary>
|
|
|
+ /// MQTT protocol version
|
|
|
+ /// </summary>
|
|
|
+ public enum MqttProtocolVersion
|
|
|
+ {
|
|
|
+ Version_3_1 = MqttMsgConnect.PROTOCOL_VERSION_V3_1,
|
|
|
+ Version_3_1_1 = MqttMsgConnect.PROTOCOL_VERSION_V3_1_1
|
|
|
+ }
|
|
|
+}
|
ppatierno
