256 lines
9.0 KiB
C#
256 lines
9.0 KiB
C#
/*
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M2Mqtt - MQTT Client Library for .Net
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Copyright (c) 2014, Paolo Patierno, All rights reserved.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 3.0 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library.
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*/
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using System;
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// if NOT .Net Micro Framework
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#if (!MF_FRAMEWORK_VERSION_V4_2 && !MF_FRAMEWORK_VERSION_V4_3)
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using System.Collections.Generic;
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#endif
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using System.Collections;
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using System.Text;
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using uPLibrary.Networking.M2Mqtt.Exceptions;
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namespace uPLibrary.Networking.M2Mqtt.Messages
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{
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/// <summary>
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/// Class for SUBSCRIBE message from client to broker
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/// </summary>
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public class MqttMsgSubscribe : MqttMsgBase
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{
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#region Properties...
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/// <summary>
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/// List of topics to subscribe
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/// </summary>
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public string[] Topics
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{
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get { return this.topics; }
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set { this.topics = value; }
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}
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/// <summary>
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/// List of QOS Levels related to topics
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/// </summary>
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public byte[] QoSLevels
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{
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get { return this.qosLevels; }
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set { this.qosLevels = value; }
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}
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/// <summary>
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/// Message identifier
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/// </summary>
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public ushort MessageId
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{
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get { return this.messageId; }
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set { this.messageId = value; }
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}
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#endregion
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// topics to subscribe
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string[] topics;
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// QOS levels related to topics
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byte[] qosLevels;
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// message identifier
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ushort messageId;
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/// <summary>
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/// Constructor
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/// </summary>
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public MqttMsgSubscribe()
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{
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this.type = MQTT_MSG_SUBSCRIBE_TYPE;
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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="topics">List of topics to subscribe</param>
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/// <param name="qosLevels">List of QOS Levels related to topics</param>
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public MqttMsgSubscribe(string[] topics, byte[] qosLevels)
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{
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this.type = MQTT_MSG_SUBSCRIBE_TYPE;
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this.topics = topics;
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this.qosLevels = qosLevels;
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// SUBSCRIBE message uses QoS Level 1
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this.qosLevel = QOS_LEVEL_AT_LEAST_ONCE;
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}
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/// <summary>
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/// Parse bytes for a SUBSCRIBE message
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/// </summary>
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/// <param name="fixedHeaderFirstByte">First fixed header byte</param>
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/// <param name="channel">Channel connected to the broker</param>
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/// <returns>SUBSCRIBE message instance</returns>
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public static MqttMsgSubscribe Parse(byte fixedHeaderFirstByte, IMqttNetworkChannel channel)
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{
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byte[] buffer;
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int index = 0;
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byte[] topicUtf8;
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int topicUtf8Length;
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MqttMsgSubscribe msg = new MqttMsgSubscribe();
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// get remaining length and allocate buffer
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int remainingLength = MqttMsgBase.decodeRemainingLength(channel);
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buffer = new byte[remainingLength];
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// read bytes from socket...
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int received = channel.Receive(buffer);
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// read QoS level from fixed header
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msg.qosLevel = (byte)((fixedHeaderFirstByte & QOS_LEVEL_MASK) >> QOS_LEVEL_OFFSET);
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// read DUP flag from fixed header
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msg.dupFlag = (((fixedHeaderFirstByte & DUP_FLAG_MASK) >> DUP_FLAG_OFFSET) == 0x01);
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// retain flag not used
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msg.retain = false;
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// message id
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msg.messageId = (ushort)((buffer[index++] << 8) & 0xFF00);
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msg.messageId |= (buffer[index++]);
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// payload contains topics and QoS levels
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// NOTE : before, I don't know how many topics will be in the payload (so use List)
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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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IList tmpTopics = new ArrayList();
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IList tmpQosLevels = new ArrayList();
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// else other frameworks (.Net, .Net Compact, Mono, Windows Phone)
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#else
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IList<String> tmpTopics = new List<String>();
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IList<byte> tmpQosLevels = new List<byte>();
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#endif
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do
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{
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// topic name
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topicUtf8Length = ((buffer[index++] << 8) & 0xFF00);
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topicUtf8Length |= buffer[index++];
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topicUtf8 = new byte[topicUtf8Length];
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Array.Copy(buffer, index, topicUtf8, 0, topicUtf8Length);
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index += topicUtf8Length;
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tmpTopics.Add(new String(Encoding.UTF8.GetChars(topicUtf8)));
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// QoS level
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tmpQosLevels.Add(buffer[index++]);
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} while (index < remainingLength);
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// copy from list to array
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msg.topics = new string[tmpTopics.Count];
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msg.qosLevels = new byte[tmpQosLevels.Count];
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for (int i = 0; i < tmpTopics.Count; i++)
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{
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msg.topics[i] = (string)tmpTopics[i];
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msg.qosLevels[i] = (byte)tmpQosLevels[i];
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}
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return msg;
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}
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public override byte[] GetBytes()
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{
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int fixedHeaderSize = 0;
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int varHeaderSize = 0;
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int payloadSize = 0;
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int remainingLength = 0;
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byte[] buffer;
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int index = 0;
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// topics list empty
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if ((this.topics == null) || (this.topics.Length == 0))
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throw new MqttClientException(MqttClientErrorCode.TopicsEmpty);
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// qos levels list empty
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if ((this.qosLevels == null) || (this.qosLevels.Length == 0))
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throw new MqttClientException(MqttClientErrorCode.QosLevelsEmpty);
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// topics and qos levels lists length don't match
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if (this.topics.Length != this.qosLevels.Length)
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throw new MqttClientException(MqttClientErrorCode.TopicsQosLevelsNotMatch);
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// message identifier
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varHeaderSize += MESSAGE_ID_SIZE;
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int topicIdx = 0;
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byte[][] topicsUtf8 = new byte[this.topics.Length][];
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for (topicIdx = 0; topicIdx < this.topics.Length; topicIdx++)
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{
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// check topic length
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if ((this.topics[topicIdx].Length < MIN_TOPIC_LENGTH) || (this.topics[topicIdx].Length > MAX_TOPIC_LENGTH))
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throw new MqttClientException(MqttClientErrorCode.TopicLength);
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topicsUtf8[topicIdx] = Encoding.UTF8.GetBytes(this.topics[topicIdx]);
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payloadSize += 2; // topic size (MSB, LSB)
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payloadSize += topicsUtf8[topicIdx].Length;
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payloadSize++; // byte for QoS
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}
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remainingLength += (varHeaderSize + payloadSize);
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// first byte of fixed header
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fixedHeaderSize = 1;
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int temp = remainingLength;
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// increase fixed header size based on remaining length
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// (each remaining length byte can encode until 128)
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do
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{
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fixedHeaderSize++;
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temp = temp / 128;
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} while (temp > 0);
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// allocate buffer for message
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buffer = new byte[fixedHeaderSize + varHeaderSize + payloadSize];
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// first fixed header byte
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buffer[index] = (byte)((MQTT_MSG_SUBSCRIBE_TYPE << MSG_TYPE_OFFSET) |
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(this.qosLevel << QOS_LEVEL_OFFSET));
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buffer[index] |= this.dupFlag ? (byte)(1 << DUP_FLAG_OFFSET) : (byte)0x00;
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index++;
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// encode remaining length
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index = this.encodeRemainingLength(remainingLength, buffer, index);
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// check message identifier assigned (SUBSCRIBE uses QoS Level 1, so message id is mandatory)
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if (this.messageId == 0)
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throw new MqttClientException(MqttClientErrorCode.WrongMessageId);
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buffer[index++] = (byte)((messageId >> 8) & 0x00FF); // MSB
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buffer[index++] = (byte)(messageId & 0x00FF); // LSB
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topicIdx = 0;
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for (topicIdx = 0; topicIdx < this.topics.Length; topicIdx++)
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{
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// topic name
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buffer[index++] = (byte)((topicsUtf8[topicIdx].Length >> 8) & 0x00FF); // MSB
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buffer[index++] = (byte)(topicsUtf8[topicIdx].Length & 0x00FF); // LSB
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Array.Copy(topicsUtf8[topicIdx], 0, buffer, index, topicsUtf8[topicIdx].Length);
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index += topicsUtf8[topicIdx].Length;
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// requested QoS
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buffer[index++] = this.qosLevels[topicIdx];
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}
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return buffer;
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}
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}
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}
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