119 lines
3.7 KiB
C#
119 lines
3.7 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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namespace uPLibrary.Networking.M2Mqtt.Messages
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{
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/// <summary>
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/// Class for PUBREC message from broker to client
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/// </summary>
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public class MqttMsgPubrec : MqttMsgBase
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{
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#region Properties...
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/// <summary>
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/// Message identifier for the acknowledged publish message
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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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// message identifier
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private ushort messageId;
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/// <summary>
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/// Constructor
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/// </summary>
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public MqttMsgPubrec()
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{
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this.type = MQTT_MSG_PUBREC_TYPE;
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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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// message identifier
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varHeaderSize += MESSAGE_ID_SIZE;
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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++] = (MQTT_MSG_PUBREC_TYPE << MSG_TYPE_OFFSET);
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// encode remaining length
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index = this.encodeRemainingLength(remainingLength, buffer, index);
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// get message identifier
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buffer[index++] = (byte)((this.messageId >> 8) & 0x00FF); // MSB
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buffer[index++] = (byte)(this.messageId & 0x00FF); // LSB
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return buffer;
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}
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/// <summary>
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/// Parse bytes for a PUBREC 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>PUBREC message instance</returns>
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public static MqttMsgPubrec 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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MqttMsgPubrec msg = new MqttMsgPubrec();
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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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channel.Receive(buffer);
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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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return msg;
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}
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}
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}
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