123 lines
3.7 KiB
C#
123 lines
3.7 KiB
C#
/*
|
|
M2Mqtt - MQTT Client Library for .Net
|
|
Copyright (c) 2014, Paolo Patierno, All rights reserved.
|
|
|
|
This library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 3.0 of the License, or (at your option) any later version.
|
|
|
|
This library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with this library.
|
|
*/
|
|
|
|
using System;
|
|
|
|
namespace uPLibrary.Networking.M2Mqtt.Messages
|
|
{
|
|
/// <summary>
|
|
/// Class for UNSUBACK message from broker to client
|
|
/// </summary>
|
|
public class MqttMsgUnsuback : MqttMsgBase
|
|
{
|
|
#region Properties...
|
|
|
|
/// <summary>
|
|
/// Message identifier for the unsubscribe message
|
|
/// that is acknowledged
|
|
/// </summary>
|
|
public ushort MessageId
|
|
{
|
|
get { return this.messageId; }
|
|
set { this.messageId = value; }
|
|
}
|
|
|
|
#endregion
|
|
|
|
// message identifier
|
|
private ushort messageId;
|
|
|
|
/// <summary>
|
|
/// Constructor
|
|
/// </summary>
|
|
public MqttMsgUnsuback()
|
|
{
|
|
this.type = MQTT_MSG_UNSUBACK_TYPE;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Parse bytes for a UNSUBACK message
|
|
/// </summary>
|
|
/// <param name="fixedHeaderFirstByte">First fixed header byte</param>
|
|
/// <param name="channel">Channel connected to the broker</param>
|
|
/// <returns>UNSUBACK message instance</returns>
|
|
public static MqttMsgUnsuback Parse(byte fixedHeaderFirstByte, IMqttNetworkChannel channel)
|
|
{
|
|
byte[] buffer;
|
|
int index = 0;
|
|
MqttMsgUnsuback msg = new MqttMsgUnsuback();
|
|
|
|
// get remaining length and allocate buffer
|
|
int remainingLength = MqttMsgBase.decodeRemainingLength(channel);
|
|
buffer = new byte[remainingLength];
|
|
|
|
// read bytes from socket...
|
|
channel.Receive(buffer);
|
|
|
|
// message id
|
|
msg.messageId = (ushort)((buffer[index++] << 8) & 0xFF00);
|
|
msg.messageId |= (buffer[index++]);
|
|
|
|
return msg;
|
|
}
|
|
|
|
public override byte[] GetBytes()
|
|
{
|
|
int fixedHeaderSize = 0;
|
|
int varHeaderSize = 0;
|
|
int payloadSize = 0;
|
|
int remainingLength = 0;
|
|
byte[] buffer;
|
|
int index = 0;
|
|
|
|
// message identifier
|
|
varHeaderSize += MESSAGE_ID_SIZE;
|
|
|
|
remainingLength += (varHeaderSize + payloadSize);
|
|
|
|
// first byte of fixed header
|
|
fixedHeaderSize = 1;
|
|
|
|
int temp = remainingLength;
|
|
// increase fixed header size based on remaining length
|
|
// (each remaining length byte can encode until 128)
|
|
do
|
|
{
|
|
fixedHeaderSize++;
|
|
temp = temp / 128;
|
|
} while (temp > 0);
|
|
|
|
// allocate buffer for message
|
|
buffer = new byte[fixedHeaderSize + varHeaderSize + payloadSize];
|
|
|
|
// first fixed header byte
|
|
buffer[index] = (byte)(MQTT_MSG_UNSUBACK_TYPE << MSG_TYPE_OFFSET);
|
|
index++;
|
|
|
|
// encode remaining length
|
|
index = this.encodeRemainingLength(remainingLength, buffer, index);
|
|
|
|
// message id
|
|
buffer[index++] = (byte)((this.messageId >> 8) & 0x00FF); // MSB
|
|
buffer[index++] = (byte)(this.messageId & 0x00FF); // LSB
|
|
|
|
return buffer;
|
|
}
|
|
}
|
|
}
|