138 lines
4.4 KiB
C#
138 lines
4.4 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 CONNACK message from broker to client
|
|
/// </summary>
|
|
public class MqttMsgConnack : MqttMsgBase
|
|
{
|
|
#region Constants...
|
|
|
|
// return codes for CONNACK message
|
|
public const byte CONN_ACCEPTED = 0x00;
|
|
public const byte CONN_REFUSED_PROT_VERS = 0x01;
|
|
public const byte CONN_REFUSED_IDENT_REJECTED = 0x02;
|
|
public const byte CONN_REFUSED_SERVER_UNAVAILABLE = 0x03;
|
|
public const byte CONN_REFUSED_USERNAME_PASSWORD = 0x04;
|
|
public const byte CONN_REFUSED_NOT_AUTHORIZED = 0x05;
|
|
|
|
private const byte TOPIC_NAME_COMP_RESP_BYTE_OFFSET = 0;
|
|
private const byte TOPIC_NAME_COMP_RESP_BYTE_SIZE = 1;
|
|
private const byte CONN_RETURN_CODE_BYTE_OFFSET = 1;
|
|
private const byte CONN_RETURN_CODE_BYTE_SIZE = 1;
|
|
|
|
#endregion
|
|
|
|
#region Properties...
|
|
|
|
/// <summary>
|
|
/// Return Code
|
|
/// </summary>
|
|
public byte ReturnCode
|
|
{
|
|
get { return this.returnCode; }
|
|
set { this.returnCode = value; }
|
|
}
|
|
|
|
#endregion
|
|
|
|
// return code for CONNACK message
|
|
private byte returnCode;
|
|
|
|
/// <summary>
|
|
/// Constructor
|
|
/// </summary>
|
|
public MqttMsgConnack()
|
|
{
|
|
this.type = MQTT_MSG_CONNACK_TYPE;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Parse bytes for a CONNACK message
|
|
/// </summary>
|
|
/// <param name="fixedHeaderFirstByte">First fixed header byte</param>
|
|
/// <param name="channel">Channel connected to the broker</param>
|
|
/// <returns>CONNACK message instance</returns>
|
|
public static MqttMsgConnack Parse(byte fixedHeaderFirstByte, IMqttNetworkChannel channel)
|
|
{
|
|
byte[] buffer;
|
|
MqttMsgConnack msg = new MqttMsgConnack();
|
|
|
|
// get remaining length and allocate buffer
|
|
int remainingLength = MqttMsgBase.decodeRemainingLength(channel);
|
|
buffer = new byte[remainingLength];
|
|
|
|
// read bytes from socket...
|
|
channel.Receive(buffer);
|
|
// ...and set return code from broker
|
|
msg.returnCode = buffer[CONN_RETURN_CODE_BYTE_OFFSET];
|
|
|
|
return msg;
|
|
}
|
|
|
|
public override byte[] GetBytes()
|
|
{
|
|
int fixedHeaderSize = 0;
|
|
int varHeaderSize = 0;
|
|
int payloadSize = 0;
|
|
int remainingLength = 0;
|
|
byte[] buffer;
|
|
int index = 0;
|
|
|
|
// topic name compression response and connect return code
|
|
varHeaderSize += (TOPIC_NAME_COMP_RESP_BYTE_SIZE + CONN_RETURN_CODE_BYTE_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_CONNACK_TYPE << MSG_TYPE_OFFSET);
|
|
index++;
|
|
|
|
// encode remaining length
|
|
index = this.encodeRemainingLength(remainingLength, buffer, index);
|
|
|
|
// topic name compression response (reserved values. not used);
|
|
buffer[index++] = 0x00;
|
|
|
|
// connect return code
|
|
buffer[index++] = this.returnCode;
|
|
|
|
return buffer;
|
|
}
|
|
}
|
|
}
|