271 lines
9.4 KiB
C#
271 lines
9.4 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;
|
|
using System.Text;
|
|
using uPLibrary.Networking.M2Mqtt.Exceptions;
|
|
|
|
namespace uPLibrary.Networking.M2Mqtt.Messages
|
|
{
|
|
/// <summary>
|
|
/// Class for PUBLISH message from client to broker
|
|
/// </summary>
|
|
public class MqttMsgPublish : MqttMsgBase
|
|
{
|
|
#region Properties...
|
|
|
|
/// <summary>
|
|
/// Message topic
|
|
/// </summary>
|
|
public string Topic
|
|
{
|
|
get { return this.topic; }
|
|
set { this.topic = value; }
|
|
}
|
|
|
|
/// <summary>
|
|
/// Message data
|
|
/// </summary>
|
|
public byte[] Message
|
|
{
|
|
get { return this.message; }
|
|
set { this.message = value; }
|
|
}
|
|
|
|
/// <summary>
|
|
/// Message identifier
|
|
/// </summary>
|
|
public ushort MessageId
|
|
{
|
|
get { return this.messageId; }
|
|
set { this.messageId = value; }
|
|
}
|
|
|
|
#endregion
|
|
|
|
// message topic
|
|
private string topic;
|
|
// message data
|
|
private byte[] message;
|
|
// message identifier
|
|
ushort messageId;
|
|
|
|
/// <summary>
|
|
/// Constructor
|
|
/// </summary>
|
|
public MqttMsgPublish()
|
|
{
|
|
this.type = MQTT_MSG_PUBLISH_TYPE;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Constructor
|
|
/// </summary>
|
|
/// <param name="topic">Message topic</param>
|
|
/// <param name="message">Message data</param>
|
|
public MqttMsgPublish(string topic, byte[] message) :
|
|
this(topic, message, false, QOS_LEVEL_AT_MOST_ONCE, false)
|
|
{
|
|
}
|
|
|
|
/// <summary>
|
|
/// Constructor
|
|
/// </summary>
|
|
/// <param name="topic">Message topic</param>
|
|
/// <param name="message">Message data</param>
|
|
/// <param name="dupFlag">Duplicate flag</param>
|
|
/// <param name="qosLevel">Quality of Service level</param>
|
|
/// <param name="retain">Retain flag</param>
|
|
public MqttMsgPublish(string topic,
|
|
byte[] message,
|
|
bool dupFlag,
|
|
byte qosLevel,
|
|
bool retain) : base()
|
|
{
|
|
this.type = MQTT_MSG_PUBLISH_TYPE;
|
|
|
|
this.topic = topic;
|
|
this.message = message;
|
|
this.dupFlag = dupFlag;
|
|
this.qosLevel = qosLevel;
|
|
this.retain = retain;
|
|
this.messageId = 0;
|
|
}
|
|
|
|
public override byte[] GetBytes()
|
|
{
|
|
int fixedHeaderSize = 0;
|
|
int varHeaderSize = 0;
|
|
int payloadSize = 0;
|
|
int remainingLength = 0;
|
|
byte[] buffer;
|
|
int index = 0;
|
|
|
|
// topic can't contain wildcards
|
|
if ((this.topic.IndexOf('#') != -1) || (this.topic.IndexOf('+') != -1))
|
|
throw new MqttClientException(MqttClientErrorCode.TopicWildcard);
|
|
|
|
// check topic length
|
|
if ((this.topic.Length < MIN_TOPIC_LENGTH) || (this.topic.Length > MAX_TOPIC_LENGTH))
|
|
throw new MqttClientException(MqttClientErrorCode.TopicLength);
|
|
|
|
byte[] topicUtf8 = Encoding.UTF8.GetBytes(this.topic);
|
|
|
|
// topic name
|
|
varHeaderSize += topicUtf8.Length + 2;
|
|
|
|
// message id is valid only with QOS level 1 or QOS level 2
|
|
if ((this.qosLevel == QOS_LEVEL_AT_LEAST_ONCE) ||
|
|
(this.qosLevel == QOS_LEVEL_EXACTLY_ONCE))
|
|
{
|
|
varHeaderSize += MESSAGE_ID_SIZE;
|
|
}
|
|
|
|
// check on message with zero length
|
|
if (this.message != null)
|
|
// message data
|
|
payloadSize += this.message.Length;
|
|
|
|
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_PUBLISH_TYPE << MSG_TYPE_OFFSET) |
|
|
(this.qosLevel << QOS_LEVEL_OFFSET));
|
|
buffer[index] |= this.dupFlag ? (byte)(1 << DUP_FLAG_OFFSET) : (byte)0x00;
|
|
buffer[index] |= this.retain ? (byte)(1 << RETAIN_FLAG_OFFSET) : (byte)0x00;
|
|
index++;
|
|
|
|
// encode remaining length
|
|
index = this.encodeRemainingLength(remainingLength, buffer, index);
|
|
|
|
// topic name
|
|
buffer[index++] = (byte)((topicUtf8.Length >> 8) & 0x00FF); // MSB
|
|
buffer[index++] = (byte)(topicUtf8.Length & 0x00FF); // LSB
|
|
Array.Copy(topicUtf8, 0, buffer, index, topicUtf8.Length);
|
|
index += topicUtf8.Length;
|
|
|
|
// message id is valid only with QOS level 1 or QOS level 2
|
|
if ((this.qosLevel == QOS_LEVEL_AT_LEAST_ONCE) ||
|
|
(this.qosLevel == QOS_LEVEL_EXACTLY_ONCE))
|
|
{
|
|
// check message identifier assigned
|
|
if (this.messageId == 0)
|
|
throw new MqttClientException(MqttClientErrorCode.WrongMessageId);
|
|
buffer[index++] = (byte)((this.messageId >> 8) & 0x00FF); // MSB
|
|
buffer[index++] = (byte)(this.messageId & 0x00FF); // LSB
|
|
}
|
|
|
|
// check on message with zero length
|
|
if (this.message != null)
|
|
{
|
|
// message data
|
|
Array.Copy(this.message, 0, buffer, index, this.message.Length);
|
|
index += this.message.Length;
|
|
}
|
|
|
|
return buffer;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Parse bytes for a PUBLISH message
|
|
/// </summary>
|
|
/// <param name="fixedHeaderFirstByte">First fixed header byte</param>
|
|
/// <param name="channel">Channel connected to the broker</param>
|
|
/// <returns>PUBLISH message instance</returns>
|
|
public static MqttMsgPublish Parse(byte fixedHeaderFirstByte, IMqttNetworkChannel channel)
|
|
{
|
|
byte[] buffer;
|
|
int index = 0;
|
|
byte[] topicUtf8;
|
|
int topicUtf8Length;
|
|
MqttMsgPublish msg = new MqttMsgPublish();
|
|
|
|
// get remaining length and allocate buffer
|
|
int remainingLength = MqttMsgBase.decodeRemainingLength(channel);
|
|
buffer = new byte[remainingLength];
|
|
|
|
// read bytes from socket...
|
|
int received = channel.Receive(buffer);
|
|
|
|
// topic name
|
|
topicUtf8Length = ((buffer[index++] << 8) & 0xFF00);
|
|
topicUtf8Length |= buffer[index++];
|
|
topicUtf8 = new byte[topicUtf8Length];
|
|
Array.Copy(buffer, index, topicUtf8, 0, topicUtf8Length);
|
|
index += topicUtf8Length;
|
|
msg.topic = new String(Encoding.UTF8.GetChars(topicUtf8));
|
|
|
|
// read QoS level from fixed header
|
|
msg.qosLevel = (byte)((fixedHeaderFirstByte & QOS_LEVEL_MASK) >> QOS_LEVEL_OFFSET);
|
|
// read DUP flag from fixed header
|
|
msg.dupFlag = (((fixedHeaderFirstByte & DUP_FLAG_MASK) >> DUP_FLAG_OFFSET) == 0x01);
|
|
// read retain flag from fixed header
|
|
msg.retain = (((fixedHeaderFirstByte & RETAIN_FLAG_MASK) >> RETAIN_FLAG_OFFSET) == 0x01);
|
|
|
|
// message id is valid only with QOS level 1 or QOS level 2
|
|
if ((msg.qosLevel == QOS_LEVEL_AT_LEAST_ONCE) ||
|
|
(msg.qosLevel == QOS_LEVEL_EXACTLY_ONCE))
|
|
{
|
|
// message id
|
|
msg.messageId = (ushort)((buffer[index++] << 8) & 0xFF00);
|
|
msg.messageId |= (buffer[index++]);
|
|
}
|
|
|
|
// get payload with message data
|
|
int messageSize = remainingLength - index;
|
|
int remaining = messageSize;
|
|
int messageOffset = 0;
|
|
msg.message = new byte[messageSize];
|
|
|
|
// BUG FIX 26/07/2013 : receiving large payload
|
|
|
|
// copy first part of payload data received
|
|
Array.Copy(buffer, index, msg.message, messageOffset, received - index);
|
|
remaining -= (received - index);
|
|
messageOffset += (received - index);
|
|
|
|
// if payload isn't finished
|
|
while (remaining > 0)
|
|
{
|
|
// receive other payload data
|
|
received = channel.Receive(buffer);
|
|
Array.Copy(buffer, 0, msg.message, messageOffset, received);
|
|
remaining -= received;
|
|
messageOffset += received;
|
|
}
|
|
|
|
return msg;
|
|
}
|
|
}
|
|
}
|