240 lines
8.5 KiB
C#
240 lines
8.5 KiB
C#
/*
|
|
Copyright (c) 2013, 2014 Paolo Patierno
|
|
|
|
All rights reserved. This program and the accompanying materials
|
|
are made available under the terms of the Eclipse Public License v1.0
|
|
and Eclipse Distribution License v1.0 which accompany this distribution.
|
|
|
|
The Eclipse Public License is available at
|
|
http://www.eclipse.org/legal/epl-v10.html
|
|
and the Eclipse Distribution License is available at
|
|
http://www.eclipse.org/org/documents/edl-v10.php.
|
|
|
|
Contributors:
|
|
Paolo Patierno - initial API and implementation and/or initial documentation
|
|
*/
|
|
|
|
using System;
|
|
// if NOT .Net Micro Framework
|
|
#if (!MF_FRAMEWORK_VERSION_V4_2 && !MF_FRAMEWORK_VERSION_V4_3)
|
|
using System.Collections.Generic;
|
|
#endif
|
|
using System.Collections;
|
|
using System.Text;
|
|
using uPLibrary.Networking.M2Mqtt.Exceptions;
|
|
|
|
namespace uPLibrary.Networking.M2Mqtt.Messages
|
|
{
|
|
/// <summary>
|
|
/// Class for UNSUBSCRIBE message from client to broker
|
|
/// </summary>
|
|
public class MqttMsgUnsubscribe : MqttMsgBase
|
|
{
|
|
#region Properties...
|
|
|
|
/// <summary>
|
|
/// List of topics to unsubscribe
|
|
/// </summary>
|
|
public string[] Topics
|
|
{
|
|
get { return this.topics; }
|
|
set { this.topics = value; }
|
|
}
|
|
|
|
#endregion
|
|
|
|
// topics to unsubscribe
|
|
string[] topics;
|
|
|
|
/// <summary>
|
|
/// Constructor
|
|
/// </summary>
|
|
public MqttMsgUnsubscribe()
|
|
{
|
|
this.type = MQTT_MSG_UNSUBSCRIBE_TYPE;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Constructor
|
|
/// </summary>
|
|
/// <param name="topics">List of topics to unsubscribe</param>
|
|
public MqttMsgUnsubscribe(string[] topics)
|
|
{
|
|
this.type = MQTT_MSG_UNSUBSCRIBE_TYPE;
|
|
|
|
this.topics = topics;
|
|
|
|
// UNSUBSCRIBE message uses QoS Level 1 (not "officially" in 3.1.1)
|
|
this.qosLevel = QOS_LEVEL_AT_LEAST_ONCE;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Parse bytes for a UNSUBSCRIBE message
|
|
/// </summary>
|
|
/// <param name="fixedHeaderFirstByte">First fixed header byte</param>
|
|
/// <param name="protocolVersion">Protocol Version</param>
|
|
/// <param name="channel">Channel connected to the broker</param>
|
|
/// <returns>UNSUBSCRIBE message instance</returns>
|
|
public static MqttMsgUnsubscribe Parse(byte fixedHeaderFirstByte, byte protocolVersion, IMqttNetworkChannel channel)
|
|
{
|
|
byte[] buffer;
|
|
int index = 0;
|
|
byte[] topicUtf8;
|
|
int topicUtf8Length;
|
|
MqttMsgUnsubscribe msg = new MqttMsgUnsubscribe();
|
|
|
|
if (protocolVersion == MqttMsgConnect.PROTOCOL_VERSION_V3_1_1)
|
|
{
|
|
// [v3.1.1] check flag bits
|
|
if ((fixedHeaderFirstByte & MSG_FLAG_BITS_MASK) != MQTT_MSG_UNSUBSCRIBE_FLAG_BITS)
|
|
throw new MqttClientException(MqttClientErrorCode.InvalidFlagBits);
|
|
}
|
|
|
|
// get remaining length and allocate buffer
|
|
int remainingLength = MqttMsgBase.decodeRemainingLength(channel);
|
|
buffer = new byte[remainingLength];
|
|
|
|
// read bytes from socket...
|
|
int received = channel.Receive(buffer);
|
|
|
|
if (protocolVersion == MqttMsgConnect.PROTOCOL_VERSION_V3_1)
|
|
{
|
|
// only 3.1.0
|
|
|
|
// 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);
|
|
// retain flag not used
|
|
msg.retain = false;
|
|
}
|
|
|
|
// message id
|
|
msg.messageId = (ushort)((buffer[index++] << 8) & 0xFF00);
|
|
msg.messageId |= (buffer[index++]);
|
|
|
|
// payload contains topics
|
|
// NOTE : before, I don't know how many topics will be in the payload (so use List)
|
|
|
|
// if .Net Micro Framework
|
|
#if (MF_FRAMEWORK_VERSION_V4_2 || MF_FRAMEWORK_VERSION_V4_3)
|
|
IList tmpTopics = new ArrayList();
|
|
// else other frameworks (.Net, .Net Compact, Mono, Windows Phone)
|
|
#else
|
|
IList<String> tmpTopics = new List<String>();
|
|
#endif
|
|
do
|
|
{
|
|
// topic name
|
|
topicUtf8Length = ((buffer[index++] << 8) & 0xFF00);
|
|
topicUtf8Length |= buffer[index++];
|
|
topicUtf8 = new byte[topicUtf8Length];
|
|
Array.Copy(buffer, index, topicUtf8, 0, topicUtf8Length);
|
|
index += topicUtf8Length;
|
|
tmpTopics.Add(new String(Encoding.UTF8.GetChars(topicUtf8)));
|
|
} while (index < remainingLength);
|
|
|
|
// copy from list to array
|
|
msg.topics = new string[tmpTopics.Count];
|
|
for (int i = 0; i < tmpTopics.Count; i++)
|
|
{
|
|
msg.topics[i] = (string)tmpTopics[i];
|
|
}
|
|
|
|
return msg;
|
|
}
|
|
|
|
public override byte[] GetBytes(byte protocolVersion)
|
|
{
|
|
int fixedHeaderSize = 0;
|
|
int varHeaderSize = 0;
|
|
int payloadSize = 0;
|
|
int remainingLength = 0;
|
|
byte[] buffer;
|
|
int index = 0;
|
|
|
|
// topics list empty
|
|
if ((this.topics == null) || (this.topics.Length == 0))
|
|
throw new MqttClientException(MqttClientErrorCode.TopicsEmpty);
|
|
|
|
// message identifier
|
|
varHeaderSize += MESSAGE_ID_SIZE;
|
|
|
|
int topicIdx = 0;
|
|
byte[][] topicsUtf8 = new byte[this.topics.Length][];
|
|
|
|
for (topicIdx = 0; topicIdx < this.topics.Length; topicIdx++)
|
|
{
|
|
// check topic length
|
|
if ((this.topics[topicIdx].Length < MIN_TOPIC_LENGTH) || (this.topics[topicIdx].Length > MAX_TOPIC_LENGTH))
|
|
throw new MqttClientException(MqttClientErrorCode.TopicLength);
|
|
|
|
topicsUtf8[topicIdx] = Encoding.UTF8.GetBytes(this.topics[topicIdx]);
|
|
payloadSize += 2; // topic size (MSB, LSB)
|
|
payloadSize += topicsUtf8[topicIdx].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
|
|
if (protocolVersion == MqttMsgConnect.PROTOCOL_VERSION_V3_1_1)
|
|
buffer[index++] = (MQTT_MSG_UNSUBSCRIBE_TYPE << MSG_TYPE_OFFSET) | MQTT_MSG_UNSUBSCRIBE_FLAG_BITS; // [v.3.1.1]
|
|
else
|
|
{
|
|
buffer[index] = (byte)((MQTT_MSG_UNSUBSCRIBE_TYPE << MSG_TYPE_OFFSET) |
|
|
(this.qosLevel << QOS_LEVEL_OFFSET));
|
|
buffer[index] |= this.dupFlag ? (byte)(1 << DUP_FLAG_OFFSET) : (byte)0x00;
|
|
index++;
|
|
}
|
|
|
|
// encode remaining length
|
|
index = this.encodeRemainingLength(remainingLength, buffer, index);
|
|
|
|
// check message identifier assigned
|
|
if (this.messageId == 0)
|
|
throw new MqttClientException(MqttClientErrorCode.WrongMessageId);
|
|
buffer[index++] = (byte)((messageId >> 8) & 0x00FF); // MSB
|
|
buffer[index++] = (byte)(messageId & 0x00FF); // LSB
|
|
|
|
topicIdx = 0;
|
|
for (topicIdx = 0; topicIdx < this.topics.Length; topicIdx++)
|
|
{
|
|
// topic name
|
|
buffer[index++] = (byte)((topicsUtf8[topicIdx].Length >> 8) & 0x00FF); // MSB
|
|
buffer[index++] = (byte)(topicsUtf8[topicIdx].Length & 0x00FF); // LSB
|
|
Array.Copy(topicsUtf8[topicIdx], 0, buffer, index, topicsUtf8[topicIdx].Length);
|
|
index += topicsUtf8[topicIdx].Length;
|
|
}
|
|
|
|
return buffer;
|
|
}
|
|
|
|
public override string ToString()
|
|
{
|
|
#if TRACE
|
|
return this.GetTraceString(
|
|
"UNSUBSCRIBE",
|
|
new object[] { "messageId", "topics" },
|
|
new object[] { this.messageId, this.topics });
|
|
#else
|
|
return base.ToString();
|
|
#endif
|
|
}
|
|
}
|
|
}
|