/// <summary>
/// Parse bytes for a UNSUBSCRIBE message
/// </summary>
/// <param name="fixedHeaderFirstByte">First fixed header byte</param>
/// <param name="channel">Channel connected to the broker</param>
/// <returns>UNSUBSCRIBE message instance</returns>
public static MqttMsgUnsubscribe Parse(byte fixedHeaderFirstByte, IMqttNetworkChannel channel)
{
byte[] buffer;
int index = 0;
byte[] topicUtf8;
int topicUtf8Length;
MqttMsgUnsubscribe msg = new MqttMsgUnsubscribe();
// get remaining length and allocate buffer
int remainingLength = MqttMsgBase.decodeRemainingLength(channel);
buffer = new byte[remainingLength];
// read bytes from socket...
//int received = channel.Receive(buffer);
channel.Receive(buffer);
// 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);
}
/// <summary>
/// Unsubscribe for message topics
/// </summary>
/// <param name="topics">List of topics to unsubscribe</param>
/// <returns>Message Id in UNSUBACK message from broker</returns>
public ushort Unsubscribe(string[] topics)
{
int attempts = 0;
bool acknowledged = false;
MqttMsgUnsubscribe unsubscribe =
new MqttMsgUnsubscribe(topics);
MqttMsgUnsuback unsuback = null;
do
{
try
{
// try unsubscribe
unsuback = (MqttMsgUnsuback)this.SendReceive(unsubscribe.GetBytes());
acknowledged = true;
}
catch (MqttTimeoutException)
{
// no UNSUBACK message received in time, retry with duplicate flag
attempts++;
unsubscribe.DupFlag = true;
// delay before retry
if (attempts < MQTT_ATTEMPTS_RETRY)
Thread.Sleep(MQTT_DELAY_RETRY);
}
} while ((attempts < MQTT_ATTEMPTS_RETRY) && !acknowledged);
// return message id from SUBACK or zero (no message id)
return acknowledged ? unsuback.MessageId : (ushort)0;
}
/// <summary>
/// Unsubscribe for message topics
/// </summary>
/// <param name="topics">List of topics to unsubscribe</param>
/// <returns>Message Id in UNSUBACK message from broker</returns>
public ushort Unsubscribe(string[] topics)
{
MqttMsgUnsubscribe unsubscribe =
new MqttMsgUnsubscribe(topics);
unsubscribe.MessageId = this.GetMessageId();
// enqueue unsubscribe request into the inflight queue
this.EnqueueInflight(unsubscribe, MqttMsgFlow.ToPublish);
return unsubscribe.MessageId;
}
/// <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 static MqttMsgUnsubscribe Parse(byte fixedHeaderFirstByte, byte protocolVersion, IMqttNetworkChannel channel)
{
int num1 = 0;
MqttMsgUnsubscribe mqttMsgUnsubscribe1 = new MqttMsgUnsubscribe();
if (protocolVersion == (byte)4 && ((int)fixedHeaderFirstByte & 15) != 2)
{
throw new MqttClientException(MqttClientErrorCode.InvalidFlagBits);
}
int length1 = MqttMsgBase.decodeRemainingLength(channel);
byte[] buffer = new byte[length1];
channel.Receive(buffer);
if (protocolVersion == (byte)3)
{
mqttMsgUnsubscribe1.qosLevel = checked ((byte)(((int)fixedHeaderFirstByte & 6) >> 1));
mqttMsgUnsubscribe1.dupFlag = ((int)fixedHeaderFirstByte & 8) >> 3 == 1;
mqttMsgUnsubscribe1.retain = false;
}
MqttMsgUnsubscribe mqttMsgUnsubscribe2 = mqttMsgUnsubscribe1;
byte[] numArray1 = buffer;
int index1 = num1;
int num2 = checked (index1 + 1);
int num3 = (int)checked ((ushort)((int)numArray1[index1] << 8 & 65280));
mqttMsgUnsubscribe2.messageId = (ushort)num3;
MqttMsgUnsubscribe mqttMsgUnsubscribe3 = mqttMsgUnsubscribe1;
int messageId = (int)mqttMsgUnsubscribe3.messageId;
byte[] numArray2 = buffer;
int index2 = num2;
int num4 = checked (index2 + 1);
int num5 = (int)numArray2[index2];
mqttMsgUnsubscribe3.messageId = (ushort)(messageId | num5);
IList <string> stringList = (IList <string>) new List <string>();
do
{
byte[] numArray3 = buffer;
int index3 = num4;
int num6 = checked (index3 + 1);
int num7 = (int)numArray3[index3] << 8 & 65280;
byte[] numArray4 = buffer;
int index4 = num6;
int sourceIndex = checked (index4 + 1);
int num8 = (int)numArray4[index4];
int length2 = num7 | num8;
byte[] bytes = new byte[length2];
Array.Copy((Array)buffer, sourceIndex, (Array)bytes, 0, length2);
num4 = checked (sourceIndex + length2);
stringList.Add(new string(Encoding.UTF8.GetChars(bytes)));
}while (num4 < length1);
mqttMsgUnsubscribe1.topics = new string[stringList.Count];
int index5 = 0;
while (index5 < stringList.Count)
{
mqttMsgUnsubscribe1.topics[index5] = stringList[index5];
checked { ++index5; }
}
return(mqttMsgUnsubscribe1);
}
