public static FixedHeader Deserialize(byte[] data)
{
Validate
.Begin()
.IsNotNull(data)
.IsGreaterThanOrEqualTo(data.Length, 2)
.Check();
var header = new FixedHeader();
// ---- message type ----
header.MessageType = (MessageType)(data[0] >> 4);
// ---- duplicate ----
header.DuplicateDelivery = (data[0] & DuplicateDeliveryBit) == DuplicateDeliveryBit;
// ---- qos ----
var qos = (QoS)((data[0] >> 1) & 3);
header.QoS = qos;
// ---- retain ----
header.Retain = (data[0] & RetainBit) == RetainBit;
// ---- remaining length ----
header.RemainingLength = DecodeRemainingLength(data, 1);
return(header);
}
internal Publish(FixedHeader header, byte[] payload)
: base(header)
{
var payloadLength = payload.Length;
m_header = new VariableHeader <PublishHeaderData>();
VariableHeader = m_header;
// get topic length
var topicLength = System.Net.IPAddress.NetworkToHostOrder(BitConverter.ToInt16(payload, 0));
payloadLength -= 2;
// get topic name
m_header.HeaderData.TopicName = Encoding.UTF8.GetString(payload, 2, topicLength);
payloadLength -= topicLength;
if (header.QoS > 0)
{
// pull message ID
m_header.HeaderData.MessageID = (ushort)System.Net.IPAddress.NetworkToHostOrder(BitConverter.ToInt16(payload, payload.Length - payloadLength));
payloadLength -= 2;
}
m_data = new byte[payloadLength];
Buffer.BlockCopy(payload, payload.Length - payloadLength, m_data, 0, m_data.Length);
}
public byte[] Serialize()
{
var data = new List <byte>();
var payload = this.Payload;
var length = payload == null ? 0 : payload.Length;
byte[] variableHeader = null;
if (VariableHeader != null)
{
variableHeader = VariableHeader.Serialize();
length += variableHeader.Length;
}
FixedHeader.RemainingLength = length;
data.AddRange(FixedHeader.Serialize());
if (variableHeader != null)
{
data.AddRange(variableHeader);
}
if (payload != null)
{
data.AddRange(payload);
}
return(data.ToArray());
}
internal PingResponse(FixedHeader header, byte[] payload)
: base(header.MessageType)
{
// NOTE: PingResponse has no variable header and no payload
VariableHeader = null;
}
public Message(MessageType type, QoS qos, bool retain, bool duplicateDelivery)
{
FixedHeader = new FixedHeader();
FixedHeader.MessageType = type;
FixedHeader.QoS = qos;
FixedHeader.Retain = retain;
FixedHeader.DuplicateDelivery = duplicateDelivery;
}
internal Message(FixedHeader header)
{
Validate
.Begin()
.IsNotNull(header)
.Check();
FixedHeader = header;
}
internal ConnectAck(FixedHeader header, byte[] payload)
: base(header)
{
m_payload = payload;
}
private Message DeserializeAndDispatchMessage(byte[] headerdata, byte[] payload)
{
try
{
var header = FixedHeader.Deserialize(headerdata);
TracingDebug("Received: " + header.MessageType.ToString());
switch (header.MessageType)
{
case MessageType.ConnectAck:
var connect = new ConnectAck(header, payload);
IsConnected = true;
autoResetConnEvent.Set();
return(connect);
case MessageType.PingResponse:
return(new PingResponse(header, payload));
case MessageType.SubscribeAck:
break;
case MessageType.UnsubscribeAck:
break;
case MessageType.Publish:
var pub = new Publish(header, payload);
var handler = MessageReceived;
TracingDebug("Topic=" + pub.Topic);
if (handler != null)
{
//handler(pub.Topic, pub.QoS, pub.Payload);
handler(pub.Topic, pub.Payload);
}
if (header.QoS == QoS.AcknowledgeDelivery)
{
var ackMsg = new PublishAck();
var m_header = new VariableHeader <MessageIDHeaderData>();
m_header.HeaderData.MessageID = (ushort)(pub.m_header.HeaderData.MessageID);
ackMsg.VariableHeader = m_header;
//ackMsg.MessageIdentifier = pubMsg.MessageIdentifier;
Send(ackMsg);
TracingDebug("Send PublishAck: MessageID=" + m_header.HeaderData.MessageID);
}
break;
case MessageType.PublishAck:
// TODO: handle this
break;
case MessageType.Connect:
// server connecting to us
throw new NotSupportedException();
default:
throw new NotSupportedException();
}
return(null);
}
catch (Exception e)
{
TracingDebug("DeserializeAndDispatchMessage:" + e.Message);
return(null);
}
}
private void RxThreadProc()
{
try
{
if (IsConnected)
{
#if !WindowsCE
m_stream.ReadTimeout = DefaultTimeout;
#endif
}
}
catch (ObjectDisposedException)
{
IsConnected = false;
}
// start a ping timer on a period less than the above timeout (else we'll timeout and exit)
m_pingTimer = new Timer(PingTimerProc, null, PingPeriod, PingPeriod);
List <byte> header = new List <byte>(4);
byte[] buffer = null;
while ((ConnectionState == ConnectionState.Connecting) || (ConnectionState == ConnectionState.Connected))
{
header.Clear();
// the first byte gives us the type
try
{
var byte0 = m_stream.ReadByte();
if (byte0 == -1)
{
Thread.Sleep(500);
continue;
}
var messageType = (MessageType)(byte0 >> 4);
header.Add((byte)byte0);
byte lengthByte;
// now pull the "remaining length"
do
{
lengthByte = (byte)m_stream.ReadByte();
header.Add(lengthByte);
} while ((lengthByte & 0x80) != 0);
var length = FixedHeader.DecodeRemainingLength(header, 1);
buffer = null;
int read = 0;
if (length > 0)
{
// and pull the payload
buffer = new byte[length];
do
{
read += m_stream.Read(buffer, read, length - read);
} while (read < length);
}
// deserialize and dispatch
var response = DeserializeAndDispatchMessage(header.ToArray(), buffer);
}
catch (Exception ex)
{
// happens during hang up, maybe on error
// needs testing
TracingDebug("!!! Exception in MQTTBroker.RxProc\r\n" + ex.Message);
//if (Debugger.IsAttached) Debugger.Break();
IsConnected = false;
}
}
m_pingTimer.Dispose();
}
public Message(MessageType type)
{
FixedHeader = new FixedHeader();
FixedHeader.MessageType = type;
}