public Command Unmarshal(BinaryReader dis)
{
byte fixedHeader = dis.ReadByte();
Command cmd = MQTTCommandFactory.CreateCommand(fixedHeader);
// Variable length header gives us total Message length to buffer.
int length = ReadLength(dis);
if (length != 0)
{
byte[] buffer = dis.ReadBytes(length);
if (buffer.Length != length)
{
throw new IOException("Invalid stream read occurred.");
}
MemoryStream ms = new MemoryStream(buffer);
EndianBinaryReader reader = new EndianBinaryReader(ms);
cmd.Decode(reader);
}
// A CONNACK is a response and it's correlationId is always 1, but if it has an
// error code, then we create a suitable ErrorResponse here with the correct
// NMSException in its payload.
if (cmd.IsCONNACK)
{
CONNACK connAck = cmd as CONNACK;
connAck.CorrelationId = 1;
if (cmd.IsErrorResponse)
{
ErrorResponse error = new ErrorResponse();
error.Error = MQTTExceptionFactory.CreateConnectionException(connAck.ReturnCode);
cmd = error;
}
}
Tracer.DebugFormat("MQTT Command received: {0}", cmd);
Console.WriteLine("MQTT Command recieved: {0}", cmd);
return(cmd);
}
public static Command CreateCommand(byte fixedHeader)
{
Header header = new Header(fixedHeader);
Command result = null;
switch (header.Type)
{
case 1:
result = new CONNECT(header);
break;
case 2:
result = new CONNACK(header);
break;
case 3:
result = new PUBLISH(header);
break;
case 4:
result = new PUBACK(header);
break;
case 5:
result = new PUBREC(header);
break;
case 6:
result = new PUBREL(header);
break;
case 7:
result = new PUBCOMP(header);
break;
case 8:
result = new SUBSCRIBE(header);
break;
case 9:
result = new SUBACK(header);
break;
case 10:
result = new UNSUBSCRIBE(header);
break;
case 11:
result = new UNSUBACK(header);
break;
case 12:
result = new PINGREQ(header);
break;
case 13:
result = new PINGRESP(header);
break;
case 14:
result = new DISCONNECT(header);
break;
default:
throw new NMSException("Unknown Command received");
}
return(result);
}
