//#pragma warning restore
/// <summary>
/// Parses a header.
/// </summary>
/// <param name="Input">Binary input.</param>
/// <returns>Header.</returns>
public static MqttHeader Parse(BinaryInput Input)
{
MqttHeader Result = new MqttHeader();
// Fixed part:
byte b = Input.ReadByte();
Result.ControlPacketType = (MqttControlPacketType)(b >> 4);
Result.Retain = (b & 1) != 0;
Result.QualityOfService = (MqttQualityOfService)((b >> 1) & 3);
Result.Duplicate = (b & 8) != 0;
b = Input.ReadByte();
int Offset = 0;
Result.RemainingLength = b & 127;
while ((b & 128) != 0)
{
b = Input.ReadByte();
Offset += 7;
Result.RemainingLength |= (b & 127) << Offset;
}
// Variable part:
switch (Result.ControlPacketType)
{
case MqttControlPacketType.CONNECT:
case MqttControlPacketType.CONNACK:
case MqttControlPacketType.PINGREQ:
case MqttControlPacketType.PINGRESP:
case MqttControlPacketType.DISCONNECT:
case MqttControlPacketType.PUBLISH:
default:
Result.PacketIdentifier = 0;
break;
case MqttControlPacketType.PUBACK:
case MqttControlPacketType.PUBREC:
case MqttControlPacketType.PUBREL:
case MqttControlPacketType.PUBCOMP:
case MqttControlPacketType.SUBSCRIBE:
case MqttControlPacketType.SUBACK:
case MqttControlPacketType.UNSUBSCRIBE:
case MqttControlPacketType.UNSUBACK:
Result.PacketIdentifier = Input.ReadByte();
Result.PacketIdentifier <<= 8;
Result.PacketIdentifier |= Input.ReadByte();
Result.RemainingLength -= 2;
break;
}
return(Result);
}
private async Task <bool> ProcessInputPacket()
{
try
{
BinaryInput Packet = new BinaryInput(this.inputPacket);
MqttHeader Header = MqttHeader.Parse(Packet);
switch (Header.ControlPacketType)
{
case MqttControlPacketType.CONNECT:
default:
throw new Exception("Received command from server that is not handled: " + Header.ControlPacketType.ToString());
case MqttControlPacketType.CONNACK:
bool SessionPresent = (Packet.ReadByte() & 1) != 0;
byte ReturnCode = Packet.ReadByte();
try
{
switch (ReturnCode)
{
case 0:
this.State = MqttState.Connected;
this.nextPing = DateTime.Now.AddMilliseconds(this.keepAliveSeconds * 500);
break;
case 1:
throw new IOException("Connection Refused, unacceptable protocol version.");
case 2:
throw new IOException("Connection Refused, identifier rejected.");
case 3:
throw new IOException("Connection Refused, Server unavailable.");
case 4:
throw new IOException("Connection Refused, bad user name or password.");
case 5:
throw new IOException("Connection Refused, not authorized.");
default:
throw new IOException("Unrecognized error code returned: " + ReturnCode.ToString());
}
}
catch (Exception ex)
{
await this.ConnectionError(this, ex);
this.DisposeClient();
return(false);
}
break;
case MqttControlPacketType.PINGREQ:
await this.PINGRESP();
break;
case MqttControlPacketType.PINGRESP:
EventHandlerAsync h = this.OnPingResponse;
if (h != null)
{
try
{
await h(this, new EventArgs());
}
catch (Exception ex)
{
this.Exception(ex);
Log.Critical(ex);
}
}
break;
case MqttControlPacketType.PUBLISH:
string Topic = Packet.ReadString();
if (Header.QualityOfService > MqttQualityOfService.AtMostOnce)
{
Header.PacketIdentifier = Packet.ReadUInt16();
}
else
{
Header.PacketIdentifier = 0;
}
int c = Packet.BytesLeft;
byte[] Data = Packet.ReadBytes(c);
MqttContent Content = new MqttContent(Header, Topic, Data);
switch (Header.QualityOfService)
{
case MqttQualityOfService.AtMostOnce:
await this.ContentReceived(Content);
break;
case MqttQualityOfService.AtLeastOnce:
await this.PUBACK(Header.PacketIdentifier);
await this.ContentReceived(Content);
break;
case MqttQualityOfService.ExactlyOnce:
lock (this.synchObj)
{
this.contentCache[Header.PacketIdentifier] = Content;
}
await this.PUBREC(Header.PacketIdentifier);
break;
}
break;
case MqttControlPacketType.PUBACK:
this.PacketDelivered(Header.PacketIdentifier);
PacketAcknowledgedEventHandler h2 = this.OnPublished;
if (h2 != null)
{
try
{
await h2(this, Header.PacketIdentifier);
}
catch (Exception ex)
{
this.Exception(ex);
}
}
break;
case MqttControlPacketType.PUBREC:
this.PacketDelivered(Header.PacketIdentifier);
await this.PUBREL(Header.PacketIdentifier);
break;
case MqttControlPacketType.PUBREL:
lock (this.synchObj)
{
if (this.contentCache.TryGetValue(Header.PacketIdentifier, out Content))
{
this.contentCache.Remove(Header.PacketIdentifier);
}
else
{
Content = null;
}
}
await this.PUBCOMP(Header.PacketIdentifier);
if (Content != null)
{
await this.ContentReceived(Content);
}
break;
case MqttControlPacketType.PUBCOMP:
this.PacketDelivered(Header.PacketIdentifier);
h2 = this.OnPublished;
if (h2 != null)
{
try
{
await h2(this, Header.PacketIdentifier);
}
catch (Exception ex)
{
this.Exception(ex);
}
}
break;
case MqttControlPacketType.SUBACK:
this.PacketDelivered(Header.PacketIdentifier);
h2 = this.OnSubscribed;
if (h2 != null)
{
try
{
await h2(this, Header.PacketIdentifier);
}
catch (Exception ex)
{
this.Exception(ex);
}
}
break;
case MqttControlPacketType.UNSUBACK:
this.PacketDelivered(Header.PacketIdentifier);
h2 = this.OnUnsubscribed;
if (h2 != null)
{
try
{
await h2(this, Header.PacketIdentifier);
}
catch (Exception ex)
{
this.Exception(ex);
}
}
break;
}
}
catch (Exception ex)
{
await this.Error(ex);
}
return(true);
}
/// <summary>
/// Information about content received from the MQTT server.
/// </summary>
/// <param name="Header">MQTT Header</param>
/// <param name="Topic">Topic</param>
/// <param name="Data">Binary Data</param>
public MqttContent(MqttHeader Header, string Topic, byte[] Data)
{
this.header = Header;
this.topic = Topic;
this.data = Data;
}
