MqttPacket DecodeConnectPacket(ArraySegment <byte> body)
{
ThrowIfBodyIsEmpty(body);
_bufferReader.SetBuffer(body.Array, body.Offset, body.Count);
var packet = new MqttConnectPacket
{
// If the Request Problem Information is absent, the value of 1 is used.
RequestProblemInformation = true
};
var protocolName = _bufferReader.ReadString();
var protocolVersion = _bufferReader.ReadByte();
if (protocolName != "MQTT" && protocolVersion != 5)
{
throw new MqttProtocolViolationException("MQTT protocol name and version do not match MQTT v5.");
}
var connectFlags = _bufferReader.ReadByte();
var cleanSessionFlag = (connectFlags & 0x02) > 0;
var willMessageFlag = (connectFlags & 0x04) > 0;
var willMessageQoS = (byte)((connectFlags >> 3) & 3);
var willMessageRetainFlag = (connectFlags & 0x20) > 0;
var passwordFlag = (connectFlags & 0x40) > 0;
var usernameFlag = (connectFlags & 0x80) > 0;
packet.CleanSession = cleanSessionFlag;
if (willMessageFlag)
{
packet.WillFlag = true;
packet.WillQoS = (MqttQualityOfServiceLevel)willMessageQoS;
packet.WillRetain = willMessageRetainFlag;
}
packet.KeepAlivePeriod = _bufferReader.ReadTwoByteInteger();
var propertiesReader = new MqttV5PropertiesReader(_bufferReader);
while (propertiesReader.MoveNext())
{
if (propertiesReader.CurrentPropertyId == MqttPropertyId.SessionExpiryInterval)
{
packet.SessionExpiryInterval = propertiesReader.ReadSessionExpiryInterval();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.AuthenticationMethod)
{
packet.AuthenticationMethod = propertiesReader.ReadAuthenticationMethod();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.AuthenticationData)
{
packet.AuthenticationData = propertiesReader.ReadAuthenticationData();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.ReceiveMaximum)
{
packet.ReceiveMaximum = propertiesReader.ReadReceiveMaximum();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.TopicAliasMaximum)
{
packet.TopicAliasMaximum = propertiesReader.ReadTopicAliasMaximum();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.MaximumPacketSize)
{
packet.MaximumPacketSize = propertiesReader.ReadMaximumPacketSize();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.RequestResponseInformation)
{
packet.RequestResponseInformation = propertiesReader.RequestResponseInformation();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.RequestProblemInformation)
{
packet.RequestProblemInformation = propertiesReader.RequestProblemInformation();
}
else
{
propertiesReader.ThrowInvalidPropertyIdException(typeof(MqttConnectPacket));
}
}
packet.UserProperties = propertiesReader.CollectedUserProperties;
packet.ClientId = _bufferReader.ReadString();
if (packet.WillFlag)
{
var willPropertiesReader = new MqttV5PropertiesReader(_bufferReader);
while (willPropertiesReader.MoveNext())
{
if (willPropertiesReader.CurrentPropertyId == MqttPropertyId.PayloadFormatIndicator)
{
packet.WillPayloadFormatIndicator = willPropertiesReader.ReadPayloadFormatIndicator();
}
else if (willPropertiesReader.CurrentPropertyId == MqttPropertyId.MessageExpiryInterval)
{
packet.WillMessageExpiryInterval = willPropertiesReader.ReadMessageExpiryInterval();
}
else if (willPropertiesReader.CurrentPropertyId == MqttPropertyId.ResponseTopic)
{
packet.WillResponseTopic = willPropertiesReader.ReadResponseTopic();
}
else if (willPropertiesReader.CurrentPropertyId == MqttPropertyId.CorrelationData)
{
packet.WillCorrelationData = willPropertiesReader.ReadCorrelationData();
}
else if (willPropertiesReader.CurrentPropertyId == MqttPropertyId.ContentType)
{
packet.WillContentType = willPropertiesReader.ReadContentType();
}
else if (willPropertiesReader.CurrentPropertyId == MqttPropertyId.WillDelayInterval)
{
packet.WillDelayInterval = willPropertiesReader.ReadWillDelayInterval();
}
else
{
willPropertiesReader.ThrowInvalidPropertyIdException(typeof(MqttPublishPacket));
}
}
packet.WillTopic = _bufferReader.ReadString();
packet.WillMessage = _bufferReader.ReadBinaryData();
packet.WillUserProperties = willPropertiesReader.CollectedUserProperties;
}
if (usernameFlag)
{
packet.Username = _bufferReader.ReadString();
}
if (passwordFlag)
{
packet.Password = _bufferReader.ReadBinaryData();
}
return(packet);
}
MqttPacket DecodeConnAckPacket(ArraySegment <byte> body)
{
ThrowIfBodyIsEmpty(body);
_bufferReader.SetBuffer(body.Array, body.Offset, body.Count);
var acknowledgeFlags = _bufferReader.ReadByte();
var packet = new MqttConnAckPacket
{
IsSessionPresent = (acknowledgeFlags & 0x1) > 0,
ReasonCode = (MqttConnectReasonCode)_bufferReader.ReadByte(),
// indicate that a feature is available.
// Set all default values according to specification. When they are missing the often
RetainAvailable = true,
SharedSubscriptionAvailable = true,
SubscriptionIdentifiersAvailable = true,
WildcardSubscriptionAvailable = true,
// Absence indicates max QoS level.
MaximumQoS = MqttQualityOfServiceLevel.ExactlyOnce
};
var propertiesReader = new MqttV5PropertiesReader(_bufferReader);
while (propertiesReader.MoveNext())
{
if (propertiesReader.CurrentPropertyId == MqttPropertyId.SessionExpiryInterval)
{
packet.SessionExpiryInterval = propertiesReader.ReadSessionExpiryInterval();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.AuthenticationMethod)
{
packet.AuthenticationMethod = propertiesReader.ReadAuthenticationMethod();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.AuthenticationData)
{
packet.AuthenticationData = propertiesReader.ReadAuthenticationData();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.RetainAvailable)
{
packet.RetainAvailable = propertiesReader.ReadRetainAvailable();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.ReceiveMaximum)
{
packet.ReceiveMaximum = propertiesReader.ReadReceiveMaximum();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.MaximumQoS)
{
packet.MaximumQoS = propertiesReader.ReadMaximumQoS();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.AssignedClientIdentifier)
{
packet.AssignedClientIdentifier = propertiesReader.ReadAssignedClientIdentifier();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.TopicAliasMaximum)
{
packet.TopicAliasMaximum = propertiesReader.ReadTopicAliasMaximum();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.ReasonString)
{
packet.ReasonString = propertiesReader.ReadReasonString();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.MaximumPacketSize)
{
packet.MaximumPacketSize = propertiesReader.ReadMaximumPacketSize();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.WildcardSubscriptionAvailable)
{
packet.WildcardSubscriptionAvailable = propertiesReader.ReadWildcardSubscriptionAvailable();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.SubscriptionIdentifiersAvailable)
{
packet.SubscriptionIdentifiersAvailable = propertiesReader.ReadSubscriptionIdentifiersAvailable();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.SharedSubscriptionAvailable)
{
packet.SharedSubscriptionAvailable = propertiesReader.ReadSharedSubscriptionAvailable();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.ServerKeepAlive)
{
packet.ServerKeepAlive = propertiesReader.ReadServerKeepAlive();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.ResponseInformation)
{
packet.ResponseInformation = propertiesReader.ReadResponseInformation();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.ServerReference)
{
packet.ServerReference = propertiesReader.ReadServerReference();
}
else
{
propertiesReader.ThrowInvalidPropertyIdException(typeof(MqttConnAckPacket));
}
}
packet.UserProperties = propertiesReader.CollectedUserProperties;
return(packet);
}