Example #1
0
        private static MqttBasePacket DecodeConnectPacket(IMqttPacketBodyReader body)
        {
            ThrowIfBodyIsEmpty(body);

            var packet = new MqttConnectPacket();

            var protocolName    = body.ReadStringWithLengthPrefix();
            var protocolVersion = body.ReadByte();

            if (protocolName != "MQTT" && protocolVersion != 5)
            {
                throw new MqttProtocolViolationException("MQTT protocol name and version do not match MQTT v5.");
            }

            var connectFlags = body.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.WillMessage = new MqttApplicationMessage
                {
                    QualityOfServiceLevel = (MqttQualityOfServiceLevel)willMessageQoS,
                    Retain = willMessageRetainFlag
                };
            }

            packet.KeepAlivePeriod = body.ReadTwoByteInteger();

            var propertiesReader = new MqttV500PropertiesReader(body);

            while (propertiesReader.MoveNext())
            {
                if (packet.Properties == null)
                {
                    packet.Properties = new MqttConnectPacketProperties();
                }

                if (propertiesReader.CurrentPropertyId == MqttPropertyId.SessionExpiryInterval)
                {
                    packet.Properties.SessionExpiryInterval = propertiesReader.ReadSessionExpiryInterval();
                }
                else if (propertiesReader.CurrentPropertyId == MqttPropertyId.AuthenticationMethod)
                {
                    packet.Properties.AuthenticationMethod = propertiesReader.ReadAuthenticationMethod();
                }
                else if (propertiesReader.CurrentPropertyId == MqttPropertyId.AuthenticationData)
                {
                    packet.Properties.AuthenticationData = propertiesReader.ReadAuthenticationData();
                }
                else if (propertiesReader.CurrentPropertyId == MqttPropertyId.ReceiveMaximum)
                {
                    packet.Properties.ReceiveMaximum = propertiesReader.ReadReceiveMaximum();
                }
                else if (propertiesReader.CurrentPropertyId == MqttPropertyId.TopicAliasMaximum)
                {
                    packet.Properties.TopicAliasMaximum = propertiesReader.ReadTopicAliasMaximum();
                }
                else if (propertiesReader.CurrentPropertyId == MqttPropertyId.MaximumPacketSize)
                {
                    packet.Properties.MaximumPacketSize = propertiesReader.ReadMaximumPacketSize();
                }
                else if (propertiesReader.CurrentPropertyId == MqttPropertyId.RequestResponseInformation)
                {
                    packet.Properties.RequestResponseInformation = propertiesReader.RequestResponseInformation();
                }
                else if (propertiesReader.CurrentPropertyId == MqttPropertyId.RequestProblemInformation)
                {
                    packet.Properties.RequestProblemInformation = propertiesReader.RequestProblemInformation();
                }
                else if (propertiesReader.CurrentPropertyId == MqttPropertyId.UserProperty)
                {
                    if (packet.Properties.UserProperties == null)
                    {
                        packet.Properties.UserProperties = new List <MqttUserProperty>();
                    }

                    propertiesReader.AddUserPropertyTo(packet.Properties.UserProperties);
                }
                else
                {
                    propertiesReader.ThrowInvalidPropertyIdException(typeof(MqttConnectPacket));
                }
            }

            packet.ClientId = body.ReadStringWithLengthPrefix();

            if (packet.WillMessage != null)
            {
                var willPropertiesReader = new MqttV500PropertiesReader(body);

                while (willPropertiesReader.MoveNext())
                {
                    if (willPropertiesReader.CurrentPropertyId == MqttPropertyId.PayloadFormatIndicator)
                    {
                        packet.WillMessage.PayloadFormatIndicator = propertiesReader.ReadPayloadFormatIndicator();
                    }
                    else if (willPropertiesReader.CurrentPropertyId == MqttPropertyId.MessageExpiryInterval)
                    {
                        packet.WillMessage.MessageExpiryInterval = propertiesReader.ReadMessageExpiryInterval();
                    }
                    else if (willPropertiesReader.CurrentPropertyId == MqttPropertyId.TopicAlias)
                    {
                        packet.WillMessage.TopicAlias = propertiesReader.ReadTopicAlias();
                    }
                    else if (willPropertiesReader.CurrentPropertyId == MqttPropertyId.ResponseTopic)
                    {
                        packet.WillMessage.ResponseTopic = propertiesReader.ReadResponseTopic();
                    }
                    else if (willPropertiesReader.CurrentPropertyId == MqttPropertyId.CorrelationData)
                    {
                        packet.WillMessage.CorrelationData = propertiesReader.ReadCorrelationData();
                    }
                    else if (willPropertiesReader.CurrentPropertyId == MqttPropertyId.SubscriptionIdentifier)
                    {
                        if (packet.WillMessage.SubscriptionIdentifiers == null)
                        {
                            packet.WillMessage.SubscriptionIdentifiers = new List <uint>();
                        }

                        packet.WillMessage.SubscriptionIdentifiers.Add(propertiesReader.ReadSubscriptionIdentifier());
                    }
                    else if (willPropertiesReader.CurrentPropertyId == MqttPropertyId.ContentType)
                    {
                        packet.WillMessage.ContentType = propertiesReader.ReadContentType();
                    }
                    else if (willPropertiesReader.CurrentPropertyId == MqttPropertyId.WillDelayInterval)
                    {
                        // This is a special case!
                        packet.Properties.WillDelayInterval = propertiesReader.ReadWillDelayInterval();
                    }
                    else if (willPropertiesReader.CurrentPropertyId == MqttPropertyId.UserProperty)
                    {
                        if (packet.WillMessage.UserProperties == null)
                        {
                            packet.WillMessage.UserProperties = new List <MqttUserProperty>();
                        }

                        propertiesReader.AddUserPropertyTo(packet.Properties.UserProperties);
                    }
                    else
                    {
                        propertiesReader.ThrowInvalidPropertyIdException(typeof(MqttPublishPacket));
                    }
                }

                packet.WillMessage.Topic   = body.ReadStringWithLengthPrefix();
                packet.WillMessage.Payload = body.ReadWithLengthPrefix();
            }

            if (usernameFlag)
            {
                packet.Username = body.ReadStringWithLengthPrefix();
            }

            if (passwordFlag)
            {
                packet.Password = body.ReadWithLengthPrefix();
            }

            return(packet);
        }
Example #2
0
        private static MqttBasePacket DecodePublishPacket(byte header, IMqttPacketBodyReader body)
        {
            ThrowIfBodyIsEmpty(body);

            var retain = (header & 1) > 0;
            var qos    = (MqttQualityOfServiceLevel)(header >> 1 & 3);
            var dup    = (header >> 3 & 1) > 0;

            var packet = new MqttPublishPacket
            {
                Topic  = body.ReadStringWithLengthPrefix(),
                Retain = retain,
                QualityOfServiceLevel = qos,
                Dup = dup
            };

            if (qos > 0)
            {
                packet.PacketIdentifier = body.ReadTwoByteInteger();
            }

            var propertiesReader = new MqttV500PropertiesReader(body);

            while (propertiesReader.MoveNext())
            {
                if (packet.Properties == null)
                {
                    packet.Properties = new MqttPublishPacketProperties();
                }

                if (propertiesReader.CurrentPropertyId == MqttPropertyId.PayloadFormatIndicator)
                {
                    packet.Properties.PayloadFormatIndicator = propertiesReader.ReadPayloadFormatIndicator();
                }
                else if (propertiesReader.CurrentPropertyId == MqttPropertyId.MessageExpiryInterval)
                {
                    packet.Properties.MessageExpiryInterval = propertiesReader.ReadMessageExpiryInterval();
                }
                else if (propertiesReader.CurrentPropertyId == MqttPropertyId.TopicAlias)
                {
                    packet.Properties.TopicAlias = propertiesReader.ReadTopicAlias();
                }
                else if (propertiesReader.CurrentPropertyId == MqttPropertyId.ResponseTopic)
                {
                    packet.Properties.ResponseTopic = propertiesReader.ReadResponseTopic();
                }
                else if (propertiesReader.CurrentPropertyId == MqttPropertyId.CorrelationData)
                {
                    packet.Properties.CorrelationData = propertiesReader.ReadCorrelationData();
                }
                else if (propertiesReader.CurrentPropertyId == MqttPropertyId.SubscriptionIdentifier)
                {
                    if (packet.Properties.SubscriptionIdentifiers == null)
                    {
                        packet.Properties.SubscriptionIdentifiers = new List <uint>();
                    }

                    packet.Properties.SubscriptionIdentifiers.Add(propertiesReader.ReadSubscriptionIdentifier());
                }
                else if (propertiesReader.CurrentPropertyId == MqttPropertyId.ContentType)
                {
                    packet.Properties.ContentType = propertiesReader.ReadContentType();
                }
                else if (propertiesReader.CurrentPropertyId == MqttPropertyId.UserProperty)
                {
                    if (packet.Properties.UserProperties == null)
                    {
                        packet.Properties.UserProperties = new List <MqttUserProperty>();
                    }

                    propertiesReader.AddUserPropertyTo(packet.Properties.UserProperties);
                }
                else
                {
                    propertiesReader.ThrowInvalidPropertyIdException(typeof(MqttPublishPacket));
                }
            }

            if (!body.EndOfStream)
            {
                packet.Payload = body.ReadRemainingData();
            }

            return(packet);
        }