private static MqttBasePacket DeserializeConnect(MqttPacketReader reader) { reader.ReadBytes(2); // Skip 2 bytes MqttProtocolVersion protocolVersion; var protocolName = reader.ReadBytes(4); if (protocolName.SequenceEqual(ProtocolVersionV310Name)) { reader.ReadBytes(2); protocolVersion = MqttProtocolVersion.V310; } else if (protocolName.SequenceEqual(ProtocolVersionV311Name)) { protocolVersion = MqttProtocolVersion.V311; } else { throw new MqttProtocolViolationException("Protocol name is not supported."); } var protocolLevel = reader.ReadByte(); var connectFlags = reader.ReadByte(); var connectFlagsReader = new ByteReader(connectFlags); connectFlagsReader.Read(); // Reserved. var packet = new MqttConnectPacket { ProtocolVersion = protocolVersion, CleanSession = connectFlagsReader.Read() }; var willFlag = connectFlagsReader.Read(); var willQoS = connectFlagsReader.Read(2); var willRetain = connectFlagsReader.Read(); var passwordFlag = connectFlagsReader.Read(); var usernameFlag = connectFlagsReader.Read(); packet.KeepAlivePeriod = reader.ReadUInt16(); packet.ClientId = reader.ReadStringWithLengthPrefix(); if (willFlag) { packet.WillMessage = new MqttApplicationMessage( reader.ReadStringWithLengthPrefix(), reader.ReadWithLengthPrefix(), (MqttQualityOfServiceLevel)willQoS, willRetain); } if (usernameFlag) { packet.Username = reader.ReadStringWithLengthPrefix(); } if (passwordFlag) { packet.Password = reader.ReadStringWithLengthPrefix(); } ValidateConnectPacket(packet); return(packet); }