private static async Task <MqttBasePacket> DeserializeConnectAsync(MqttPacketReader reader)
{
await reader.ReadRemainingDataAsync(2); // Skip 2 bytes
var protocolName = await reader.ReadRemainingDataAsync(4);
if (Encoding.UTF8.GetString(protocolName, 0, protocolName.Length) != "MQTT")
{
throw new MqttProtocolViolationException("Protocol name is not 'MQTT'.");
}
var protocolLevel = await reader.ReadRemainingDataByteAsync();
var connectFlags = await reader.ReadRemainingDataByteAsync();
var connectFlagsReader = new ByteReader(connectFlags);
connectFlagsReader.Read(); // Reserved.
var packet = new MqttConnectPacket
{
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 = await reader.ReadRemainingDataUShortAsync();
packet.ClientId = await reader.ReadRemainingDataStringWithLengthPrefixAsync();
if (willFlag)
{
packet.WillMessage = new MqttApplicationMessage(
await reader.ReadRemainingDataStringWithLengthPrefixAsync(),
await reader.ReadRemainingDataWithLengthPrefixAsync(),
(MqttQualityOfServiceLevel)willQoS,
willRetain);
}
if (usernameFlag)
{
packet.Username = await reader.ReadRemainingDataStringWithLengthPrefixAsync();
}
if (passwordFlag)
{
packet.Password = await reader.ReadRemainingDataStringWithLengthPrefixAsync();
}
ValidateConnectPacket(packet);
return(packet);
}
private async Task <MqttBasePacket> DeserializePublishAsync(MqttPacketReader reader)
{
var fixedHeader = new ByteReader(reader.FixedHeader);
var retain = fixedHeader.Read();
var qualityOfServiceLevel = (MqttQualityOfServiceLevel)fixedHeader.Read(2);
var dup = fixedHeader.Read();
var topic = await reader.ReadRemainingDataStringWithLengthPrefixAsync();
ushort packetIdentifier = 0;
if (qualityOfServiceLevel > MqttQualityOfServiceLevel.AtMostOnce)
{
packetIdentifier = await reader.ReadRemainingDataUShortAsync();
}
var packet = new MqttPublishPacket
{
Retain = retain,
QualityOfServiceLevel = qualityOfServiceLevel,
Dup = dup,
Topic = topic,
Payload = await reader.ReadRemainingDataAsync(),
PacketIdentifier = packetIdentifier
};
return(packet);
}