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); }
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> DeserializeSubAck(MqttPacketReader reader) { var packet = new MqttSubAckPacket { PacketIdentifier = await reader.ReadRemainingDataUShortAsync() }; while (!reader.EndOfRemainingData) { packet.SubscribeReturnCodes.Add((MqttSubscribeReturnCode)await reader.ReadRemainingDataByteAsync()); } return(packet); }
private async Task <MqttBasePacket> DeserializeUnsubscribeAsync(MqttPacketReader reader) { var packet = new MqttUnsubscribePacket { PacketIdentifier = await reader.ReadRemainingDataUShortAsync(), }; while (!reader.EndOfRemainingData) { packet.TopicFilters.Add(await reader.ReadRemainingDataStringWithLengthPrefixAsync()); } return(packet); }
private static async Task <MqttBasePacket> DeserializeSubscribeAsync(MqttPacketReader reader) { var packet = new MqttSubscribePacket { PacketIdentifier = await reader.ReadRemainingDataUShortAsync(), }; while (!reader.EndOfRemainingData) { packet.TopicFilters.Add(new TopicFilter( await reader.ReadRemainingDataStringWithLengthPrefixAsync(), (MqttQualityOfServiceLevel)await reader.ReadRemainingDataByteAsync())); } return(packet); }
public async Task <MqttBasePacket> DeserializeAsync(IMqttCommunicationChannel source) { if (source == null) { throw new ArgumentNullException(nameof(source)); } using (var mqttPacketReader = new MqttPacketReader(source)) { await mqttPacketReader.ReadToEndAsync(); switch (mqttPacketReader.ControlPacketType) { case MqttControlPacketType.Connect: { return(await DeserializeConnectAsync(mqttPacketReader)); } case MqttControlPacketType.ConnAck: { return(await DeserializeConnAck(mqttPacketReader)); } case MqttControlPacketType.Disconnect: { return(new MqttDisconnectPacket()); } case MqttControlPacketType.Publish: { return(await DeserializePublishAsync(mqttPacketReader)); } case MqttControlPacketType.PubAck: { return(new MqttPubAckPacket { PacketIdentifier = await mqttPacketReader.ReadRemainingDataUShortAsync() }); } case MqttControlPacketType.PubRec: { return(new MqttPubRecPacket { PacketIdentifier = await mqttPacketReader.ReadRemainingDataUShortAsync() }); } case MqttControlPacketType.PubRel: { return(new MqttPubRelPacket { PacketIdentifier = await mqttPacketReader.ReadRemainingDataUShortAsync() }); } case MqttControlPacketType.PubComp: { return(new MqttPubCompPacket { PacketIdentifier = await mqttPacketReader.ReadRemainingDataUShortAsync() }); } case MqttControlPacketType.PingReq: { return(new MqttPingReqPacket()); } case MqttControlPacketType.PingResp: { return(new MqttPingRespPacket()); } case MqttControlPacketType.Subscribe: { return(await DeserializeSubscribeAsync(mqttPacketReader)); } case MqttControlPacketType.SubAck: { return(await DeserializeSubAck(mqttPacketReader)); } case MqttControlPacketType.Unsubscibe: { return(await DeserializeUnsubscribeAsync(mqttPacketReader)); } case MqttControlPacketType.UnsubAck: { return(new MqttUnsubAckPacket { PacketIdentifier = await mqttPacketReader.ReadRemainingDataUShortAsync() }); } default: { throw new MqttProtocolViolationException($"Packet type ({(int)mqttPacketReader.ControlPacketType}) not supported."); } } } }