/// <summary>
/// Constructor
/// </summary>
/// <param name="connact">CONNECT message received from client</param>
public ConnectionOpenedEventArgs(MqttMsgConnack connact)
{
Message = connact;
}
/// <summary>
/// Parse bytes for a CONNACK message
/// </summary>
/// <param name="fixedHeaderFirstByte">First fixed header byte</param>
/// <param name="protocolVersion">Protocol Version</param>
/// <param name="channel">Channel connected to the broker</param>
/// <returns>CONNACK message instance</returns>
public static MqttMsgConnack Parse(byte fixedHeaderFirstByte, MqttProtocolVersion protocolVersion, IMqttNetworkChannel channel)
{
byte[] buffer;
int index = 0;
MqttMsgConnack msg = new MqttMsgConnack();
if ((protocolVersion == MqttProtocolVersion.Version_3_1_1) || (protocolVersion == MqttProtocolVersion.Version_5))
{
// [v3.1.1] check flag bits
if ((fixedHeaderFirstByte & MSG_FLAG_BITS_MASK) != MQTT_MSG_CONNACK_FLAG_BITS)
{
throw new MqttClientException(MqttClientErrorCode.InvalidFlagBits);
}
}
// get remaining length and allocate buffer
int remainingLength = DecodeVariableByte(channel);
buffer = new byte[remainingLength];
// read bytes from socket...
channel.Receive(buffer);
if ((protocolVersion == MqttProtocolVersion.Version_3_1_1) || (protocolVersion == MqttProtocolVersion.Version_5))
{
// [v3.1.1] ... set session present flag ...
msg.SessionPresent = (buffer[index++] & SESSION_PRESENT_FLAG_MASK) != 0x00;
}
// ...and set return code from broker
msg.ReturnCode = (MqttReasonCode)buffer[index++];
// v5.0 properties
if (protocolVersion == MqttProtocolVersion.Version_5)
{
// size of the properties
int propSize = EncodeDecodeHelper.GetPropertySize(buffer, ref index);
propSize += index;
MqttProperty prop;
while (propSize > index)
{
prop = (MqttProperty)buffer[index++];
switch (prop)
{
case MqttProperty.SessionExpiryInterval:
// 4 bytes
msg.SessionExpiryInterval = EncodeDecodeHelper.DecodeUint(buffer, ref index);
break;
case MqttProperty.ReceiveMaximum:
// 2 bytes
msg.ReceiveMaximum = (ushort)(buffer[index++] << 8);
msg.ReceiveMaximum |= buffer[index++];
break;
case MqttProperty.MaximumQoS:
msg.MaximumQoS = buffer[index++] != 0;
break;
case MqttProperty.RetainAvailable:
msg.RetainAvailable = buffer[index++] != 0;
break;
case MqttProperty.MaximumPacketSize:
// 4 bytes
msg.MaximumPacketSize = EncodeDecodeHelper.DecodeUint(buffer, ref index);
break;
case MqttProperty.AssignedClientIdentifier:
// UTF8 encoded
msg.AssignedClientIdentifier = EncodeDecodeHelper.GetUTF8FromBuffer(buffer, ref index);
break;
case MqttProperty.TopicAliasMaximum:
// 2 bytes
msg.TopicAliasMaximum = (ushort)(buffer[index++] << 8);
msg.TopicAliasMaximum |= buffer[index++];
break;
case MqttProperty.ReasonString:
// UTF8 encoded
msg.Reason = EncodeDecodeHelper.GetUTF8FromBuffer(buffer, ref index);
break;
case MqttProperty.UserProperty:
// UTF8 key value encoding, so 2 strings in a raw
string key = EncodeDecodeHelper.GetUTF8FromBuffer(buffer, ref index);
string value = EncodeDecodeHelper.GetUTF8FromBuffer(buffer, ref index);
msg.UserProperties.Add(new UserProperty(key, value));
break;
case MqttProperty.WildcardSubscriptionAvailable:
msg.WildcardSubscriptionAvailable = buffer[index++] != 0;
break;
case MqttProperty.SubscriptionIdentifierAvailable:
msg.SubscriptionIdentifiersAvailable = buffer[index++] != 0;
break;
case MqttProperty.SharedSubscriptionAvailable:
msg.SharedSubscriptionAvailable = buffer[index++] != 0;
break;
case MqttProperty.ServerKeepAlive:
// 2 bytes
msg.ServerKeepAlive = (ushort)(buffer[index++] << 8);
msg.ServerKeepAlive |= buffer[index++];
break;
case MqttProperty.ResponseInformation:
// UTF8 encoded
msg.ResponseInformation = EncodeDecodeHelper.GetUTF8FromBuffer(buffer, ref index);
break;
case MqttProperty.ServerReference:
// UTF8 encoded
msg.ServerReference = EncodeDecodeHelper.GetUTF8FromBuffer(buffer, ref index);
break;
case MqttProperty.AuthenticationMethod:
// UTF8 encoded
msg.AuthenticationMethod = EncodeDecodeHelper.GetUTF8FromBuffer(buffer, ref index);
break;
case MqttProperty.AuthenticationData:
// byte[]
int length = ((buffer[index++] << 8) & 0xFF00);
length |= buffer[index++];
msg.AuthenticationData = new byte[length];
Array.Copy(buffer, index, msg.AuthenticationData, 0, length);
index += length;
break;
default:
// non supported property
index = propSize;
break;
}
}
}
return(msg);
}
