using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using uPLibrary.Networking.M2Mqtt.Exceptions;
namespace uPLibrary.Networking.M2Mqtt.Messages
{
///
/// Class for DISCONNECT message from client to broker
///
public class MqttMsgDisconnect : MqttMsgBase
{
///
/// Constructor
///
public MqttMsgDisconnect()
{
this.type = MQTT_MSG_DISCONNECT_TYPE;
}
///
/// Parse bytes for a DISCONNECT message
///
/// First fixed header byte
/// Protocol Version
/// Channel connected to the broker
/// DISCONNECT message instance
public static MqttMsgDisconnect Parse(byte fixedHeaderFirstByte, byte protocolVersion, IMqttNetworkChannel channel)
{
MqttMsgDisconnect msg = new MqttMsgDisconnect();
if (protocolVersion == MqttMsgConnect.PROTOCOL_VERSION_V3_1_1)
{
// [v3.1.1] check flag bits
if ((fixedHeaderFirstByte & MSG_FLAG_BITS_MASK) != MQTT_MSG_DISCONNECT_FLAG_BITS)
throw new MqttClientException(MqttClientErrorCode.InvalidFlagBits);
}
// get remaining length and allocate buffer
int remainingLength = MqttMsgBase.decodeRemainingLength(channel);
// NOTE : remainingLength must be 0
return msg;
}
public override byte[] GetBytes(byte protocolVersion)
{
byte[] buffer = new byte[2];
int index = 0;
// first fixed header byte
if (protocolVersion == MqttMsgConnect.PROTOCOL_VERSION_V3_1_1)
buffer[index++] = (MQTT_MSG_DISCONNECT_TYPE << MSG_TYPE_OFFSET) | MQTT_MSG_DISCONNECT_FLAG_BITS; // [v.3.1.1]
else
buffer[index++] = (MQTT_MSG_DISCONNECT_TYPE << MSG_TYPE_OFFSET);
buffer[index++] = 0x00;
return buffer;
}
public override string ToString()
{
#if TRACE
return this.GetTraceString(
"DISCONNECT",
null,
null);
#else
return base.ToString();
#endif
}
}
}