/*
M2Mqtt - MQTT Client Library for .Net
Copyright (c) 2014, Paolo Patierno, All rights reserved.

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3.0 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library.
*/


namespace uPLibrary.Networking.M2Mqtt.Messages
{
    /// <summary>
    /// Class for PINGREQ message from client to broker
    /// </summary>
    public class MqttMsgPingReq : MqttMsgBase
    {
        /// <summary>
        /// Constructor
        /// </summary>
        public MqttMsgPingReq()
        {
            this.type = MQTT_MSG_PINGREQ_TYPE;
        }

        public override byte[] GetBytes()
        {
            byte[] buffer = new byte[2];
            int index = 0;

            // first fixed header byte
            buffer[index++] = (MQTT_MSG_PINGREQ_TYPE << MSG_TYPE_OFFSET);
            buffer[index++] = 0x00;

            return buffer;
        }

        /// <summary>
        /// Parse bytes for a PINGREQ message
        /// </summary>
        /// <param name="fixedHeaderFirstByte">First fixed header byte</param>
        /// <param name="channel">Channel connected to the broker</param>
        /// <returns>PINGREQ message instance</returns>
        public static MqttMsgPingReq Parse(byte fixedHeaderFirstByte, IMqttNetworkChannel channel)
        {
            MqttMsgPingReq msg = new MqttMsgPingReq();

            // already know remaininglength is zero (MQTT specification),
            // so it isn't necessary to read other data from socket
            int remainingLength = MqttMsgBase.decodeRemainingLength(channel);

            return msg;
        }
    }
}