87 lines
2.8 KiB
C#
87 lines
2.8 KiB
C#
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/*
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Copyright (c) 2013, 2014 Paolo Patierno
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All rights reserved. This program and the accompanying materials
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are made available under the terms of the Eclipse Public License v1.0
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and Eclipse Distribution License v1.0 which accompany this distribution.
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The Eclipse Public License is available at
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http://www.eclipse.org/legal/epl-v10.html
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and the Eclipse Distribution License is available at
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http://www.eclipse.org/org/documents/edl-v10.php.
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Contributors:
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Paolo Patierno - initial API and implementation and/or initial documentation
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*/
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using uPLibrary.Networking.M2Mqtt.Exceptions;
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namespace uPLibrary.Networking.M2Mqtt.Messages
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{
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/// <summary>
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/// Class for PINGREQ message from client to broker
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/// </summary>
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public class MqttMsgPingReq : MqttMsgBase
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{
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/// <summary>
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/// Constructor
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/// </summary>
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public MqttMsgPingReq()
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{
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this.type = MQTT_MSG_PINGREQ_TYPE;
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}
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public override byte[] GetBytes(byte protocolVersion)
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{
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byte[] buffer = new byte[2];
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int index = 0;
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// first fixed header byte
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if (protocolVersion == MqttMsgConnect.PROTOCOL_VERSION_V3_1_1)
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buffer[index++] = (MQTT_MSG_PINGREQ_TYPE << MSG_TYPE_OFFSET) | MQTT_MSG_PINGREQ_FLAG_BITS; // [v.3.1.1]
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else
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buffer[index++] = (MQTT_MSG_PINGREQ_TYPE << MSG_TYPE_OFFSET);
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buffer[index++] = 0x00;
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return buffer;
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}
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/// <summary>
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/// Parse bytes for a PINGREQ message
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/// </summary>
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/// <param name="fixedHeaderFirstByte">First fixed header byte</param>
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/// <param name="protocolVersion">Protocol Version</param>
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/// <param name="channel">Channel connected to the broker</param>
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/// <returns>PINGREQ message instance</returns>
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public static MqttMsgPingReq Parse(byte fixedHeaderFirstByte, byte protocolVersion, IMqttNetworkChannel channel)
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{
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MqttMsgPingReq msg = new MqttMsgPingReq();
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if (protocolVersion == MqttMsgConnect.PROTOCOL_VERSION_V3_1_1)
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{
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// [v3.1.1] check flag bits
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if ((fixedHeaderFirstByte & MSG_FLAG_BITS_MASK) != MQTT_MSG_PINGREQ_FLAG_BITS)
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throw new MqttClientException(MqttClientErrorCode.InvalidFlagBits);
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}
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// already know remaininglength is zero (MQTT specification),
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// so it isn't necessary to read other data from socket
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int remainingLength = MqttMsgBase.decodeRemainingLength(channel);
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return msg;
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}
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public override string ToString()
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{
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#if TRACE
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return this.GetTraceString(
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"PINGREQ",
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null,
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null);
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#else
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return base.ToString();
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#endif
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}
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}
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}
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